+publisher:"King Abdullah University of Science and Technology" +contributor:("Thoroddsen, Sigurdur T")

King Abdullah University of Science and Technology

1. Qiu, Shanwen. An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/245871

► In this article, we propose a new grid-free and exact solution method for computing solutions associated with an hybrid traffic flow model based on the… (more)

Subjects/Keywords: Hybrid flow model; LWR model; Grid-free numerical scheme; Bounded acceleration

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Qiu, S. (2012). An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/245871

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Qiu, Shanwen. “An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/245871.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Qiu, Shanwen. “An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration.” 2012. Web. 16 Apr 2021.

Vancouver:

Qiu S. An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/245871.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Qiu S. An Exact and Grid-free Numerical Scheme for the Hybrid Two Phase Traffic Flow Model Based on the Lighthill-Whitham-Richards Model with Bounded Acceleration. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/245871

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

2. Bahshwan, Mohanad. Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/273095

► Increasing demand for fresh water in arid and semi-arid areas, similar to the Middle East, pushed for the use of seawater desalination techniques to augment… (more)

▼ Increasing demand for fresh water in arid and semi-arid areas, similar to the Middle East, pushed for the use of seawater desalination techniques to augment freshwater. Seawater Reverse Osmosis (SWRO) is one of the techniques that have been commonly used due to its cost effectiveness. Recently, the use of Ultrafiltration (UF) was recommended as an effective pretreatment for SWRO membranes, as opposed to conventional methods (i.e. sand filtration). During UF operation, intermittent cleaning is required to remove particles and contaminants from the membrane's surface and pores. The different cleaning steps consume chemicals and portion of the product water, resulting in a decrease in the overall effectiveness of the process and hence an increase in the production cost. This research focused on increasing the plant's efficiency through optimizing the cleaning protocol without jeopardizing the effectiveness of the cleaning process. For that purpose, the design of experiment (DOE) focused on testing different combinations of these cleaning steps while all other parameters (such as filtration flux or backwash flux) remained constant. The only chemical used was NaOCI during the end of each experiment to restore the trans-membrane pressure (TMP) to its original state. Two trains of Dow™ Ultrafiltration SFP-2880 were run in parallel for this study. The first train (named UF1) was kept at the manufacturer's recommended cleaning steps and frequencies, while the second train (named UF2) was varied according to the DOE. The normalized final TMP was compared to the normalized initial TMP to measure the fouling rate of the membrane at the end of each experiment. The research was supported by laboratory analysis to investigate the cause of the error in the data by analyzing water samples collected at different locations. Visual inspection on the results from the control unit showed that the data cannot be reproduced with the current feed water quality. Statistical analysis using SAS JMP® was performed on the data obtained from UF2 determined that the error in the data was too significant, accounting for 42%. Laboratory inspection on water samples concluded that the water quality feeding to the UF membranes was worse than that of the raw water. This led to a conclusion that severe contamination occurred within the main feed tank where the water was retained before arriving to the UF modules. The type of contamination present in the feed tank is yet to be investigated. Though, frequent cleaning or flushing of the feed tank is recommended on regular basis. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Amy, Gary L. (committee member), Ghaffour, NorEddine (committee member).

Subjects/Keywords: Ultrafiltration; Cleaning; UF-SWRO; UF cleaning; Pretreatment; SWRO pretreatment

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bahshwan, M. (2012). Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/273095

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bahshwan, Mohanad. “Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/273095.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bahshwan, Mohanad. “Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water.” 2012. Web. 16 Apr 2021.

Vancouver:

Bahshwan M. Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/273095.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bahshwan M. Optimizing UF Cleaning in UF-SWRO System Using Red Sea Water. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/273095

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

3. Cevallos, Oscar R. Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/273097

► An adsorbent suitable for adsorption desalination cycles is essentially characterized by a hydrophilic and porous structure with high surface area where water molecules are adsorbed… (more)

▼ An adsorbent suitable for adsorption desalination cycles is essentially characterized by a hydrophilic and porous structure with high surface area where water molecules are adsorbed via hydrogen bonding mechanism. Silica gel type A++ possesses the highest surface area and exhibits the highest equilibrium uptake from all the silica gels available in the market, therefore being suitable for water desalination cycles; where adsorbent’s adsorption characteristics and water vapor uptake capacity are key parameters in the compactness of the system; translated as feasibility of water desalination through adsorption technologies. The adsorption characteristics of water vapor onto silica gel type A++ over a temperature range of 30 °C to 60 °C are investigated in this research. This is done using water vapor adsorption analyzer utilizing a constant volume and variable pressure method, namely the Hydrosorb-1000 instrument by Quantachrome. The experimental uptake data is studied using numerous isotherm models, i. e. the Langmuir, Tóth, generalized Dubinin-Astakhov (D-A), Dubinin-Astakhov based on pore size distribution (PSD) and Dubinin-Serpinski (D-Se) isotherm for the whole pressure range, and for a pressure range below 10 kPa, proper for desalination cycles; isotherms type V of the International Union of Pure and Applied Chemistry (IUPAC) classification were exhibited. It is observed that the D-A based on PSD and the D-Se isotherm models describe the best fitting of the experimental uptake data for desalination cycles within a regression error of 2% and 6% respectively. All isotherm models, except the D-A based on PSD, have failed to describe the obtained experimental uptake data; an empirical isotherm model is proposed by observing the behavior of Tóth and D-A isotherm models. The new empirical model describes the water adsorption onto silica gel type A++ within a regression error of 3%. This will aid to describe the advantages of silica gel type A++ for the design of adsorption desalination processes where reducing capital cost and footprint area are highly important parameters to take into account. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Ng, Kim C. (committee member), Samtaney, Ravi (committee member).

Subjects/Keywords: Adsorption; Silica gel; Isotherm model; Pore size distribution; Desalination; Dubinin Astakhov

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cevallos, O. R. (2012). Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/273097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cevallos, Oscar R. “Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/273097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cevallos, Oscar R. “Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle.” 2012. Web. 16 Apr 2021.

Vancouver:

Cevallos OR. Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/273097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cevallos OR. Adsorption Characteristics of Water and Silica Gel System for Desalination Cycle. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/273097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

4. Mansoor, Mohammad M. Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/277455

► Cavity formation resulting from the water-entry of solid objects has been the subject of extensive research owing to its practical relevance in naval, military, industrial,… (more)

▼ Cavity formation resulting from the water-entry of solid objects has been the subject of extensive research owing to its practical relevance in naval, military, industrial, sports and biological applications. The cavity formed by an impacting hydrophobic sphere normally seals at two places, one below (deep seal) and the other above the water surface (surface seal). For Froude numbers , the air flow into the resulting cavity is strong enough to suck the splash crown above the surface and disrupt the cavity dynamics before it deep seals. In this research work we eliminate surface seals by means of a novel practice of using cone splash-guards and examine the undisturbed transient cavity dynamics by impact of hydrophobic spheres for Froude numbers ranging . This enabled the measurement of extremely accurate pinch-off heights, pinch-off times, radial cavity collapse rates, and jet speeds in an extended range of Froude numbers compared to the previous work of Duclaux et al. (2007). Results in the extended regime were in remarkable agreement with the theoretical prediction of scaled pinch-off depth, and experimentally derived pinch-off time for . Furthermore, we investigated the influence of confinement on cavity formation by varying the cross-sectional area of the tank of liquid. In conjunction with surface seal elimination we observed the formation of multiple pinch-off points where a maximum of four deep seals were obtained in a sequential order for the Froude number range investigated. The presence of an elongated cavity beneath the first pinch-off point 5 resulted in evident "kinks" primarily related to the greatly diminished air pressure at the necking region caused by supersonic air flows (Gekle et al. 2010). Such flows passing through second pinch-offs were also found to choke the cavities beneath the first pinch- off depths causing radial expansion and hence disappearance of downward jets. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), El Sayed, Tamer (committee member), Marston, Jeremy (committee member).

Subjects/Keywords: Cavity; Hydrophobic; Impact; Water; Entry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mansoor, M. M. (2012). Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/277455

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mansoor, Mohammad M. “Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/277455.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mansoor, Mohammad M. “Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces.” 2012. Web. 16 Apr 2021.

Vancouver:

Mansoor MM. Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/277455.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mansoor MM. Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/277455

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

5. Cristancho, Juan. Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/277454

► The thin interface separating the inner turbulent region from the outer irrotational fluid is analyzed in a direct numerical simulation of a spatially developing turbulent… (more)

Subjects/Keywords: Interface; Mixing Layer; Statistics; Turbulence

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cristancho, J. (2012). Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/277454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cristancho, Juan. “Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/277454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cristancho, Juan. “Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer.” 2012. Web. 16 Apr 2021.

Vancouver:

Cristancho J. Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/277454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cristancho J. Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/277454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

6. Khalil, Kareem. Liquid Marbles.

Degree: Physical Science and Engineering (PSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/277453

► Granulation, the process of formation of granules from a combination of base powders and binder liquids, has been a subject of research for almost 50… (more)

▼ Granulation, the process of formation of granules from a combination of base powders and binder liquids, has been a subject of research for almost 50 years, studied extensively for its vast applications, primarily to the pharmaceutical industry sector. The principal aim of granulation is to form granules comprised of the active pharmaceutical ingredients (API’s), which have more desirable handling and flowability properties than raw powders. It is also essential to ensure an even distribution of active ingredients within a tablet with the goal of achieving time-controlled release of drugs. Due to the product-specific nature of the industry, however, data is largely empirical [1]. For example, the raw powders used can vary in size by two orders of magnitude with narrow or broad size distributions. The physical properties of the binder liquids can also vary significantly depending on the powder properties and required granule size. Some significant progress has been made to better our understanding of the overall granulation process [1] and it is widely accepted that the initial nucleation / wetting stage, when the binder liquid first wets the powders, is key to the whole process. As such, many experimental studies have been conducted in attempt to elucidate the physics of this first stage [1], with two main mechanisms being observed – classified by Ivenson [1] as the “Traditional description” and the “Modern Approach”. See Figure 1 for a graphical definition of these two mechanisms. Recent studies have focused on the latter approach [1] and a new, exciting development in this field is the Liquid Marble. This interesting formation occurs when a liquid droplet interacts with a hydrophobic (or superhydrophobic) powder. The droplet can become encased in the powder, which essentially provides a protective “shell” or “jacket” for the liquid inside [2]. The liquid inside is then isolated from contact with other solids or liquids and has some fascinating physical properties, which will be described later on. The main potential use for these liquid marbles appears to be for the formation of novel, hollow granules [3], which may have desirable properties in specific pharmaceutical applications (e.g. respiratory devices). They have also been shown to be a highly effectively means of water recovery and potentially as micro-transporters and micro-reactors [4]. However, many studies in the literature are essentially proof-of-concept approaches for applications and a systematic study of the dynamics of the marble formation and the first interactions of the liquid droplet with the powder is lacking. This is the motivation for this research project, where we aim to provide such information from an experimental study of drop impact onto hydrophobic powders with the use of high-speed imaging. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Claudel, Christian G. (committee member), Marston, Jeremy (committee member).

Subjects/Keywords: High-Speed Fluids; Micro-droplets; Hydrophobic Powder; Liquid Marbles; Impact; Rebound

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khalil, K. (2012). Liquid Marbles. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/277453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Khalil, Kareem. “Liquid Marbles.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/277453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Khalil, Kareem. “Liquid Marbles.” 2012. Web. 16 Apr 2021.

Vancouver:

Khalil K. Liquid Marbles. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/277453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Khalil K. Liquid Marbles. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/277453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

7. Kouraytem, Nadia. Effect of Wetting and Contamination of Granular Beds During Sphere Impact.

Degree: Physical Science and Engineering (PSE) Division, 2013, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/279152

► This thesis presents results from an experimental study of the impact of dense solid spheres onto granular beds. The overall aim is to further our… (more)

Subjects/Keywords: Granular; Impact; Wetting; Penetration

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kouraytem, N. (2013). Effect of Wetting and Contamination of Granular Beds During Sphere Impact. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/279152

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kouraytem, Nadia. “Effect of Wetting and Contamination of Granular Beds During Sphere Impact.” 2013. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/279152.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kouraytem, Nadia. “Effect of Wetting and Contamination of Granular Beds During Sphere Impact.” 2013. Web. 16 Apr 2021.

Vancouver:

Kouraytem N. Effect of Wetting and Contamination of Granular Beds During Sphere Impact. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2013. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/279152.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kouraytem N. Effect of Wetting and Contamination of Granular Beds During Sphere Impact. [Thesis]. King Abdullah University of Science and Technology; 2013. Available from: http://hdl.handle.net/10754/279152

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

8. Borja, Francisco J. Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2013, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/296760

► Parametric resonance is a particular type of resonance in which a parameter in a system changes with time. A particularly interesting case is when the… (more)

Subjects/Keywords: Walking droplets; Parametric Resonance; Free surface; Variable Topography; Faraday Instability

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Borja, F. J. (2013). Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/296760

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Borja, Francisco J. “Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study.” 2013. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/296760.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Borja, Francisco J. “Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study.” 2013. Web. 16 Apr 2021.

Vancouver:

Borja FJ. Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2013. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/296760.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Borja FJ. Free Surface Waves And Interacting Bouncing Droplets: A Parametric Resonance Case Study. [Thesis]. King Abdullah University of Science and Technology; 2013. Available from: http://hdl.handle.net/10754/296760

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

9. Jaber, Nizar. Higher Order Modes Excitation of Micro Cantilever Beams.

Degree: Physical Science and Engineering (PSE) Division, 2014, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/317259

► In this study, we present analytical and experimental investigation of electrically actuated micro cantilever based resonators. These devices are fabricated using polyimide and coated with… (more)

Subjects/Keywords: MEMS; MicroContilever; Electrostatic; Resonators; Modes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jaber, N. (2014). Higher Order Modes Excitation of Micro Cantilever Beams. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/317259

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jaber, Nizar. “Higher Order Modes Excitation of Micro Cantilever Beams.” 2014. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/317259.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jaber, Nizar. “Higher Order Modes Excitation of Micro Cantilever Beams.” 2014. Web. 16 Apr 2021.

Vancouver:

Jaber N. Higher Order Modes Excitation of Micro Cantilever Beams. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2014. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/317259.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jaber N. Higher Order Modes Excitation of Micro Cantilever Beams. [Thesis]. King Abdullah University of Science and Technology; 2014. Available from: http://hdl.handle.net/10754/317259

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

10. Sulaimani, Anwar Ali. Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material.

Degree: Physical Science and Engineering (PSE) Division, 2014, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/323728

► Epoxy resins are widely used materials in the industry as electrical insulators, adhesives and in aircrafts structural components because of their high mechanical stiﬀness, strength… (more)

Subjects/Keywords: Anhydride Epoxy; Water Absorption; Volume Resistivity; Dielectric Spectroscopy; Relative Permittivit

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sulaimani, A. A. (2014). Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/323728

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sulaimani, Anwar Ali. “Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material.” 2014. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/323728.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sulaimani, Anwar Ali. “Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material.” 2014. Web. 16 Apr 2021.

Vancouver:

Sulaimani AA. Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2014. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/323728.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sulaimani AA. Influence of Water Absorption on Volume Resistivity and the Dielectric Properties of Neat Epoxy Material. [Thesis]. King Abdullah University of Science and Technology; 2014. Available from: http://hdl.handle.net/10754/323728

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

11. Mansoor, Mohammad M. On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/615877

► The free-surface impact of spheres is important to several applications in the military, industry and sports such as the water-entry of torpedoes, dip-coating procedures and… (more)

▼ The free-surface impact of spheres is important to several applications in the military, industry and sports such as the water-entry of torpedoes, dip-coating procedures and slamming of boats. This two-part thesis attempts to explore this field by investigating cavity formation during the impact of spheres with deep liquid pools and cavitation in thin ultra-viscous films. Part I reports results from an experimental study on the formation of stable- streamlined and helical cavity wakes following the free-surface impact of heated Leidenfrost spheres. The Leidenfrost effect encapsulates the sphere by a vapor layer to prevent any physical contact with the surrounding liquid. This phenomenon is essential for the pacification of acoustic rippling along the cavity interface to result in a stable-streamlined cavity wake. Such a streamlined configuration experiences drag coefficients an order of magnitude lower than those acting on room temperature spheres. A striking observation is the formation of helical cavities which occur for impact Reynolds numbers Re0 ≳ 1.4 × 105 and are characterized by multiple interfacial ridges, stemming from and rotating synchronously about an evident contact line around the sphere equator. This helical configuration has 40-55% smaller overall force coefficients than those obtained in the formation of stable cavity wakes. Part II of this thesis investigates the inception of cavitation and resulting structures when a sphere collides with a solid surface covered with a layer of non-Newtonian liquid having kinematic viscosities of up to v0 = 20,000,000 cSt. The existence of shear-stress- induced cavitation during sphere approach towards the base wall (i.e. the pressurization stage) in ultra-viscous films is shown using a synchronized dual-view high-speed imaging system. In addition, cavitation by depressurization is noted for a new class of non-contact cases whereby the sphere rebounds without any prior contact with the solid wall. Horizontal shear rates calculated using particle image velocimtery (PIV) measurements reveal the apparent fluid viscosity to vary substantially as the sphere approaches and rebounds away from the base wall. A theoretical model based on the lubrication assumption is also solved for the squeeze flow in the regime identified for shear-induced cavity events to investigate the criterion for cavity inception in further detail. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Farooq, Aamir (committee member), Sun, Shuyu (committee member), Sigurdson, Lorenz (committee member).

Subjects/Keywords: Impact; Cavitation; Leidenfrost

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mansoor, M. M. (2016). On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/615877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mansoor, Mohammad M. “On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/615877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mansoor, Mohammad M. “On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films.” 2016. Web. 16 Apr 2021.

Vancouver:

Mansoor MM. On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/615877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mansoor MM. On the Impact of Spheres onto Liquid Pools and Ultra-viscous Films. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/615877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

12. Khaled, Narimane. High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/618394

► Frost formation is of a major research interest as it can affect many industrial processes. Frost appears as a thin deposit of ice crystals when… (more)

Subjects/Keywords: Super Cold; Drop Impact; Dry Ice; Crack on Cold Surface; High Speed Fluid Imaging; Spere Coatings

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khaled, N. (2016). High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/618394

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Khaled, Narimane. “High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/618394.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Khaled, Narimane. “High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface.” 2016. Web. 16 Apr 2021.

Vancouver:

Khaled N. High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/618394.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Khaled N. High-Speed Imaging of a Water Droplet Impacting a Super Cold Surface. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/618394

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

13. Wasfi, Bayan. Cetane Number of Biodiesel from Karaya Oil.

Degree: Physical Science and Engineering (PSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/623476

► Biodiesel is a renewable fuel alternative to petroleum Diesel, biodiesel has similar characteristic but with lesser exhaust emission. In this study, transesterification of Karaya oil… (more)

Subjects/Keywords: Karaya Oil; Biodiesel; Cetane Number

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wasfi, B. (2017). Cetane Number of Biodiesel from Karaya Oil. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/623476

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wasfi, Bayan. “Cetane Number of Biodiesel from Karaya Oil.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/623476.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wasfi, Bayan. “Cetane Number of Biodiesel from Karaya Oil.” 2017. Web. 16 Apr 2021.

Vancouver:

Wasfi B. Cetane Number of Biodiesel from Karaya Oil. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/623476.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wasfi B. Cetane Number of Biodiesel from Karaya Oil. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/623476

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

14. Sanchez Yanez, Aaron. An experimental study of particle-bubble interaction and attachment in flotation.

Degree: Physical Science and Engineering (PSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/625292

► The particle-bubble interaction is found in industrial applications with the purpose of selective separation of materials especially in the mining industry. The separation is achieved… (more)

Subjects/Keywords: particle; bubble; flotation; collision; Interaction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sanchez Yanez, A. (2017). An experimental study of particle-bubble interaction and attachment in flotation. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/625292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sanchez Yanez, Aaron. “An experimental study of particle-bubble interaction and attachment in flotation.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/625292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sanchez Yanez, Aaron. “An experimental study of particle-bubble interaction and attachment in flotation.” 2017. Web. 16 Apr 2021.

Vancouver:

Sanchez Yanez A. An experimental study of particle-bubble interaction and attachment in flotation. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/625292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sanchez Yanez A. An experimental study of particle-bubble interaction and attachment in flotation. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/625292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Liu, Yuan-Kai. Ground Deformation Related to Caldera Collapse and Ring-Fault Activity.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/627773

► Volcanic subsidence, caused by partial emptying of magma in the subsurface reservoir has long been observed by spaceborne radar interferometry. Monitoring long-term crustal deformation at… (more)

▼ Volcanic subsidence, caused by partial emptying of magma in the subsurface reservoir has long been observed by spaceborne radar interferometry. Monitoring long-term crustal deformation at the most notable type of volcanic subsidence, caldera, gives us insights of the spatial and hazard-related information of subsurface reservoir. Several subsiding calderas, such as volcanoes on the Galapagos islands have shown a complex ground deformation pattern, which is often composed of a broad deflation signal affecting the entire edifice and a localized subsidence signal focused within the caldera floor. Although numerical or analytical models with multiple reservoirs are proposed as the interpretation, geologically and geophysically evidenced ring structures in the subsurface are often ignored. Therefore, it is still debatable how deep mechanisms relate to the observed deformation patterns near the surface. We aim to understand what kind of activities can lead to the complex deformation. Using two complementary approaches, we study the three-dimensional geometry and kinematics of deflation processes evolving from initial subsidence to later collapse of calderas. Firstly, the analog experiments analyzed by structure-from-motion photogrammetry (SfM) and particle image velocimetry (PIV) helps us to relate the surface deformation to the in-depth structures. Secondly, the numerical modeling using boundary element method (BEM) simulates the characteristic deformation patterns caused by a sill-like source and a ring-fault. Our results show that the volcano-wide broad deflation is primarily caused by the emptying of the deep magma reservoir, whereas the localized deformation on the caldera floor is related to ring-faulting at a shallower depth. The architecture of the ring-fault to a large extent determines the deformation localization on the surface. Since series evidence for ring-faulting at several volcanoes are provided, we highlight that it is vital to include ring-fault activity in numerical or analytical deformation source formulation. Ignoring the process of ring-faulting in models by using multiple point sources for various magma reservoirs will result in erroneous, thus meaningless estimates of depth and volume change of the magmatic reservoir(s). Advisors/Committee Members: Jonsson, Sigurjon (advisor), Santamarina, Carlos (committee member), Thoroddsen, Sigurdur T (committee member).

Subjects/Keywords: caldera subsidence; overlapping deformation; anlog models; boundary element modeling; ring-faults; Interferometric synthetic aperture radar (SAR) (InSAR)

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, Y. (2018). Ground Deformation Related to Caldera Collapse and Ring-Fault Activity. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/627773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Yuan-Kai. “Ground Deformation Related to Caldera Collapse and Ring-Fault Activity.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/627773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Yuan-Kai. “Ground Deformation Related to Caldera Collapse and Ring-Fault Activity.” 2018. Web. 16 Apr 2021.

Vancouver:

Liu Y. Ground Deformation Related to Caldera Collapse and Ring-Fault Activity. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/627773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu Y. Ground Deformation Related to Caldera Collapse and Ring-Fault Activity. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/627773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

16. Al Mudraa, Sultan. Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/628064

► A High percentage of fuel consumption worldwide is in internal combustion engines which has led environmental organizations and authorities to put further pressure on the… (more)

Subjects/Keywords: VCR; BICERA; BICERE; Hydraulic piston

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al Mudraa, S. (2018). Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/628064

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al Mudraa, Sultan. “Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/628064.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al Mudraa, Sultan. “Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine.” 2018. Web. 16 Apr 2021.

Vancouver:

Al Mudraa S. Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/628064.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al Mudraa S. Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/628064

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

17. Alduraiei, Fadhilah H. Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/630120

► In this work, we report a facile and robust surface membrane modification method via a simple coating of PVDF membrane using tannic acid (TA) followed… (more)

Subjects/Keywords: Oil-in water Emulsion; superwetable; membrane

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alduraiei, F. H. (2018). Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/630120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alduraiei, Fadhilah H. “Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/630120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alduraiei, Fadhilah H. “Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions.” 2018. Web. 16 Apr 2021.

Vancouver:

Alduraiei FH. Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/630120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alduraiei FH. Superwettable Membranes for Highly Efficient Separation of Oil-in-Water Emulsions. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/630120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

18. Langley, Kenneth. Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface.

Degree: Physical Science and Engineering (PSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/660226

► Drop impacts are present in our everyday lives, from showering and washing the dishes to inkjet printing and many industrial processes, such as spray coatings… (more)

▼ Drop impacts are present in our everyday lives, from showering and washing the dishes to inkjet printing and many industrial processes, such as spray coatings and spray cooling. In many of these applications it may be undesirable to have air entrained within the drop when it impacts a surface. As a drop approaches a surface, the gas beneath the drop is unable to fully escape resulting in a rising pressure which becomes sufficient to form a dimple in the bottom center of the drop. Therefore, when the drop makes contact with the surface, it is around the perimeter of this dimple, thus entrapping a disc of air which contracts into a minute bubble. In this dissertation, we study the very early time dynamics of the formation of the central air disc under a variety of circumstances using ultra-high-speed interferometry at rates up to 5 million frames per second. We show the effects of the liquid viscosity for viscosities spanning 7 orders of magnitude, for impacts of drops onto solid surfaces or a film of the same liquid. We find that the size of the air disc is weakly dependent on the drop viscosity to the -1/9 power. We also explore the extended gliding of the drop on a less than 160 nm thick film of air. For impacts onto a solid surface, this gliding layer is rupture in multiple random locations and each localized contact wets the surface at extreme rates compared with the expected viscous-capillary velocity. For impacts onto liquid films, the localized contacts are rarely observed and the gliding layer ruptures at a uniform location. The central bubble contracts much faster than expected in this case as well. Furthermore, we study the effects of reducing the ambient air pressure discovering a compressible and rarified-gas regime wherein the drop makes a double contact with the surface. Lastly, we study the effects of nano-scale surface roughness on the central bubble and the formation of thick bands of microbubbles around the periphery of the air disc. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Samtaney, Ravi (committee member), Parsani, Matteo (committee member), Clanet, Christophe (committee member).

Subjects/Keywords: drop impact; high-speed imaging; high viscosity; microbubble; interferometry; surface roughness

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Langley, K. (2019). Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/660226

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Langley, Kenneth. “Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/660226.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Langley, Kenneth. “Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface.” 2019. Web. 16 Apr 2021.

Vancouver:

Langley K. Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/660226.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Langley K. Air Entrapment Under a Liquid Drop Impacting on to a Solid or Liquid Surface. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/660226

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

19. Ridwan, Muhammad Ghifari. Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS).

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/662802

► Slippery liquid-infused porous surfaces (SLIPS) – a new class of bio-inspired liquid-repellent surfaces – comprise arbitrarily porous architectures filled with oils that exhibit high interfacial… (more)

▼ Slippery liquid-infused porous surfaces (SLIPS) – a new class of bio-inspired liquid-repellent surfaces – comprise arbitrarily porous architectures filled with oils that exhibit high interfacial tensions to probe liquids and present ultralow contact angle hysteresis (<〖10〗^°). However, before practical technologies based on SLIPS can be designed at large-scale, a number of fundamental questions remain to be answered. For instance, depending on the sign of the spreading coefficient of the Vapor(V)-lubricant oil(O)-liquid(L) system, defined as S_(OL(V))=γ_LV-γ_LO-γ_OV>0, the lubricating layer forms a layer at the liquid-vapor interface (here, γ_LV is a liquid-vapor interfacial tension, γ_LO – liquid-oil, and γ_OV – oil-vapor). This “cloaking” of liquid drops can deplete SLIPS’ lubricant over time and contaminate the probed liquid. So far, cloaking has been investigated by contact angle goniometry and confocal microscopy, which cannot resolve films of molecular thickness and factors that govern the equilibrium thickness of those films are not entirely clear. Here, we report on the development and application of a reflective-mode SFA platform to characterize the cloaking of water droplets placed on SLIPS. A multilayer matrix method is utilized to analyze the interferometry data. Using this complementary experimental and analytical approach, we determined the thickness of the cloaking layer for the FDTS(solid)-VF-40(lubricant)-water(probe liquid)-air system to be z3= 7±1 nm. Towards deeper insights into the intermolecular and surface forces responsible for cloaking, we demonstrate that repulsive van der Waals interactions are responsible for stabilizing the cloaking film at the water-air interface. Our experimental platform and the analytical framework should facilitate investigations of other SLIPS and probe liquid systems down to the molecular-scale resolution. These findings might aid the rational design of SLIPS, e.g., for drag reduction, anti-biofouling, and anti-corrosion. In addition to investigating SLIPS, We addressed the following questions with the help of atomic force microscopy (AFM): (i) how do zwitterionic osmolytes modulate electrostatic and hydrophobic interactions in nanoscale confinement, and (ii) is it possible to have two negatively charged surfaces attract each other? Our findings are presented as appendices in this thesis. Advisors/Committee Members: Mishra, Himanshu (advisor), Nunes, Suzana Pereira (committee member), Thoroddsen, Sigurdur T (committee member).

Subjects/Keywords: Infused-liquid surfaces; Surface force apparatus; Interferometer; Cloaking phenomena; Van der Waals interaction; Hamaker constant

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ridwan, M. G. (2020). Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS). (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/662802

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ridwan, Muhammad Ghifari. “Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS).” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/662802.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ridwan, Muhammad Ghifari. “Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS).” 2020. Web. 16 Apr 2021.

Vancouver:

Ridwan MG. Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS). [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/662802.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ridwan MG. Investigating sub-10 nm-thick Cloaking Films on Sessile Water Droplets Placed on Slippery Lubricant-Infused Porous Surfaces (SLIPS). [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/662802

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

20. Wang, Yongwei. Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure.

Degree: Physical Science and Engineering (PSE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/663729

► The classical continuum mechanics, which studies the mechanical behavior of structures based on partial differential equations, shows its deficiencies when it encounters a discontinuity. Peridynamics… (more)

Subjects/Keywords: peridynamics; Local to non local coupling; fracture; Morphing function; Process zone

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, Y. (2020). Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/663729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Yongwei. “Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/663729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Yongwei. “Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure.” 2020. Web. 16 Apr 2021.

Vancouver:

Wang Y. Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/663729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang Y. Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation for Material Failure. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/663729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

21. Andrade, Cristhian F. Contact Angle Hysteresis: Implications for Fluid Flow.

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/664385

► Contact angle behavior controls the spreading, sticking, or movement of fluid droplets on top of solid substrates, and the immiscible displacement of mixed fluids in… (more)

▼ Contact angle behavior controls the spreading, sticking, or movement of fluid droplets on top of solid substrates, and the immiscible displacement of mixed fluids in porous media. Therefore, it influences applications such as oil recovery, CO2 geological storage, water transport in unsaturated soils, and DNAPL soil remediation techniques. The attraction forces and geometrical-molecular arrangement at the atomic scale define the strength of the interfacial tension that changes in response to changes in temperature, pressure, or the fluid composition within the system. Contact line behavior such as contact line pinning or depinning, microscale roughness, and changes in interfacial tensions influence advancing and receding contact angles. This study consists of a comprehensive database of published advancing and receding contact angles to understand the underlying mechanisms of contact line pinning and depinning and the implications of these phenomena on advancing and receding contact angles. Calcite experiments that investigate advancing and receding contact angle measurements as a function of ionic concentration complement the published literature. Critical results include: an advancing contact angle trend with calcite as a function of ionic concentration, a point of minimum contact angle hysteresis when brine concentrations are close to 0.1 M, and that contact angle behavior depends on cation type and the calcite surface anisotropy. Contact line pinning prevents flow and increases contact angle hysteresis. An analysis of the database suggests that the wide range of contact angle hysteresis of calcite and quartz with water results both from hydrogen bonds and microscale roughness at the surface which leads to pinned contact lines. The Jamin effect reduces significantly in calcite when the resultant injection brines have an ionic concentration close to 0.1 M. Thus, the pressure difference required to displace a non-wetting fluid for a wetting fluid reduces, and leads to enhanced recovery of trapped oil, gas or DNAPL. Advisors/Committee Members: Santamarina, Carlos (advisor), Nunes, Suzana Pereira (committee member), Thoroddsen, Sigurdur T (committee member).

Subjects/Keywords: Contact angle hysteresis; Fluid flow; Calcite; Contact line; Advancing contact angle; Receding contact angle

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Andrade, C. F. (2020). Contact Angle Hysteresis: Implications for Fluid Flow. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/664385

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Andrade, Cristhian F. “Contact Angle Hysteresis: Implications for Fluid Flow.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/664385.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Andrade, Cristhian F. “Contact Angle Hysteresis: Implications for Fluid Flow.” 2020. Web. 16 Apr 2021.

Vancouver:

Andrade CF. Contact Angle Hysteresis: Implications for Fluid Flow. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/664385.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Andrade CF. Contact Angle Hysteresis: Implications for Fluid Flow. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/664385

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

22. Zhang, Jiaming. Generation of emulsion droplets and micro-bubbles in microfluidic devices.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/618374

► Droplet-based microfluidic devices have become a preferred versatile platform for various fields in physics, chemistry and biology to manipulate small amounts of liquid samples. In… (more)

▼ Droplet-based microfluidic devices have become a preferred versatile platform for various fields in physics, chemistry and biology to manipulate small amounts of liquid samples. In addition to microdroplets, microbubbles are also needed for various pro- cesses in the food, healthcare and cosmetic industries. Polydimethylsiloxane (PDMS) soft lithography, the mainstay for fabricating microfluidic devices, usually requires the usage of expensive apparatus and a complex manufacturing procedure. In ad- dition, current methods have the limited capabilities for fabrication of microfluidic devices within three dimensional (3D) structures. Novel methods for fabrication of droplet-based microfluidic devices for the generation microdroplets and microbubbles are therefore of great interest in current research. In this thesis, we have developed several simple, rapid and low-cost methods for fabrication of microfluidic devices, especially for generation of microdroplets and mi- crobubbles. We first report an inexpensive full-glass microfluidic devices with as- sembly of glass capillaries, for generating monodisperse multiple emulsions. Different types of devices have been designed and tested and the experimental results demon- strated the robust capability of preparing monodisperse single, double, triple and multi-component emulsions. Second, we propose a similar full-glass device for generation of microbubbles, but with assembly of a much smaller nozzle of a glass capillary. Highly monodisperse microbubbles with diameter range from 3.5 to 60 microns have been successfully produced, at rates up to 40 kHz. A simple scaling law based on the capillary number and liquid-to-gas flow rate ratio, successfully predicts the bubble size. Recently, the emergent 3D printing technology provides an attractive fabrication technique, due to its simplicity and low cost. A handful of studies have already demonstrated droplet production through 3D-printed microfluidic devices. However, two-dimensional (2D) flow structures are still used and the advantage of 3D-printing technique has not been fully exploited. Therefore, we apply 3D printing technology to fabricate 3D-miniaturized fluidic device for droplet generation (single emulsion) and droplet-in-droplet (double emulsion) without the need for surface wettability treat- ment of the channel walls, by utilizing 3D geometry design and fabrication. A scaling law is formulated to predict the drop size generated in the device. Furthermore, magnetically responsive microspheres are also produced with our emulsion templates, demonstrating the potential applications of this 3D emulsion generator in chemical and material engineering. Finally, we design and 3D-print a hybrid ?plug-and-play? microfluidic droplet generator, which involves a 3D-printed channel chamber and commercial tubings and fittings. By combination of 3D-printed part and market-available parts, this device can be easily assembled and disassembled, which provides a great flexibility for different demands. A scaling law has been proposed… Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Younis, Mohammad I. (committee member), Salama, Khaled N. (committee member), Breadmore, Michael (committee member).

Subjects/Keywords: Droplet; Microbubble; 3D-Printing; Emulsion

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, J. (2016). Generation of emulsion droplets and micro-bubbles in microfluidic devices. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/618374

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Jiaming. “Generation of emulsion droplets and micro-bubbles in microfluidic devices.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/618374.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Jiaming. “Generation of emulsion droplets and micro-bubbles in microfluidic devices.” 2016. Web. 16 Apr 2021.

Vancouver:

Zhang J. Generation of emulsion droplets and micro-bubbles in microfluidic devices. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/618374.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang J. Generation of emulsion droplets and micro-bubbles in microfluidic devices. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/618374

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

23. Saghir, Shahid. Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/621854

► The first objective of the dissertation is to develop a suitable reduced order model capable of investigating the nonlinear mechanical behavior of von-Karman plates under… (more)

▼ The first objective of the dissertation is to develop a suitable reduced order model capable of investigating the nonlinear mechanical behavior of von-Karman plates under electrostatic actuation. The second objective is to investigate the nonlinear static and dynamic behavior of rectangular microplates under small and large actuating forces. In the first part, we present and compare various approaches to develop reduced order models for the nonlinear von-Karman rectangular microplates actuated by nonlinear electrostatic forces. The reduced-order models aim to investigate the static and dynamic behavior of the plate under small and large actuation forces. A fully clamped microplate is considered. Different types of basis functions are used in conjunction with the Galerkin method to discretize the governing equations. First we investigate the convergence with the number of modes retained in the model. Then for validation purpose, a comparison of the static results is made with the results calculated by a nonlinear finite element model. The linear eigenvalue problem for the plate under the electrostatic force is solved for a wide range of voltages up to pull-in. In the second part, we present an investigation of the static and dynamic behavior of a fully clamped microplate. We investigate the effect of different non-dimensional design parameters on the static response. The forced-vibration response of the plate is then investigated when the plate is excited by a harmonic AC load superimposed to a DC load. The dynamic behavior is examined near the primary and secondary (superharmonic and subharmonic) resonances. The microplate shows a strong hardening behavior due to the cubic nonlinearity of midplane stretching. However, the behavior switches to softening as the DC load is increased. Next, near-square plates are studied to understand the effect of geometric imperfections of microplates. In the final part of the dissertation, we investigate the mechanical behavior of initially curved microplates. Microplates often experience an initial curvature imperfection, due to the micro fabrication process, which affects significantly their mechanical behavior. In this case a clamped-free-clamped-free microplate is considered. We validate the reduced order model by comparing the calculated static behavior and the fundamental natural frequency with those computed by a finite element model. As case studies, we consider two commonly encountered profiles of the initial curvature imperfection and study their effects on both the static and dynamic responses of the microplates. Next, an initially curved microplate made of silicon nitride is studied. The static behavior of the microplate is investigated when applying a DC voltage. Then, the dynamic behavior of the microplate is examined under the application of a harmonic AC voltage, superimposed to a DC voltage. Simulation results calculated by the reduced order model are compared with experimental data for model validation purpose, which show good agreement. Advisors/Committee Members: Younis, Mohammad I. (advisor), Laleg-Kirati, Taous-Meriem (committee member), Thoroddsen, Sigurdur T (committee member), Lenci, Stefano (committee member).

Subjects/Keywords: non linear mechanics; microplates; MEMS; Electrostatic force; Dynamics; non linear vibrations

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Saghir, S. (2016). Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/621854

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Saghir, Shahid. “Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/621854.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Saghir, Shahid. “Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation.” 2016. Web. 16 Apr 2021.

Vancouver:

Saghir S. Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/621854.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Saghir S. Nonlinear Mechanics of MEMS Rectangular Microplates under Electrostatic Actuation. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/621854

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

24. Kouraytem, Nadia. On Impact Dynamics under Complex or Extreme Conditions.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/621971

► The impact of a spherical object onto a surface of a liquid, solid or granular material, is a configuration which occurs in numerous industrial and… (more)

▼ The impact of a spherical object onto a surface of a liquid, solid or granular material, is a configuration which occurs in numerous industrial and natural phenomena. The resulting dynamics can produce complex outcomes and often occur on very short time-scales. Their study thereby requires high-speed video imaging, as is done herein. This three-part dissertation investigates widely disparate but kindred impact configurations, where the impacting object is a solid steel sphere, or a molten metal droplet. The substrate, on the other hand, is either granular material, a liquid, or solid ice. Therefore both fluid mechanics and thermodynamics play a key role in some of these dynamics. Part I, investigates the penetration depth of a steel sphere which impacts onto a granular bed containing a mixture of grains of two different sizes. The addition of smaller grains within a bed of larger grains can promote a “lubrication” effect and deeper penetration of the sphere. However, there needs to be enough mass fraction of the smaller grains so that they get lodged between the larger grains and are not simply like isolated rattlers inside the voids between the larger grains. This lubrication occurs even though the addition of the small grains increases the overall packing fraction of the bed. We compare the enhanced penetration for the mixtures to a simple interpolative model based on the results for monodispersed media of the constitutive sizes. The strongest lubrication is observed for large irregular shaped Ottawa sand grains, which are seeded with small spherical glass beads. Part II, tackles the topic of a molten metal drop impacting onto a pool of water. When the drop temperature is far above the boiling temperature of water, a continuous vapor layer can form at the interface between the metal and water, in what is called the Leidenfrost phenomenon. This vapor layer can become unstable forming what is called a vapor explosion, which can break up the molten metal drop. We study the details of these explosions and characterize the metal debris. We contrast the results for two different metals, i.e. tin and a special metal alloy called Field’s metal. For tin the drop solidifies and forms a porous foam-like solid, whereas the Field’s metal breaks up into a multitude of spherical beads, with a range of sizes as small as a few microns. We attribute this difference to the much lower melting point of the Field’s metal, which is only 60 °C, compared to 230 °C for the tin. This allows more fragmentation of the Field’s metal drop before it solidifies. When the temperature of the impacting metal is increased, high-speed imaging reveals a sequence of up to three vapor explosions, each of increasing intensity. We measure the acceleration of the vapor interface and compare the size-distribution of the microbeads to the fastest growing instability mode of the corresponding Rayleigh-Taylor instability. Part III, investigates the coefficient of restitution when a steel sphere impacts on an ice surface. As observed in earlier studies the… Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Farooq, Aamir (committee member), Stenchikov, Georgiy L. (committee member), Katsuragi, Hiroaki (committee member).

Subjects/Keywords: granular matter; Bi-modal grains; Vapor explosion; Field's metal; High-temperature; High-speed imaging

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kouraytem, N. (2016). On Impact Dynamics under Complex or Extreme Conditions. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/621971

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kouraytem, Nadia. “On Impact Dynamics under Complex or Extreme Conditions.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/621971.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kouraytem, Nadia. “On Impact Dynamics under Complex or Extreme Conditions.” 2016. Web. 16 Apr 2021.

Vancouver:

Kouraytem N. On Impact Dynamics under Complex or Extreme Conditions. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/621971.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kouraytem N. On Impact Dynamics under Complex or Extreme Conditions. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/621971

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

25. Conchouso Gonzalez, David. Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/623458

► At the cutting edge of the chemical and biological research, innovation takes place in a field referred to as Lab on Chip (LoC), a multi-disciplinary… (more)

▼ At the cutting edge of the chemical and biological research, innovation takes place in a field referred to as Lab on Chip (LoC), a multi-disciplinary area that combines biology, chemistry, electronics, microfabrication, and fluid mechanics. Within this field, droplets have been used as microreactors to produce advanced materials like quantum dots, micro and nanoparticles, active pharmaceutical ingredients, etc. The size of these microreactors offers distinct advantages, which were not possible using batch technologies. For example, they allow for lower reagent waste, minimal energy consumption, increased safety, as well as better process control of reaction conditions like temperature regulation, residence times, and response times among others. One of the biggest drawbacks associated with this technology is its limited production volume that prevents it from reaching industrial applications. The standard production rates for a single droplet microfluidic device is in the range of 1-10mLh-1, whereas industrial applications usually demand production rates several orders of magnitude higher. Although substantial work has been recently undertaken in the development scaled-out solutions, which run in parallel several droplet generators. Complex fluid mechanics and limitations on the manufacturing capacity have constrained these works to explore only in-plane parallelization. This thesis investigates a three-dimensional parallelization by proposing a microfluidic system that is comprised of a stack of droplet generation layers working on the liquid-liquid ow regime. Its realization implied a study of the characteristics of conventional droplet generators and the development of a fabrication process for 3D networks of microchannels. Finally, the combination of these studies resulted in a functional 3D parallelization system with the highest production rate (i.e. 1 Lh-1) at the time of its publication. Additionally, this architecture can reach industrially relevant production rates as more devices can be integrated into the same chip and many chips can compose a manufacturing plant. The thesis also addresses the concerns about system reliability and quality control by proposing capacitive and radio frequency resonator sensors that can measure accurately increments as small as 2.4% in the water-in-oil volume fraction and identify errors during droplet production. Advisors/Committee Members: Foulds, Ian G. (advisor), Kosel, Jürgen (advisor), Thoroddsen, Sigurdur T (committee member), deMello, Andrew J. (committee member).

Subjects/Keywords: Droplet-microfluidics; Scale-out; Parallelization; Microreaction-Technologies; Microfluidic-Sensors; Crystallization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Conchouso Gonzalez, D. (2017). Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/623458

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Conchouso Gonzalez, David. “Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/623458.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Conchouso Gonzalez, David. “Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale.” 2017. Web. 16 Apr 2021.

Vancouver:

Conchouso Gonzalez D. Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/623458.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Conchouso Gonzalez D. Parallelization of Droplet Microfluidic Systems for the Sustainable Production of Micro-Reactors at Industrial Scale. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/623458

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

26. Wafai, Husam. Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/627434

► Thermoplastics reinforced with continuous fibers are very promising building materials for the auto industry and consumer electronics to reduce the weight of vehicles and portable… (more)

Subjects/Keywords: Thermoplastic; Cross-ply; In-situ observations; Damage; Copolymer

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wafai, H. (2018). Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/627434

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wafai, Husam. “Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/627434.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wafai, Husam. “Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading.” 2018. Web. 16 Apr 2021.

Vancouver:

Wafai H. Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/627434.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wafai H. Effects of matrix properties on microscale damage in thermoplastic laminates under quasi-static and impact loading. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/627434

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

27. Castro, David. Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/627925

► Lab-on-Chip, the miniaturization of the chemical and analytical lab, is an endeavor that seems to come out of science fiction yet is slowly becoming a… (more)

▼ Lab-on-Chip, the miniaturization of the chemical and analytical lab, is an endeavor that seems to come out of science fiction yet is slowly becoming a reality. It is a multidisciplinary field that combines different areas of science and engineering. Within these areas, microfluidics is a specialized field that deals with the behavior, control and manipulation of small volumes of fluids. Agglutination assays are rapid, single-step, low-cost immunoassays that use microspheres to detect a wide variety molecules and pathogens by using a specific antigen-antibody interaction. Agglutination assays are particularly suitable for the miniaturization and automation that two-phase microfluidics can offer, a combination that can help tackle the ever pressing need of high-throughput screening for blood banks, epidemiology, food banks diagnosis of infectious diseases. In this thesis, we present a two-phase microfluidic system capable of incubating and quantifying agglutination assays. The microfluidic channel is a simple fabrication solution, using laboratory tubing. These assays are incubated by highly efficient passive mixing with a sample-to-answer time of 2.5 min, a 5-10 fold improvement over traditional agglutination assays. It has a user-friendly interface that that does not require droplet generators, in which a pipette is used to continuously insert assays on-demand, with no down-time in between experiments at 360 assays/h. System parameters are explored, using the streptavidin-biotin interaction as a model assay, with a minimum detection limit of 50 ng/mL using optical image analysis. We compare optical image analysis and light scattering as quantification methods, and demonstrate the first light scattering quantification of agglutination assays in a two-phase ow format. The application can be potentially applied to other biomarkers, which we demonstrate using C-reactive protein (CRP) assays. Using our system, we can take a commercially available CRP qualitative slide agglutination assay, and turn it into a quantitative High Sensitivity-CRP test, with a lower detection limit of 0.5 mg/L using light scattering. Agglutination assays are an incredibly versatile tool, capable of detecting an ever-growing catalog of infectious diseases, proteins and metabolites. A system such as that presented in this thesis is a step towards being able to produce high throughput microfluidic solutions with widespread adoption. Advisors/Committee Members: Foulds, Ian G. (advisor), Kosel, Jürgen (committee member), Thoroddsen, Sigurdur T (committee member), Tabeling, Patrick (committee member).

Subjects/Keywords: Lab On Chip; Agglutination assays; High-throughput; droplet microfluidics; C-reactive protein; light scattering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Castro, D. (2018). Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/627925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Castro, David. “Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/627925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Castro, David. “Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays.” 2018. Web. 16 Apr 2021.

Vancouver:

Castro D. Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/627925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Castro D. Two-Phase Microfluidic Systems for High Throughput Quantification of Agglutination Assays. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/627925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

28. Al-Marouf, Mohamad. A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/630093

► We present an Embedded Boundary with Adaptive Mesh Refinement technique for solving the compressible Navier Stokes equations in arbitrary complex domains; followed by a numerical… (more)

▼ We present an Embedded Boundary with Adaptive Mesh Refinement technique for solving the compressible Navier Stokes equations in arbitrary complex domains; followed by a numerical studies for the effect of circular cylinders on the transient dynamics of the Richtmyer-Meshkov Instability. A PDE multidimensional extrapolation approach is used to reconstruct the solution in the ghost-fluid regions and imposing boundary conditions on the fluid-solid interface, coupled with a multi-dimensional algebraic interpolation for freshly cleared cells. The Navier Stokes equations are numerically solved by the second order multidimensional upwind method. Block-structured AMR, implemented with the Chombo framework, is utilized to reduce the computational cost while keeping high resolution mesh around the Embedded Boundary and regions of high gradient solutions. The versatility of the method is demonstrated via several numerical examples, in both static and moving geometry, ranging from low Mach number nearly incompressible to supersonic flows. Our simulation results are extensively verified against other numerical results and validated against available experimental results where applicable. The effects on the transient dynamics of the Richtmyer-Meshkov instability due to small scale perturbations introduced on the shock-wave or the material interface by a single or set of solid circular cylinders were computationally investigated using the developed technique. First, we discuss the RMI initiated on a flat interface by a rippled shock-wave that is disturbed by a single circular cylinder. Then, we study the effect of introducing a number of circular cylinders on the interface. The arrangement of the cylinders set mimic (in a two dimensional domain) the presence of the solid supporting grid wires used in the formation of the material interface in the experimental setup. We analyzed their effects on the mixing layer growth and the mixedness level, and qualitatively demonstrate the cylinders' perturbation effects on the mixing layer structure. We modeled the cylinders' influence based on their diameters; and showed the model ability to predict the variation of the mixing layer growth for different flow parameters. Advisors/Committee Members: Samtaney, Ravi (advisor), Thoroddsen, Sigurdur T (committee member), Keyes, David E. (committee member), Colella, Phillip (committee member).

Subjects/Keywords: Computational fluid dynamics; Compressible flow; High-order reconstruction algorithm; Cartesian approach; Adaptive mesh refinement; Richtmyer-Meshkov instability

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al-Marouf, M. (2018). A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/630093

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al-Marouf, Mohamad. “A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/630093.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al-Marouf, Mohamad. “A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry.” 2018. Web. 16 Apr 2021.

Vancouver:

Al-Marouf M. A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/630093.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al-Marouf M. A Versatile Embedded Boundary Adaptive Mesh Method for Compressible Flow in Complex Geometry. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/630093

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

29. Aguirre-Pablo, Andres A. Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements.

Degree: Physical Science and Engineering (PSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/630117

► Over the last 30 years, Particle Image Velocimetry (PIV) has become the most powerful tool to study velocity fields in fluid mechanics. This technique is… (more)

▼ Over the last 30 years, Particle Image Velocimetry (PIV) has become the most powerful tool to study velocity fields in fluid mechanics. This technique is non-intrusive requiring seeding the flow with small tracer particles. The hardware required for these sophisticated PIV methods is very expensive (CCD or CMOS high-speed cameras and lasers), and the present dissertation aims to develop novel and inexpensive alternatives. The first part of this work investigates the use of multiple smartphones as a lower-cost Tomographic-PIV system for reconstructing 3D-3C velocity fields. We use colored shadows to imprint two or three different time-steps on the same image in a RGB-backlit configuration. We use commercially available Tomo-PIV software for the calibration, 3-D particle reconstruction, and particle-field correlations, to obtain three velocity components in a volume. The proposed system is tested with a vortex ring and the results are compared to stereoscopic-PIV for error estimations. We expand this work to a high-speed time-resolved setup to obtain 3D-3C velocity fields in time. This improvement is possible using newer smartphones capable of recording high-speed video at HD resolution. The challenges of using such cameras are presented and tackled. The illumination system, testing flow and image processing is similar to the one presented in the first section. A benchmark of the smartphone system is carried out comparing it to a Tomo-PIV system capable of recording 4K video resolution. A different approach is proposed to reconstruct a 3D-3C velocity field using a single color video camera. This technique uses chromatic structured light with color-gradients projected perpendicularly with respect to the color camera. Thus, we encode the depth position of the particles with a different wavelength of light. Different light sources are used to produce such color gradients. Finally, a variation of the previous technique is tested using a single monochromatic camera and structured volumetric illumination with spatially varying intensity profiles. This technique enables us to encode the depth position of every particle in their intrinsic brightness. The proposed system can achieve a depth resolution of 200 levels, i.e., an order of magnitude higher than previously proposed systems. Advisors/Committee Members: Thoroddsen, Sigurdur T (advisor), Farooq, Aamir (committee member), Heidrich, Wolfgang (committee member), Castrejon-Pita, Alfonso (committee member).

Subjects/Keywords: Tomographic-PIV; Flow Measurements; 3D-PTV; PSV

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aguirre-Pablo, A. A. (2018). Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/630117

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Aguirre-Pablo, Andres A. “Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/630117.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Aguirre-Pablo, Andres A. “Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements.” 2018. Web. 16 Apr 2021.

Vancouver:

Aguirre-Pablo AA. Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/630117.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Aguirre-Pablo AA. Novel and Inexpensive Three-dimensional Velocimetry Techniques for Flows Visualization and Measurements. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/630117

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

30. Alfosail, Feras. Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators.

Degree: Physical Science and Engineering (PSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/652451

► This work presents a combination of analytical and numerical approaches to gain an insight of the dynamics of marine risers and micro machined resonators. Despite… (more)

▼ This work presents a combination of analytical and numerical approaches to gain an insight of the dynamics of marine risers and micro machined resonators. Despite their scale difference, we show that both systems share similarities in terms of initial static deformation, quadratic and cubic nonlinearities, and internal resonances. First, we utilize the state space method to study the eigenvalue problem of vertical riser. An orthonormalization step is introduced to recover the numerical scheme during numerical integration and we investigate the effect of applied tension, apparent weight, and higher-order modes on the accuracy of the scheme. We show that the method is advantageous to find eigenvalues and mode shapes of vertical risers in comparison to other methods. The work is extended to study the eigenvalue problem of inclined risers considering the influence of static deflection, self-weight and mid-plane stretching. The linear dynamics is solved using Galerkin method. The results demonstrate that under the influence of tension and configuration angle, the frequencies exhibit commensurate ratio with respect to the first natural frequency leading to the possible activation of internal resonances. Next, we study the nonlinear interactions of inclined risers considering two-to-one and three-to-one internal resonances under single and multifrequency excitations. The multiple times scale method is applied to study the nonlinear interaction and results are compared to those from a Galerkin solution showing good agreement. Time histories and perturbation’s response curves, in addition to the dynamical solution obtained by Galerkin and stability analysis using Floquet theory are utilized to examine the system. These results feature nonlinear energy exchange, saddle node jumps, and Hopf bifurcations leading to complex dynamic motion that can endanger the riser structure. Finally, the analysis using pertubation is extended to investigate the two-to-one internal resonance in micromachined arch beams between its first two symmetric modes. The response is analyzed using the perturbation method considering the nonlinear interaction and two simultaneous excitations at higher AC voltages. Good agreement is found among the results of pertubations, Galerkin and experimental data from fabricated Silicon arch beam. Different types of bifurcations are observed which can lead to quasi-periodic and potentially chaotic motions. Advisors/Committee Members: Younis, Mohammad I. (advisor), Shamma, Jeff S. (committee member), Thoroddsen, Sigurdur T (committee member), Lenci, Stefano (committee member).

Subjects/Keywords: Marine Riser; Nonlinear Dynamics; Internal Resonances; MEMS resonators; Multifrequency; Perturbations

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alfosail, F. (2019). Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/652451

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alfosail, Feras. “Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 16, 2021. http://hdl.handle.net/10754/652451.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alfosail, Feras. “Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators.” 2019. Web. 16 Apr 2021.

Vancouver:

Alfosail F. Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10754/652451.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alfosail F. Dynamics and Nonlinear Interactions of Macro and Micro Structures: Inclined Marine Risers and MEMS Resonators. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/652451

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations