subject:(flow breakdown)

Indian Institute of Science

1. Sarasija, S. Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall.

Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2985

► Swirling flows abound in nature and numerous engineering applications. Under conditions which are not completely understood, the swirling cores could undergo a sudden enlargement of… (more)

Subjects/Keywords: Vortex Breakdown; Vorticity; Helicity; Rotating Endwall; Vortex Breakdown-Closed Cylinder; Flow Visualization; Spiral Breakdown; Vortex Bursting; Fluid Mechanics; Inviscid Vortex Dynamics Model; Vorticity Vectors; Aerospace Engineering

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APA (6^th Edition):

Sarasija, S. (2018). Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2985

Chicago Manual of Style (16^th Edition):

Sarasija, S. “Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 04, 2021. http://etd.iisc.ac.in/handle/2005/2985.

MLA Handbook (7^th Edition):

Sarasija, S. “Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall.” 2018. Web. 04 Mar 2021.

Vancouver:

Sarasija S. Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 04]. Available from: http://etd.iisc.ac.in/handle/2005/2985.

Council of Science Editors:

Sarasija S. Studies on Vortex Breakdown in a Closed Cylinder with a Rotating Endwall. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2985

Delft University of Technology

2. van Lindonk, William (author). Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:1181cb6e-ff70-4f12-bea6-ab513865d4e8

► In this thesis an investigation is performed into the effect of different speed limits on freeway capacity. From literature, much is known about the variety… (more)

▼ In this thesis an investigation is performed into the effect of different speed limits on freeway capacity. From literature, much is known about the variety of factors that affect capacity, but the exact effect of the speed limit on capacity is not yet clear. In recent years, several speed limits changes have taken place at multiple two-lane freeway bottlenecks throughout The Netherlands, which makes it possible to compare effects of different speed limits at the same location. To evaluate the effect of the speed limit on capacity, the Product Limit Method has been applied to identify breakdown flows and generate capacity distributions, which could subsequently be compared for different limits. In the comparison of capacity distributions under different speed limits, it was found that significant changes in capacity had occurred, but that no uniform direction of the effect could be found. Subsequently, to control for location specific factors and other variables, Fixed Effects regression has been used to determine the effect of the speed limit on the breakdown flow. It was found that the breakdown flow under the 120 km/h limit was significantly higher than under the 130 km/h limit (in the range of 60 to 190 vehicles per hour) and that the breakdown flow under the 100 km/h limit was, in some cases, also higher than under the 130 km/h limit. In addition to this, it was found that a significant positive relation exists between the height of the speed limit and the fraction of flow in the passing lane. Moreover, it was shown that the relation between the fraction of flow in the passing lane and the level of breakdown flow was best represented by a quadratic relation, which could indicate that an “optimal” distribution of flows may exist. Given the results of this thesis, it is posed that a change in the speed limit is likely to affect capacity primarily through altering the lane flow distribution and that it will depend on the layout of a freeway location what the optimal lane flow distribution is and which speed limit leads to this optimal lane flow distribution. Advisors/Committee Members: Hoogendoorn, S.P. (mentor), Knoop, V.L. (graduation committee), van Cranenburgh, S. (graduation committee), Taale, H. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Speed Limits; Capacity Research; Breakdown Flow; Product Limit Method; Fixed Effects Regression; Two-Lane Freeway; Traffic Flow Theory; Lane Flow Distribution; Bottleneck Identification; Capacity Distribution

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APA (6^th Edition):

van Lindonk, W. (. (2020). Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1181cb6e-ff70-4f12-bea6-ab513865d4e8

Chicago Manual of Style (16^th Edition):

van Lindonk, William (author). “Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks.” 2020. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:1181cb6e-ff70-4f12-bea6-ab513865d4e8.

MLA Handbook (7^th Edition):

van Lindonk, William (author). “Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks.” 2020. Web. 04 Mar 2021.

Vancouver:

van Lindonk W(. Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:1181cb6e-ff70-4f12-bea6-ab513865d4e8.

Council of Science Editors:

van Lindonk W(. Speed limits and their effect on freeway capacity: An investigation of two lane freeway bottlenecks. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:1181cb6e-ff70-4f12-bea6-ab513865d4e8

Brno University of Technology

3. Štefan, David. Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/51597

► This work deals with study of swirling flows where the spiral vortical structure appears. The main relation is to flow seen in the draft tube… (more)

▼ This work deals with study of swirling flows where the spiral vortical structure appears. The main relation is to flow seen in the draft tube cone of hydraulic turbines operated out of the design point (i.e. best efficiency point). In this cases large coherent vortex structure (vortex rope) appears and consequently high pressure pulsations are propagated to the whole machine system leading to possible restriction of turbine operation. This flow features are consequence of flow instability called vortex breakdown in case of Francis turbine operated at part load (flow rate lower than optimal one). The present study is carried out using simplified device of swirl generator in order to access similar flow conditions as can be found in real hydraulic turbines. Both the dynamic and dissipation effect of spiral vortex breakdown are investigated. The first part of thesis deals with spiral form of vortex breakdown. The experimentally measured velocity profiles (LDA) and wall static pressures are correlated with numerical simulations carried out using open-source CFD package OpenFOAM 2.2.2. The high speed camera recording of cavitating vortex core is used to obtain image ensemble for further post-processing. The dissipation effect of spiral vortex structure is in detail discussed based on computed flow fields. The second part of thesis is dedicated to the application of POD decomposition to the study of spatio-temporal features of spiral vortex dynamics. Firstly the POD is applied to the both the experimentally obtained image ensemble of cavitating vortex and numerically computed static pressure fields. Secondly the comprehensive analysis of spiral vortex mitigation effect by the axial water jet is analyzed. The collaborative study employing the swirl generator apparatus designed by the researchers from Politehnica University of Timisoara in Romania is performed and changes in spatio-temporal vortex dynamic are studied. In this study the numerical data (in a form of three-dimensional pressure and velocity fields) are obtained using commercial CFD software ANSYS Fluent R14. Advisors/Committee Members: Rudolf, Pavel (advisor), Drábková, Sylva (referee), Koutník,, Jiří (referee), Skoták, Aleš (referee).

Subjects/Keywords: dissipation; swirling flow; coherent structure; spiral vortex; vortex rope; vortex breakdown; diffuser; draft tube; cavitation; pressure pulsations; POD; OpenFOAM; LDA.; dissipation; swirling flow; coherent structure; spiral vortex; vortex rope; vortex breakdown; diffuser; draft tube; cavitation; pressure pulsations; POD; OpenFOAM; LDA.

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APA (6^th Edition):

Štefan, D. (2019). Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/51597

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):

Štefan, David. “Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/51597.

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

MLA Handbook (7^th Edition):

Štefan, David. “Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures.” 2019. Web. 04 Mar 2021.

Vancouver:

Štefan D. Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/51597.

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

Council of Science Editors:

Štefan D. Study of the Dissipation in Spiraling Vortical Structures: Study of the Dissipation in Spiraling Vortical Structures. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/51597

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

4. Kianfar, Jalil. Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis.

Degree: 2013, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/37846

► [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Over the past decades environmental sustainability and mitigating congestion has been a significant challenge in… (more)

▼ [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Over the past decades environmental sustainability and mitigating congestion has been a significant challenge in urban areas in many countries. Freeway traffic management systems are aimed to improve traffic conditions by better managing existing freeway facilities. This dissertation presents an evaluation methodology that consists of series of statistical tests to identify the changes in flow-occupancy plot and flow breakdown on freeways. Two-dimensional Kolmogorov-Smirnov test was used to examine the statistical significance of changes in the overall flow-occupancy distribution. Curve-fitting techniques were used to produce before and after flow-occupancy fitted plots. In order to compare the fitted plots, statistical tests were presented to identify if slopes of fitted lines were statistically different. One challenge in creating traffic flow plots is the identification of critical occupancy. An automated procedure based on clustering techniques was presented to alleviate the modeler discretion from identifying the critical occupancy value. The impact of freeway traffic management systems on the probability of flow breakdown was also investigated. A non-parametric product-limit method and parametric Weibull distributions were used to model flow breakdown distributions. The applicability of presented methodologies for evaluating the freeway traffic management systems was illustrated using two case studies; a variable speed limit system in St. Louis, Missouri, and a freeway ramp metering system in the Twin Cities, Minnesota. The two-dimensional Kolmogorov-Smirnov test was illustrated to be useful in identifying the changes in before and after study of flow-occupancy distributions. Clustering techniques were successfully applied to partition traffic data to two regimes and to create flow-occupancy diagrams and to identify flow breakdown. Finally, an examination of the breakdown probability distribution highlighted its values as a more complete performance measure than capacity or critical occupancy. Advisors/Committee Members: Edara, Praveen K. (Praveen Kumar) (advisor), University of Missouri-Columbia. Graduate School. Theses and Dissertations. Dissertations. 2013 Dissertations (other).

Subjects/Keywords: traffic management system; flow-occupancy plot; flow breakdown; critical occupancy

…84 5.3.2 Flow Breakdown Distributions… …Twin Cities….. �� .…39 Table 3-3. Pre-breakdown flow, post-breakdown flow, and critical… …flow, post-breakdown flow, and critical occupancies at study locations B and C for each lane… …45 Table 3-5. Pre-breakdown flow, post-breakdown flow, and critical occupancies at the Twin… …breakdown flow and post-breakdown flow �� …...75 Table 5-1. Weibull…

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APA (6^th Edition):

Kianfar, J. (2013). Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/37846

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):

Kianfar, Jalil. “Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis.” 2013. Thesis, University of Missouri – Columbia. Accessed March 04, 2021. http://hdl.handle.net/10355/37846.

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

MLA Handbook (7^th Edition):

Kianfar, Jalil. “Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis.” 2013. Web. 04 Mar 2021.

Vancouver:

Kianfar J. Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis. [Internet] [Thesis]. University of Missouri – Columbia; 2013. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10355/37846.

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

Council of Science Editors:

Kianfar J. Evaluation of the effectiveness of freeway traffic management systems using flow-occupancy diagrams and capacity analysis. [Thesis]. University of Missouri – Columbia; 2013. Available from: http://hdl.handle.net/10355/37846

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

Indian Institute of Science

5. Santhosh, R. Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3856

► The efficient and enhanced mixing of heat and incoming reactants is achieved in modern gas turbine systems by employing swirling flows. This is realized by… (more)

▼ The efficient and enhanced mixing of heat and incoming reactants is achieved in modern gas turbine systems by employing swirling flows. This is realized by a low velocity region (internal recirculation zone -IRZ) zone resulting from vortex breakdown phenomenon. Besides, IRZ acts as effective flame holder/stabilization mode. Double concentric swirling jet is employed in plethora of industrial applications such as heat exchange, spray drying and combustion. As such, understanding essential features of vortex breakdown induced IRZ and its acoustic response in swirling flow/flame is important in thermo-acoustic instability studies. The key results of the present experimental investigation are discussed in four parts. In the first part, primary transition (sub-critical states) from a pre-vortex breakdown (Pre-VB) flow reversal to a fully-developed central toroidal recirculation zone (CTRZ) in a non-reacting, double-concentric swirling jet configuration is discussed when the swirl number is varied in the range 0.592 S 0.801. This transition proceeds with the formation of two intermediate, critical flow regimes. First, a partially-penetrated vortex breakdown bubble (VBB) is formed that indicates the first occurrence of an enclosed structure resulting in an opposed flow stagnation region. Second, a metastable transition structure is formed that marks the collapse of inner mixing vortices. In this study, the time-averaged topological changes in the coherent recirculation structures are discussed based on the non-dimensional modified Rossby number (Rom) which appears to describe the spreading of the zone of swirl influence in different flow regimes. The second part describes a secondary transition from an open-bubble type axisymmetric vortex breakdown (sub-critical states) to partially-open bubble mode (super-critical states) through an intermediate, critical regime of conical sheet formation for flow modes Rom ≤ 1 is discussed when the swirl number (S) is increased beyond 0.801. In the third part, amplitude dependent acoustic response of above mentioned sub and supercritical flow states is discussed. It was observed that the global acoustic response of the sub-critical VB states was fundamentally different from their corresponding super-critical modes. In particular, with a stepwise increase in excitation amplitude till a critical value, the sub-critical VB topology moved downstream and radially outward. Beyond a critical magnitude, the VB bubble transited back upstream and finally underwent radial shrinkage at the threshold excitation amplitude. On the other hand, the topology of the super-critical VB state continuously moved downstream and radially outwards and finally widened/fanned-out at threshold amplitude. In the final part, transition in time-averaged flame global flame structure is reported as a function of geometric swirl number. In particular, with a stepwise increase in swirl intensity, primary transition is depicted as a transformation from zero-swirl straight jet flame to lifted flame with blue base and… Advisors/Committee Members: Basu, Saptarshi (advisor).

Subjects/Keywords: Coaxial Isothermal Swirling Jet; Gas Turbines; Internal Combustion Engines; Swirling Flow Jets; Swirling Flow/Flame; Thermo-Acoustic Combustion Instability; Vortex Breakdown; Jets-Fluid Dynamics; Combustion; Co-axial Isothermal Swirling Flow; Vortex Breakdown Modes; Swirling Flame; Isothermal Swirling Flow Field; Isothermal Swirling Co-axial Jet; Co-axial Isothermal Swirling Jet; Isothermal Coaxial Swirling Jet; Mechanical Engineering

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APA (6^th Edition):

Santhosh, R. (2018). Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3856

Chicago Manual of Style (16^th Edition):

Santhosh, R. “Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed March 04, 2021. http://etd.iisc.ac.in/handle/2005/3856.

MLA Handbook (7^th Edition):

Santhosh, R. “Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame.” 2018. Web. 04 Mar 2021.

Vancouver:

Santhosh R. Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Mar 04]. Available from: http://etd.iisc.ac.in/handle/2005/3856.

Council of Science Editors:

Santhosh R. Transition and Acoustic Response of Vortex Breakdown Modes in Unconfined Coaxial Swirling Flow and Flame. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3856

6. Sellberg, Charlott. A comparative theoretical and empirical analysis of three methods for workplace studies.

Degree: Humanities and Informatics, 2011, University of Skövde

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5214

► Workplace studies in Human-Computer Interaction (HCI) is a research field that has expanded in an explosive way during the recent years. Today there is… (more)

Subjects/Keywords: Human-Computer Interaction; Workplace studies; Method comparison; Contextual Design; Determining Information Flow Breakdown; Capturing Semi-Automated Decision-Making; Dental Informatics.; Cognitive science; Kognitionsforskning

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APA (6^th Edition):

Sellberg, C. (2011). A comparative theoretical and empirical analysis of three methods for workplace studies. (Thesis). University of Skövde. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5214

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):

Sellberg, Charlott. “A comparative theoretical and empirical analysis of three methods for workplace studies.” 2011. Thesis, University of Skövde. Accessed March 04, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5214.

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

MLA Handbook (7^th Edition):

Sellberg, Charlott. “A comparative theoretical and empirical analysis of three methods for workplace studies.” 2011. Web. 04 Mar 2021.

Vancouver:

Sellberg C. A comparative theoretical and empirical analysis of three methods for workplace studies. [Internet] [Thesis]. University of Skövde; 2011. [cited 2021 Mar 04]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5214.

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

Council of Science Editors:

Sellberg C. A comparative theoretical and empirical analysis of three methods for workplace studies. [Thesis]. University of Skövde; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5214

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

7. CUI YONGDONG. Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container.

Degree: 2009, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/15904

Subjects/Keywords: Vortex breakdown; stability; flow visualization; hot-film measurement; bifurcations; modulation

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APA (6^th Edition):

YONGDONG, C. (2009). Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/15904

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):

YONGDONG, CUI. “Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container.” 2009. Thesis, National University of Singapore. Accessed March 04, 2021. http://scholarbank.nus.edu.sg/handle/10635/15904.

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

MLA Handbook (7^th Edition):

YONGDONG, CUI. “Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container.” 2009. Web. 04 Mar 2021.

Vancouver:

YONGDONG C. Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container. [Internet] [Thesis]. National University of Singapore; 2009. [cited 2021 Mar 04]. Available from: http://scholarbank.nus.edu.sg/handle/10635/15904.

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

Council of Science Editors:

YONGDONG C. Studies of Vortex Breakdown and its Stability in a Confined Cylindrical Container. [Thesis]. National University of Singapore; 2009. Available from: http://scholarbank.nus.edu.sg/handle/10635/15904

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

Montana State University

8. Jurenka, Paul Matthew. Research on a dielectric breakdown probe for measuring the density of a flowing gas.

Degree: MS, College of Engineering, 1989, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/6683

Subjects/Keywords: Gases Density.; Pitot tubes.; Probes (Electronic instruments); Gas flow.; Breakdown voltage.

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APA (6^th Edition):

Jurenka, P. M. (1989). Research on a dielectric breakdown probe for measuring the density of a flowing gas. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/6683

Chicago Manual of Style (16^th Edition):

Jurenka, Paul Matthew. “Research on a dielectric breakdown probe for measuring the density of a flowing gas.” 1989. Masters Thesis, Montana State University. Accessed March 04, 2021. https://scholarworks.montana.edu/xmlui/handle/1/6683.

MLA Handbook (7^th Edition):

Jurenka, Paul Matthew. “Research on a dielectric breakdown probe for measuring the density of a flowing gas.” 1989. Web. 04 Mar 2021.

Vancouver:

Jurenka PM. Research on a dielectric breakdown probe for measuring the density of a flowing gas. [Internet] [Masters thesis]. Montana State University; 1989. [cited 2021 Mar 04]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6683.

Council of Science Editors:

Jurenka PM. Research on a dielectric breakdown probe for measuring the density of a flowing gas. [Masters Thesis]. Montana State University; 1989. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6683

Texas Tech University

9. Glass, Bradley Lyle. The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch.

Degree: Mechanical Engineering, 1984, Texas Tech University

URL: http://hdl.handle.net/2346/21835

► The effects of boundary layer development and turbulence on a gas-blown spark gap switch operated in the self breakdown mode are presented. The switch consisted… (more)

Subjects/Keywords: Laminar flow; Boundary layer; Turbulence; Breakdown voltage; Electric discharges through gases

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APA (6^th Edition):

Glass, B. L. (1984). The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/21835

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):

Glass, Bradley Lyle. “The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch.” 1984. Thesis, Texas Tech University. Accessed March 04, 2021. http://hdl.handle.net/2346/21835.

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

MLA Handbook (7^th Edition):

Glass, Bradley Lyle. “The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch.” 1984. Web. 04 Mar 2021.

Vancouver:

Glass BL. The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch. [Internet] [Thesis]. Texas Tech University; 1984. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2346/21835.

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

Council of Science Editors:

Glass BL. The effects of boundary layer development and turbulence on the performance of a gas-blown spark gap switch. [Thesis]. Texas Tech University; 1984. Available from: http://hdl.handle.net/2346/21835

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

Texas Tech University

10. Clarke, James Richard. The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches.

Degree: Mechanical Engineering, 1984, Texas Tech University

URL: http://hdl.handle.net/2346/17575

► The effects of mass flow rate and electrode divergence angle on the performance of a gas-blown spark gap switch operated in the self-breakdown repetitive mode… (more)

Subjects/Keywords: Electric spark gaps; Electrodes; Pulse techniques (Electronics); Electric switchgear; Breakdown voltage; Laminar flow

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APA (6^th Edition):

Clarke, J. R. (1984). The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/17575

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):

Clarke, James Richard. “The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches.” 1984. Thesis, Texas Tech University. Accessed March 04, 2021. http://hdl.handle.net/2346/17575.

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

MLA Handbook (7^th Edition):

Clarke, James Richard. “The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches.” 1984. Web. 04 Mar 2021.

Vancouver:

Clarke JR. The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches. [Internet] [Thesis]. Texas Tech University; 1984. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2346/17575.

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

Council of Science Editors:

Clarke JR. The effects of mass flow rate and electrode divergence angle on the performance of gas-blown spark gap switches. [Thesis]. Texas Tech University; 1984. Available from: http://hdl.handle.net/2346/17575

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

Louisiana State University

11. Kinik, Koray. Risk of well integrity failure due sustained casing pressure.

Degree: MSPE, Petroleum Engineering, 2012, Louisiana State University

URL: etd-04192012-102434 ; https://digitalcommons.lsu.edu/gradschool_theses/3456

► Sustained casing pressure (SCP) is considered a well integrity problem. The approach of this study is to look at SCP as environmental risk due hydrocarbon… (more)

▼ Sustained casing pressure (SCP) is considered a well integrity problem. The approach of this study is to look at SCP as environmental risk due hydrocarbon release. Currently, the risk is qualified by the value of surface pressure (Pcsg) that may cause failure of casing head. However, the resulting rate of gas emission to the atmosphere is not considered. Also not considered is a possibility of breaching the casing shoe due transmission of Pcsg downhole. The objective of this study is to develop methods for maximum possible air emission rates (MER) and risk of subsurface well integrity failure due SCP. Mathematical models and software are developed for computing MER, casing shoe strength (CSS) determined by leak-off test (LOT), and casing shoe pressure load resulting from SCP (SCPd). The models are used to find controlling parameters, identify the best and least-desirable scenarios, and assess environmental risk. It is concluded that emission potential of SCP wells with high wellhead pressure (Pcsg) can be quite small. The CSS model study reveals the importance of data recorded from LOT; particularly the time after circulation was stopped – the non-circulation time (∆ts). Ignoring ∆ts would result in underestimation of the ultimate CSS. The error is caused by the cumulative effect of thermally induced rock stresses, which strongly depend on ∆ts. The study displayed SCPd being controlled by the annular fluid properties which are subject to change in long time through mud aging; and mostly being overestimated. Comparison of surface versus subsurface failure scenarios yielded cases where the casing shoe demonstrates more restrictive failure criterion (CSS) than the burst rating of wellhead (MAWOP). Risk of casing shoe breaching (RK) is quantified using the CSS and SCPd models and application of risk analysis technique (QRA). The CSS distribution followed log-normal trend due the effect of ∆ts, while the SCPd distribution maybe of various shapes dependent on the annular fluid size and properties that are not well known. Possible scenarios of casing shoe breaching are statistically tested as a hypothesis of two means. The study produced engrossingly variant outcomes, RK changing from 1 to 80 percent.

Subjects/Keywords: liquid unloading; sustained casing pressure; gas migration; multiphase flow in stagnant mud; mud compressibility; mud thixotropy; quantitative risk analysis; leak off testing; wellbore breakdown

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APA (6^th Edition):

Kinik, K. (2012). Risk of well integrity failure due sustained casing pressure. (Masters Thesis). Louisiana State University. Retrieved from etd-04192012-102434 ; https://digitalcommons.lsu.edu/gradschool_theses/3456

Chicago Manual of Style (16^th Edition):

Kinik, Koray. “Risk of well integrity failure due sustained casing pressure.” 2012. Masters Thesis, Louisiana State University. Accessed March 04, 2021. etd-04192012-102434 ; https://digitalcommons.lsu.edu/gradschool_theses/3456.

MLA Handbook (7^th Edition):

Kinik, Koray. “Risk of well integrity failure due sustained casing pressure.” 2012. Web. 04 Mar 2021.

Vancouver:

Kinik K. Risk of well integrity failure due sustained casing pressure. [Internet] [Masters thesis]. Louisiana State University; 2012. [cited 2021 Mar 04]. Available from: etd-04192012-102434 ; https://digitalcommons.lsu.edu/gradschool_theses/3456.

Council of Science Editors:

Kinik K. Risk of well integrity failure due sustained casing pressure. [Masters Thesis]. Louisiana State University; 2012. Available from: etd-04192012-102434 ; https://digitalcommons.lsu.edu/gradschool_theses/3456

Virginia Tech

12. Rullan, Jose Miguel. The Aerodynamics of Low Sweep Delta Wings.

Degree: PhD, Engineering Science and Mechanics, 2008, Virginia Tech

URL: http://hdl.handle.net/10919/29386

► The aerodynamics of wings with moderately swept wings continues to be a challenging and important problem due to the current and future use in military… (more)

▼ The aerodynamics of wings with moderately swept wings continues to be a challenging and important problem due to the current and future use in military aircraft. And yet, there is very little work devoted to the understanding of the aerodynamics of such wings. The problem is that such wings may be able to sustain attached flow next to broken-down delta-wing vortices, or stall like two-dimensional wings, while shedding vortices with generators parallel to their leading edge. To address this situation we studied the flow field over diamond-shaped planforms and sharp-edged finite wings. Possible mechanisms for flow control were identified and tested. We explored the aerodynamics of swept leading edges with no control. We presented velocity and vorticity distributions along planes normal and parallel to the free stream for wings with diamond shaped planform and sharp leading edges. We also presented pressure distributions over the suction side of the wing. Results indicated that in the inboard part of the wing, an attached vortex can be sustained, reminiscent of delta-wing type of a tip vortex, but further in the outboard region 2-D stall dominated even at 13Â° AOA and total stall at 21Â° AOA. To explore the unsteady flow field and the effectiveness of leading-edge control of the flow over a diamond-planform wing at 13Â° AOA, we employed Particle Image Velocimetry (PIV) at a Reynolds number of 43,000 in a water tunnel. Our results indicated that two-D-like vortices were periodically generated and shed. At the same time, an underline feature of the flow, a leading edge vortex was periodically activated, penetrating the separated flow, eventually emerging downstream of the trailing edge of the wing. To study the motion and its control at higher Reynolds numbers, namely 1.3 x 106 we conducted experiments in a wind tunnel. Three control mechanisms were employed, an oscillating mini-flap, a pulsed jet and spanwise continuous blowing. A finite wing with parallel leading and trailing edges and a rectangular tip was swept by 0Â°, 20Â°, and 40Â° and the pulsed jet employed as is control mechanism. A wing with a diamond-shaped-planform, with a leading edge sweep of 42Â°, was tested with the mini-flap. Surface pressure distributions were obtained and the control flow results were contrasted with the no-control cases. Our results indicated flow control was very effective at 20Â° sweep, but less so at 40Â° or 42Â°. It was found that steady spanwise blowing is much more effective at the higher sweep angle. Advisors/Committee Members: Telionis, Demetri P. (committeechair), Vlachos, Pavlos P. (committee member), Hendricks, Scott L. (committee member), Kriz, Ronald D. (committee member), Ragab, Saad A. (committee member).

Subjects/Keywords: vortex breakdown; streamwise vortex; low sweep delta wings; three-dimensional actuation; flow control

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APA (6^th Edition):

Rullan, J. M. (2008). The Aerodynamics of Low Sweep Delta Wings. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29386

Chicago Manual of Style (16^th Edition):

Rullan, Jose Miguel. “The Aerodynamics of Low Sweep Delta Wings.” 2008. Doctoral Dissertation, Virginia Tech. Accessed March 04, 2021. http://hdl.handle.net/10919/29386.

MLA Handbook (7^th Edition):

Rullan, Jose Miguel. “The Aerodynamics of Low Sweep Delta Wings.” 2008. Web. 04 Mar 2021.

Vancouver:

Rullan JM. The Aerodynamics of Low Sweep Delta Wings. [Internet] [Doctoral dissertation]. Virginia Tech; 2008. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10919/29386.

Council of Science Editors:

Rullan JM. The Aerodynamics of Low Sweep Delta Wings. [Doctoral Dissertation]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/29386

Florida International University

13. Azizi, Leila. Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics.

Degree: PhD, Civil Engineering, 2019, Florida International University

URL: https://digitalcommons.fiu.edu/etd/4319 ; FIDC008844

► The introduction of connected vehicles, connected and automated vehicles, and advanced infrastructure sensors will allow the collection of microscopic measures that can be used… (more)

▼ The introduction of connected vehicles, connected and automated vehicles, and advanced infrastructure sensors will allow the collection of microscopic measures that can be used in combination with macroscopic measures for better estimation of traffic safety and mobility. This dissertation examines the use of microscopic measures in combination with the usually used macroscopic measures for traffic congestion evaluation, traffic state categorization, traffic flow breakdown prediction, and estimation of traffic safety. The considered macroscopic measures are the mean speed, traffic flow rate, and occupancy. The investigated microscopic measures for the stated purpose are: standard deviations of individual vehicle’s speeds, standard deviation of vehicles’ speed, and disturbance metrics. The utilized disturbance metrics to capture the stop-and-go operations are: the number of oscillations and a measure of disturbance durations in terms of the time exposed time–to–collision (TET), which has been used in other studies as a safety surrogate measure. However, this measure of disturbance duration requires the location and speed of both the leading and following vehicles and therefore cannot be measured accurately with low sample sizes of connected vehicles (CV). Thus, this study derived a model to estimate this measure based on speed parameters. The developed model was tested using real-world trajectory data from two locations that were not used in the development of the model. Moreover, the percentage of vehicles in the platoon and the platoon size distribution were evaluated as additional indicators of congestion. The relationship between the platooning and disturbance metrics and the speed parameters were further explored. It is recognized that the parameters required to identify the platoons, such as the time headway, will not be available based on data from low market penetrations of CV. Thus, a model was developed that utilize other measures for the estimation of the platooning measures at lower CV market penetrations. For the purpose of traffic state recognition and prediction, first, the study used a hybrid of two unsupervised clustering techniques to classify traffic states into “breakdown” and “non-breakdown”. The study found that adding the disturbance metrics in data clustering when identifying the traffic states will result in better traffic state recognition and traffic flow breakdown identification by capturing the disturbances in the traffic stream. The categorized traffic state was then used as a binary response to the macroscopic and microscopic measures, as features, to train supervised machine learning techniques for predicting traffic flow breakdown in the following 5-minute interval in real-time operations. The study found that utilizing disturbance and safety surrogate metrics in the real-time classification of traffic flow state increases the accuracy of prediction. Also, the study showed that the investigated disturbance metrics and associated models and thresholds are… Advisors/Committee Members: Mohammed Hadi, Albert Gan, Xia Jin, B.M. Golam Kibria.

Subjects/Keywords: Microscopic Measures; Traffic Disturbance; Surrogate Measures; Platooning; Traffic State Categorization; Traffic Flow Breakdown; Safety Measures; Clustering Analysis; Machine Learning; Connected Vehicle Data; Civil Engineering; Transportation Engineering

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

APA (6^th Edition):

Azizi, L. (2019). Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/4319 ; FIDC008844

Chicago Manual of Style (16^th Edition):

Azizi, Leila. “Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics.” 2019. Doctoral Dissertation, Florida International University. Accessed March 04, 2021. https://digitalcommons.fiu.edu/etd/4319 ; FIDC008844.

MLA Handbook (7^th Edition):

Azizi, Leila. “Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics.” 2019. Web. 04 Mar 2021.

Vancouver:

Azizi L. Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics. [Internet] [Doctoral dissertation]. Florida International University; 2019. [cited 2021 Mar 04]. Available from: https://digitalcommons.fiu.edu/etd/4319 ; FIDC008844.

Council of Science Editors:

Azizi L. Freeway Performance Measurement in a Connected Vehicle Environment Utilizing Traffic Disturbance Metrics. [Doctoral Dissertation]. Florida International University; 2019. Available from: https://digitalcommons.fiu.edu/etd/4319 ; FIDC008844

University of Cincinnati

14. MAY, CAMERON. HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS.

Degree: MS, Engineering : Aerospace Engineering, 2005, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109166873

► The overall objective of this work was to develop an active fluidic control system that can effectively manipulate the vortex breakdown location over a highly… (more)

▼ The overall objective of this work was to develop an active fluidic control system that can effectively manipulate the vortex breakdown location over a highly swept delta wing. By moving the vortex breakdown fore or aft, a pitching moment can be induced on the delta wing without the use of any conventional control surfaces. The active control system can be incorporated into a feedback loop to input a desired pitching moment based on the real-time measured surface pressure. The type of active fluidic control system shown to be the most effective at delaying vortex breakdown was the along-core injection technique. In the previous studies using this technique, the control was an open loop system, that is, the flow field was observed and measured and then injection conditions were changed manually. The process was repeated until optimal conditions were observed. In order to move this technique closer to practical application, two important steps must be taken. The fist step is to close the control loop so that input changes can be instantly made according to the changing flow field. The second step is to simplify and optimize the control system. One advantage this control system has over conventional control surfaces is its simplicity. Conventional control surfaces employ complex and costly combinations of hydraulic and electronic components whereas the along-core injection system requires only solenoid actuators and a source of compressed air. Compressed air is readily available in the form of compressor bleed on most gas turbine engines. Other advantages of this system include elimination of drag due to deployed control surfaces and reduced radar vulnerability. A 60° delta wing model with a maximum span of 15.5 inches and a root chord of 13.5 inches was mounted in a subsonic wind tunnel. The wing is equipped with six control jets with variable azimuthal and pitch angles on the top surface approximately beneath the vortex core. A thorough optimization process was completed measuring static pressure to determine vortex breakdown location. Other variables in addition to azimuthal and pitch angles were injection momentum, frequency, and duty cycle. Measuring dynamic pressure, that is pressure fluctuation due to vortex shedding and pulsed injection, was also necessary to the development of a control algorithm. Dynamic pressure was measured at four chord-wise locations with uniform and randomly modulated duty cycles in order to ascertain duty cycle sensitivity on the systems overall effectiveness. Advisors/Committee Members: Gutmark, Ephraim (Advisor).

Subjects/Keywords: Engineering, Aerospace; Delta Wing; Flight Control; Flow Control; Vortex Breakdown

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APA (6^th Edition):

MAY, C. (2005). HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109166873

Chicago Manual of Style (16^th Edition):

MAY, CAMERON. “HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS.” 2005. Masters Thesis, University of Cincinnati. Accessed March 04, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109166873.

MLA Handbook (7^th Edition):

MAY, CAMERON. “HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS.” 2005. Web. 04 Mar 2021.

Vancouver:

MAY C. HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS. [Internet] [Masters thesis]. University of Cincinnati; 2005. [cited 2021 Mar 04]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109166873.

Council of Science Editors:

MAY C. HIGH ANGLE OF ATTACK FLIGHT CONTROL OF DELTA WING AIRCRAFT USING VORTEX ACTUATORS. [Masters Thesis]. University of Cincinnati; 2005. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109166873

Delft University of Technology

15. Donohoe, S.R. Vortex flow and Vortex breakdown above delta wing in high subsonic flow.

Degree: 1996, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e

Subjects/Keywords: aerodynamics; delta wing; vortex flow; flow visualization; schlieren; vortex breakdown; tansonic flow; wind tunnel testing; five-holve probe

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APA (6^th Edition):

Donohoe, S. R. (1996). Vortex flow and Vortex breakdown above delta wing in high subsonic flow. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e

Chicago Manual of Style (16^th Edition):

Donohoe, S R. “Vortex flow and Vortex breakdown above delta wing in high subsonic flow.” 1996. Doctoral Dissertation, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e.

MLA Handbook (7^th Edition):

Donohoe, S R. “Vortex flow and Vortex breakdown above delta wing in high subsonic flow.” 1996. Web. 04 Mar 2021.

Vancouver:

Donohoe SR. Vortex flow and Vortex breakdown above delta wing in high subsonic flow. [Internet] [Doctoral dissertation]. Delft University of Technology; 1996. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e.

Council of Science Editors:

Donohoe SR. Vortex flow and Vortex breakdown above delta wing in high subsonic flow. [Doctoral Dissertation]. Delft University of Technology; 1996. Available from: http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; urn:NBN:nl:ui:24-uuid:575b510c-8894-4dfb-96d3-521be883580e ; http://resolver.tudelft.nl/uuid:575b510c-8894-4dfb-96d3-521be883580e

16. Silva, Guilherme Araújo Lima da. Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos.

Degree: PhD, Engenharia Mecânica de Energia de Fluidos, 2009, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27032009-082825/ ;

►

Há a necessidade de prevenir formação de gelo nas asas e nos estabilizadores de aeronaves, pois as formas de gelo podem causar a degradação do… (more)

▼

Há a necessidade de prevenir formação de gelo nas asas e nos estabilizadores de aeronaves, pois as formas de gelo podem causar a degradação do desempenho aerodinâmico, o aumento de peso, bem como dificuldades de controle e manobra que, em casos críticos, leva a uma diminuição da margem de segurança operacional. Quando as aeronaves atravessam nuvens com gotículas de água sub-resfriadas, ou seja, em equilíbrio metaestável, o crescimento de gelo ocorre nas superfícies não protegidas. Usualmente, os sistemas antigelo térmicos de aerofólios são projetados, desenvolvidos e certificados com o auxílio de programas de simulação numérica. O presente trabalho visa desenvolver e implementar um modelo matemático para prever a transferência de calor e massa no escoamento bidimensional bifásico em torno de aerofólios de uso aeronáuticos, equipados com sistema de antigelo térmico operando em regime permanente. Em condições de formação de gelo, é necessário aquecer o bordo de ataque e controlar a temperatura da região protegida para que não ocorra formação de gelo. O sistema de aquecimento compensa os efeitos do resfriamento imposto principalmente pelos mecanismos acoplados de evaporação e transferência de calor por convecção, que são causados pelo escoamento do ar carregado de gotículas sub-resfriadas e pelo escoamento da água líquida residual. O modelo deverá estimar a distribuição de temperaturas de superfície e o coeficiente de transferência de calor com precisão ao uso em aplicações aeronáuticas. O presente trabalho implementou novos submodelos para: 1) estimar a molhabilidade da superfície do aerofólio por meio de um modelo matemático para caracterizar o escoamento da água líquida residual na padrão de filme e de filetes; 2) avaliar o comportamento dinâmico e térmico da camada-limite laminar e turbulenta por meio de análises integral e diferencial, que considera efeitos do gradiente de pressão, da transição laminar-turbulenta, da transpiração e da não uniformidade de temperatura da superfície e 3) estimar o início e o término da região de transição laminar-turbulenta. O presente trabalho seguiu um processo de desenvolvimento de código numérico que: verificou os resultados de cada submodelo separadamente para depois implementados no modelo do antigelo; validou os resultados da simulação de desempenho do sistema antigelo com os novos submodelos implementados. Os resultados obtidos foram considerados satisfatórios para o modelo do antigelo que utilizou os submodelos de ruptura de filme e formação de filetes pelo critério da Energia Mecânica Total Mínima, de camada-limite diferencial compressível e de previsão da transição laminar-turbulenta por correlações algébricas, que consideraram efeitos do gradiente de pressão e do nível de turbulência ao longe.

It is required to prevent ice accretion on wings and horizontal stabilizers because it may cause aerodynamic performance degradation, weight increase, flight control difficulties and, in critical cases, may lead to operational safety margins reduction. When aircraft flies through…

Advisors/Committee Members: Silvares, Otavio de Mattos.

Subjects/Keywords: Aerodinâmica de aeronaves (simulação); Aircraft simulation; Anti-Ice; Boundary layer; Escoamento bifásico; Film breakdown; Heat transfer; Icing; Laminar turbulent transition; Mass transfer; Rivulets formation; Transferência de calor; Transferência de massa; Two-phase flow

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APA (6^th Edition):

Silva, G. A. L. d. (2009). Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27032009-082825/ ;

Chicago Manual of Style (16^th Edition):

Silva, Guilherme Araújo Lima da. “Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos.” 2009. Doctoral Dissertation, University of São Paulo. Accessed March 04, 2021. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27032009-082825/ ;.

MLA Handbook (7^th Edition):

Silva, Guilherme Araújo Lima da. “Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos.” 2009. Web. 04 Mar 2021.

Vancouver:

Silva GALd. Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos. [Internet] [Doctoral dissertation]. University of São Paulo; 2009. [cited 2021 Mar 04]. Available from: http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27032009-082825/ ;.

Council of Science Editors:

Silva GALd. Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos. [Doctoral Dissertation]. University of São Paulo; 2009. Available from: http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27032009-082825/ ;

Pontifical Catholic University of Rio de Janeiro

17. DENISE DINIZ SOUTO LIMA. [en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA.

Degree: 2019, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37993

►

[pt] Uma preocupação constante referente às operações de reinício de escoamento em poços produtores de óleo é a previsibilidade da mínima pressão necessária para iniciar… (more)

▼

[pt] Uma preocupação constante referente às operações de reinício de escoamento em poços produtores de óleo é a previsibilidade da mínima pressão necessária para iniciar o fluxo após uma parada de produção. Tal pressão se refere àquela que promove tensões de cisalhamento junto à parede do duto que superam o valor da tensão limite de escoamento do referido fluido. A necessidade de desenvolvimento de diferentes tipos de campos de petróleo ao redor do mundo tem promovido discussões sobre importantes aspectos de garantia de escoamento dos fluidos, especialmente em cenários de produção em águas ultra-profundas. Nesses casos, quando o fluido apresenta valores elevados para a temperatura mínima de aparecimento de cristais (TIAC) ou ainda para a tensão limite de escoamento, o procedimento de repartida de poço após uma parada de produção pode representar um problema. Em geral, os modelos tixotrópicos utilizados na avaliação de reinício do escoamento são definidos por uma equação constitutiva baseada no modelo de Bingham, na qual a tensão de cisalhamento depende do grau de estruturação do fluido no interior do duto, representado por um parâmetro adimensional positivo (lambda). A evolução deste parâmetro no tempo é governada por uma equação constitutiva que considera um termo de construção e um termo de quebra do gel. Este trabalho tem como principal objetivo avaliar o comportamento do reinício da produção através da variação destes parâmetros/termos segundo modelos tixotrópicos específicos (Houska e SMT) e a representatividade dos resultados de simulação quando comparados aos dados experimentais.

[en] The main concern regarding to the restart operations for production wells in oil and gas systems is the forecast of minimum pressure needed to overcome the gel strength, i.e. the pressure which generates a wall stress higher than the yield stress of the gelled oil. The petroleum accumulations around the world have raised big issues regarding flow assurance aspects, especially in some ultra-deep water scenarios. In these cases, when the oil presents unusual high values for the Wax Appearance Temperature (WAT) and even for the yield stress, the flow restart procedure can be an issue, after shutdown times of the oil production. Usually, the thixotropic models applied for start-up flow are defined by a Bingham-like stress equation whose yield stress depends on a structure parameter (lambda), following Houska assumptions. This parameter is a non-negative scalar number that represents the structuring level of the material inside the pipeline. The structure parameter is governed by an evolution equation that considers a build-up term and a breakdown term. The main objective of this work is to evaluate the relationship between the parameters of the constitutive equations for Houska and SMT models (dimensionless coefficients of the evolution equations for the structure parameter) and the representativeness of the simulation results obtained by these models, regarding times for the production stabilization after a restart, delay times…

Advisors/Committee Members: PAULO ROBERTO DE SOUZA MENDES.

Subjects/Keywords: [pt] SIMULACAO; [en] SIMULATION; [pt] DADOS EXPERIMENTAIS; [en] EXPERIMENTAL DATA; [pt] TENSAO LIMITE; [en] YIELD STRESS; [pt] GELIFICACAO; [en] GELLATION; [pt] REPARTIDA DE ESCOAMENTO; [en] FLOW OUTLET; [pt] ESTRUTURACAO; [en] STRUCTURING; [pt] TERMO DE CONSTRUCAO; [en] TERM OF CONSTRUCTION; [pt] TERMO DE QUEBRA; [en] BREAKDOWN TERM

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

APA (6^th Edition):

LIMA, D. D. S. (2019). [en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37993

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):

LIMA, DENISE DINIZ SOUTO. “[en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA.” 2019. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed March 04, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37993.

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

MLA Handbook (7^th Edition):

LIMA, DENISE DINIZ SOUTO. “[en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA.” 2019. Web. 04 Mar 2021.

Vancouver:

LIMA DDS. [en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. [cited 2021 Mar 04]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37993.

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

Council of Science Editors:

LIMA DDS. [en] STARTUP FLOW OF GELLED CRUDES AFTER A SHUTDOWN: COMPARISON BETWEEN SIMULATIONS AND EXPERIMENTAL DATA. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37993

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

Curtin University of Technology

18. Lim, David Eng Chung. Investigation in to ramp queues vs. freeway queues on ramp metered freeways .

Degree: 2010, Curtin University of Technology

URL: http://hdl.handle.net/20.500.11937/1676

► Freeways and highways form an integral part of any road network system demanding significant quantities of resources to plan and construct. During times of congestion… (more)

▼ Freeways and highways form an integral part of any road network system demanding significant quantities of resources to plan and construct. During times of congestion and flow breakdown forms of traffic management are required to maintain the efficiency, reliability and safety of these high asset road facilities. Here within lies the responsibilities of traffic engineering professionals. The lack of adequate maintenance and management of any urban road network system hinders economic development and quality of life.Ramp metering is an active traffic management system implemented on high speed, free flowing facilities such as freeways and highways. This form of intelligent transport system has been applied to freeways throughout the world to regulate the intensity and demand proportion of freeway inflow during peak demand periods. The primary goal is to manage the existing roadway to operate at maximum efficiency. Main Roads Western Australia, the governing road authority in Western Australia is currently in a position to investigate the suitability of ramp metering on Western Australia's freeways.This research demonstrates how traffic movement and interaction can be mapped and characterised to identify forms of traffic flow breakdown that ramp metering has the potential to address. This research also documents the required components of ramp metering, how it should operate and the potential this active management system has to be applied over a system wide road network infrastructure.The Mitchell Freeway southbound direction undergoes significant forms of congestion and traffic flow breakdown during the morning peak period. A traffic characteristic of the Mitchell Freeway was developed to make an evaluation for the suitability of ramp metering as an effective management system. An analytical comparison between current freeway queues and theoretical on-ramp queues provided indication that the congestion and flow breakdown currently observed had the potential to be managed through ramp metering, ensuring the future sustainability of this vital freeway for the city of Perth, Western Australia.

Subjects/Keywords: freeways; maintenance; congestion; Mitchell Freeway; interaction; traffic movement; road network system; highways; traffic engineering professionals; ramp metering; flow breakdown

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APA (6^th Edition):

Lim, D. E. C. (2010). Investigation in to ramp queues vs. freeway queues on ramp metered freeways . (Thesis). Curtin University of Technology. Retrieved from http://hdl.handle.net/20.500.11937/1676

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):

Lim, David Eng Chung. “Investigation in to ramp queues vs. freeway queues on ramp metered freeways .” 2010. Thesis, Curtin University of Technology. Accessed March 04, 2021. http://hdl.handle.net/20.500.11937/1676.

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

MLA Handbook (7^th Edition):

Lim, David Eng Chung. “Investigation in to ramp queues vs. freeway queues on ramp metered freeways .” 2010. Web. 04 Mar 2021.

Vancouver:

Lim DEC. Investigation in to ramp queues vs. freeway queues on ramp metered freeways . [Internet] [Thesis]. Curtin University of Technology; 2010. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/20.500.11937/1676.

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

Council of Science Editors:

Lim DEC. Investigation in to ramp queues vs. freeway queues on ramp metered freeways . [Thesis]. Curtin University of Technology; 2010. Available from: http://hdl.handle.net/20.500.11937/1676

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

Louisiana State University

19. De, Ashoke. Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines.

Degree: PhD, Mechanical Engineering, 2009, Louisiana State University

URL: etd-01282010-093746 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3802

► An artificially Thickened Flame (TF) approach based on LES framework is used to model the turbulent premixed combustion in gas turbine combustors. A number of… (more)

▼ An artificially Thickened Flame (TF) approach based on LES framework is used to model the turbulent premixed combustion in gas turbine combustors. A number of variants of the Thickened Flame approach including a modified version of TF model have been studied in details. In the TF model, the flame front is artificially thickened to resolve on LES computational grid. With this approach, reaction rate modeling does not require any ad-hoc closure assumptions. However, suitable modifications have to be made to compensate for flame thickening. To verify the predictive capability of the models, a stoichiometric methane-air flame on Bunsen burner type geometry has been simulated and the TF model predictions compared with experimental data as well as with other model predictions. As a part of this research, turbulent flow over a backward facing step, isothermal swirling flow in a confined geometry have also been studied and predictions are compared with experiments. Good agreement with data is obtained that validates the LES model used. The validated LES based TF model is used to investigate flashback behavior in hydrogen enriched premixed flame in a swirled combustor. Firstly, non-reacting and reacting flows with natural gas are studied, followed by hydrogen enriched combustion. In general, the LES predictions for both reacting and non-reacting cases are found to be in good agreement with measurements. In non-reacting flow conditions, the recirculation zones (WRZ, CRZ and CTRZ) are clearly observed, especially at high Reynolds number. Moreover, the observations reveal that higher combustibility of hydrogen causes Combustion Induced Vortex Breakdown driven flashback due to complex interaction of chemical reaction in swirled burner, resulting in faster flame propagation into the upstream mixing tube. In particular, combined effect of baroclinic production and vortex stretching accelerates the upstream flame propagation in hydrogen-enriched mixture, while only methane shows stable behavior. Further, the effect of swirl strength, premixedness and geometry has also been studied on flashback behavior of hydrogen enriched mixture. Flame flashback is always observed at higher swirl strength irrespective of level of premixedness and burner geometry, whereas the premixed systems exhibit stable behavior while operating under lower swirl strength.

Subjects/Keywords: large eddy simulation; vortex breakdown; flame wrinkling; swirling flow; turbulent premixed combustion; flashback; artificially thickened flame model

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

APA (6^th Edition):

De, A. (2009). Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-01282010-093746 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3802

Chicago Manual of Style (16^th Edition):

De, Ashoke. “Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines.” 2009. Doctoral Dissertation, Louisiana State University. Accessed March 04, 2021. etd-01282010-093746 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3802.

MLA Handbook (7^th Edition):

De, Ashoke. “Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines.” 2009. Web. 04 Mar 2021.

Vancouver:

De A. Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines. [Internet] [Doctoral dissertation]. Louisiana State University; 2009. [cited 2021 Mar 04]. Available from: etd-01282010-093746 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3802.

Council of Science Editors:

De A. Large Eddy Simulation of Turbulent Premixed Combustion in Gas Turbines. [Doctoral Dissertation]. Louisiana State University; 2009. Available from: etd-01282010-093746 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3802

20. Bassiotis, Ioannis. Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους.

Degree: 2017, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/39926

► The present thesis results from a long period research in two scientific areas for the physicochemical study of various systems.The first part refers to the… (more)

▼ The present thesis results from a long period research in two scientific areas for the physicochemical study of various systems.The first part refers to the physicochemical study of materials using the modern method of the laser induced fluorescence. It was conducted in collaboration of Professor Fani Roubani- Kalantzopoulou with Dr. M. Kompitsas, head of the Laser-based Techniques and Applications Lab, at the Institute of Theoretical and Physical Chemistry of the National Hellenic Research Foundation, where exists an integrated instrumental system with lasers.In this context, the hydroxyl radical (OH) in atmospheric reaction was studied. It is an important intermediate in elementary reactions and reacts with the emitted pollutants in the atmosphere.The method LIF in conjunction with the Time Resolved analysis of the obtained spectra was employed as an analytical tool for the qualitative and quantitative determination of various pollutants in liquids. Specifically, the LIF spectra of various polycyclic hydrocarbons were studied, the identification of anthracene and pyrene in their mixture was achieved. Moreover, the LIF spectra of various products of crude oils were investigated, e.g. unleaded and super unleaded gasoline, kerosene in aquatic solutions, as well as useful results for their quantitative determination are concluded.The method of laser induced breakdown spectroscopy, which is an extension of LIF-TR, was used as an analytical method for the qualitative and quantitative determination of solid materials, e.g. steel samples, oxides and glass (andesite). All the parameters, which influence the above-mentioned method, were in detail investigated, applying appropriate methodology in order to minimize their impact. The quantitative determination of nickel (Ni), chromium (Cr) and manganese (Mn) in steel alloys was achieved, presenting good correlation results.In the second part of the thesis, the recently developed method of Reversed Flow-Inverse Gas Chromatography was used in order to study the impact of air pollutants in the surface of solids. Specifically, the mechanism of adsorption of gases on solids was investigated, as well as the possibility of synergy effects of the air pollutants, through an experimental approach for the first time.The following systems were studied:A.Aliphatic hydrocarbons C2H6, C2H4, C2H2, C3H6, C4H8, in the presence or absence of ozone (O3) on calcium oxide (CaO) and on silicon dioxide(SiO2)B.Aromatic hydrocarbons, C6H8, C7H8, in the presence or absence of nitrogen dioxide (NO2) on oxides of various metals, PbO, Cr2O3, TiO2, ZnO και σε Fe2O3C.Aliphatic hydrocarbons, C2H2, in the presence or not of nitrogen dioxide (NO2) on pentelic marbleD.Nitrogen dioxide (NO2) on titanium oxide (TiO2), on pentelic marble and on ceramicFrom the obtained results, with the use of an appropriate mathematical model, the following physicochemical quantities are determined, which are dependent on time:1.The local adsorption energy of the gas on the solid, ε,2.The local adsorption isotherm, θ,3.The…

Subjects/Keywords: Αποδόμηση υλικών με ακτινοβολία laser; Αεριοχρωματογραφία αναστρεφόμενης ροής; Επαγόμενος από laser φθορισμός; Πολυκυκλικοί αρωματικοί υδρογονάνθρακες; Κράματα χάλυβα; Laser induced breakdown spectroscopy; Reversed flow inverse gas chromatography; Polycyclic aromatic hydrocarbons; Steel Alloys; Laser induced fluorescence

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APA (6^th Edition):

Bassiotis, I. (2017). Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/39926

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):

Bassiotis, Ioannis. “Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους.” 2017. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed March 04, 2021. http://hdl.handle.net/10442/hedi/39926.

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

MLA Handbook (7^th Edition):

Bassiotis, Ioannis. “Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους.” 2017. Web. 04 Mar 2021.

Vancouver:

Bassiotis I. Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10442/hedi/39926.

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

Council of Science Editors:

Bassiotis I. Φυσικοχημική μελέτη υλικών με σύγχρονες φασματοσκοπικές και χρωματογραφικές μεθόδους. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. Available from: http://hdl.handle.net/10442/hedi/39926

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

Virginia Tech

21. Klute, Sandra M. The Development and Control of Axial Vortices over Swept Wings.

Degree: PhD, Engineering Mechanics, 1999, Virginia Tech

URL: http://hdl.handle.net/10919/29718

► The natural unsteadiness in the post-breakdown flowfield of a 75Â° sweep delta wing at 40Â° angle of attack was studied with dual and single point… (more)

▼ The natural unsteadiness in the post-breakdown flowfield of a 75Â° sweep delta wing at 40Â° angle of attack was studied with dual and single point hot-wire anemometry in the Engineering Science and Mechanics (ESM) Wind Tunnel at a Reynolds number Re = 210,000. Data were taken in five crossflow planes surrounding the wing's trailing edge. Results showed a dominant narrowband Strouhal frequency of St = 1.5 covering approximately 80% of the area with lower-intensity broadband secondary frequencies over 15% of that region. Cross-correlations between a fixed and traversing wire were calculated and phase and coherences mapped to determine the convection speed and trajectory of the helical mode instability. High-speed Particle Image Velocimetry (PIV) was conducted over a 75Â° sweep delta wing at 40Â° angle of attack in the ESM Water Tunnel II at Re = 45,000. Data were taken along the axis of the vortex in the breakdown flowfield at a speed of 0.1% of the convective time scale of the flow. Animations of instantaneous streamlines and velocity vectors revealed the impression of a helically spiralling vortex core on the measurement plane. Spectral analysis of the PIV data showed reduced frequencies which confirmed those found with the single-point measurements made in the ESM Wind Tunnel. The effect of four novel control surfaces on the breakdown flowfield of the delta wing was studied with surface pressure measurements along the axis of the vortex in the ESM Wind Tunnel. The apex flap was found effective and delayed vortex breakdown by 8Â° for a fixed wing. The flowfield was characterized over the delta wing executing a pitch-up maneuver at a reduced frequency of 0.06. Surface pressure measurements were taken in the ESM Wind Tunnel and Laser Doppler Velocimetry (LDV) was employed in the ESM Water Tunnel I as both the unmodified wing and then the wing with an apex flap deployed at an optimal angle b = 15Â° executed the pitch-up. Both sets of data confirmed the hysteresis of the flowfield. The LDV data, taken in two crossflow planes throughout the maneuver, showed an asymmetric breakdown development. As a practical extension of the study of the breakdown wake flowfield, hot-wire measurements were made over an F/A-18 model to determine the spectral characteristics of the flowfield. Three-dimensional vortex interactions were investigated with helium bubble flow visualization in the VPI Stability Tunnel. Advisors/Committee Members: Telionis, Demetri P. (committeechair), Ragab, Saad A. (committee member), Hendricks, Scott L. (committee member), Renardy, Yuriko Y. (committee member), Hajj, Muhammad R. (committee member), Dowling, Norman E. (committee member).

Subjects/Keywords: Particle Image Velocimetry; control surfaces; forebody vortices; F/A-18 vortex interaction; delta wing; vortex breakdown; flow periodicity

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

APA (6^th Edition):

Klute, S. M. (1999). The Development and Control of Axial Vortices over Swept Wings. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29718

Chicago Manual of Style (16^th Edition):

Klute, Sandra M. “The Development and Control of Axial Vortices over Swept Wings.” 1999. Doctoral Dissertation, Virginia Tech. Accessed March 04, 2021. http://hdl.handle.net/10919/29718.

MLA Handbook (7^th Edition):

Klute, Sandra M. “The Development and Control of Axial Vortices over Swept Wings.” 1999. Web. 04 Mar 2021.

Vancouver:

Klute SM. The Development and Control of Axial Vortices over Swept Wings. [Internet] [Doctoral dissertation]. Virginia Tech; 1999. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10919/29718.

Council of Science Editors:

Klute SM. The Development and Control of Axial Vortices over Swept Wings. [Doctoral Dissertation]. Virginia Tech; 1999. Available from: http://hdl.handle.net/10919/29718

Queensland University of Technology

22. Kelson, Neil. Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence.

Degree: 2000, Queensland University of Technology

URL: http://eprints.qut.edu.au/37083/

► Micropolar and RNG-based modelling of industrially relevant boundary layer and recirculating swirling flows is described. Both models contain a number of adjustable parameters and auxiliary… (more)

Subjects/Keywords: Boundary layer; Fluid dynamics; micropolar flow; renormalisation group theory; similarity solutions; boundary layer; pertubation analysis; newtonian flow; swirling flow; turbulence model; vortex breakdown; computational fluid dynamics; thesis; doctoral

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

APA (6^th Edition):

Kelson, N. (2000). Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence. (Thesis). Queensland University of Technology. Retrieved from http://eprints.qut.edu.au/37083/

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):

Kelson, Neil. “Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence.” 2000. Thesis, Queensland University of Technology. Accessed March 04, 2021. http://eprints.qut.edu.au/37083/.

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

MLA Handbook (7^th Edition):

Kelson, Neil. “Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence.” 2000. Web. 04 Mar 2021.

Vancouver:

Kelson N. Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence. [Internet] [Thesis]. Queensland University of Technology; 2000. [cited 2021 Mar 04]. Available from: http://eprints.qut.edu.au/37083/.

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

Council of Science Editors:

Kelson N. Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence. [Thesis]. Queensland University of Technology; 2000. Available from: http://eprints.qut.edu.au/37083/

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

Indian Institute of Science

23. Shankar Kumar, B. A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena.

Degree: MSc Engg, Faculty of Engineering, 2010, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/729

► Vortex breakdown is an important phenomenon observed in swirling flows involving the development of a stagnation point on the axis of the vortex followed by… (more)

▼ Vortex breakdown is an important phenomenon observed in swirling flows involving the development of a stagnation point on the axis of the vortex followed by a region of recirculation when the swirl increases beyond a particular level. It has been studied extensively over past 50 years and various theories have been proposed to explain its various aspects. However, a single model explaining all the aspects together is yet to emerge. Numerical simulations of breakdown have been performed using a variety of grid-based as well as vortex methods. Vortex methods are a Lagrangian alternative to grid-based methods wherein the motion of the vorticity is determined by the local fluid velocity convection, with models for viscous effects when considered. The fluid velocity is obtained from the vorticity field. Only the rotational regions of the flow need to be considered leading to significant economy of computational effort for simulations of vorticity dominated flows, such as vortex breakdown. The inviscid vortex filament method has been used to simulate several aspects of the vortex breakdown phenomenon. The vortex filament method however, cannot easily simulate viscous effects. To simulate the viscous effects the viscous vortex particle method needs to be used. This work was intended to be a first step towards this end by initially evaluating the effectiveness of the inviscid version of the vortex particle method in simulating the breakdown phenomenon. The inviscid vortex particle method was found to satisfactorily simulate most qualitative aspects involved in the formation of vortex breakdown such as the retardation of axial velocity along centerline, radial swelling of the vortex core, formation of stagnation points, creation of azimuthal vorticity gradient from axial vorticity gradient and the turning of vortex lines along with the formation of a bubble-like structure with recirculating flow within. The effect of a wall placed adjacent to the vortex core was simulated by using image vortices. The wall was not found to influence the location of breakdown. However, the initiation of the spiral mode was found to occur earlier when a wall was present. For a quantitative assessment, a simulation of the experimental results of Faler and Leibovich (1978) was attempted. The simulation managed to predict the location of the breakdown and the extent of the bubble. The shape and height of the bubble obtained however were not in accord with the experimental observations. A single vortical cell was obtained in the interior of the bubble. Advisors/Committee Members: Mathew, Joseph (advisor).

Subjects/Keywords: Air Flow - Fluid Dynamics; Vortex Particle Method; Vortex Breakdown; Vortex Rings - Simulation; Vortex - Dynamics; Vortex Core; Single Filament Ring; Multi-filament Ring; Aeronautics

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

APA (6^th Edition):

Shankar Kumar, B. (2010). A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/729

Chicago Manual of Style (16^th Edition):

Shankar Kumar, B. “A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena.” 2010. Masters Thesis, Indian Institute of Science. Accessed March 04, 2021. http://etd.iisc.ac.in/handle/2005/729.

MLA Handbook (7^th Edition):

Shankar Kumar, B. “A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena.” 2010. Web. 04 Mar 2021.

Vancouver:

Shankar Kumar B. A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena. [Internet] [Masters thesis]. Indian Institute of Science; 2010. [cited 2021 Mar 04]. Available from: http://etd.iisc.ac.in/handle/2005/729.

Council of Science Editors:

Shankar Kumar B. A Study Of A Vortex Particle Method For Vortex Breakdown Phenomena. [Masters Thesis]. Indian Institute of Science; 2010. Available from: http://etd.iisc.ac.in/handle/2005/729

24. Γιανναδάκης, Αθανάσιος. Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής.

Degree: 2008, University of Patras; Πανεπιστήμιο Πατρών

URL: http://hdl.handle.net/10442/hedi/17999

► In this work the isothermal flow field generated by the interaction of an internal swirling jet with an external parallel flow is experimentally investigated with… (more)

▼ In this work the isothermal flow field generated by the interaction of an internal swirling jet with an external parallel flow is experimentally investigated with the use of 2D Digital Particle Image Velocimetry. Swirl is produced through tangential injection of air. Parametric change of inlet flow rates (constant tangential injection with change of annular flow and vice versa) is being considered in order to study the mean and turbulent flow field. Coaxial swirling jets are widely used in combustion systems as they enhance fuel and oxidant mixing and flame stabilization. Amongst well known features of introducing swirl in jet flows (increase of jet growth, entrainment and decay), highly swirling jets have been studied in combustion configurations as they impose radial and axial pressure gradients generating an internal toroidal recirculation zone, a phenomenon known as “vortex breakdown”. The complex structure of vortex breakdown has been a challenging issue for experimentalists over the past few decades emphasizing on its effect on aerodynamic and mixing attributes of combustion flow fields. Focusing on the study of coaxial swirling jets, rather limited data has been presented up to now, regarding the topology and turbulent attributes of the flow field created by coaxial jets with inner and/or outer swirl. Following previous work on coaxial swirling jets with inner or outer swirl and coaxial jets without swirl which lead to recirculation, a sufficient need for a deeper understanding of the physical mechanisms developing in such complex flow fields, comes up. This Thesis stands as an attempt to present the main features of such a complex flow field, which results from the interaction of a typical swirling jet undergoing “vortex breakdown” with an outer annular flow with “back step flow” characteristics. An analysis of the mean and turbulent flow statistics is presented, correlating flow field mechanisms with the three dimensional shear layer characteristics and the topology of the recirculating flow field (recirculation bubble, vortex ring). Research on vortex breakdown phenomena has led to a parallel research on the critical parameters that could determine whether vortex breakdown will occur. The definition of non-dimensional parameters (Swirl/ Rossby number etc), mainly based on the correlation of axial and azimuthal velocities or momenta, has been an issue of scientific interest that has often led to different approaches and criteria for vortex breakdown prediction. Additionally, it is seen through literature review that predicting vortex breakdown is not by itself adequate to characterize the mean and turbulent features of the recirculating flow field. In the case of coaxial jets, with or without swirl, previous studies have shown that the flow field created is strongly affected not only by the velocity or mass flow ratio of the jets but also by the absolute values of the jets’ velocities or the velocity jump between the two streams. For the case of coaxial swirling jets it is apparent that the interaction…

Subjects/Keywords: Περιδινούμενες δέσμες εκροής; Ομοαξονικές δέσμες; Αποδόμηση αξονικού μακροστροβίλου; Ψηφιακή ταχυμετρίας απεικόνισης τροχιοδεικτικών σωματιδίων; Swirling jets; Coaxial flow; Vortex breakdown; Digital particle image velocimetry

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

APA (6^th Edition):

Γιανναδάκης, . �. (2008). Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής. (Thesis). University of Patras; Πανεπιστήμιο Πατρών. Retrieved from http://hdl.handle.net/10442/hedi/17999

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):

Γιανναδάκης, Αθανάσιος. “Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής.” 2008. Thesis, University of Patras; Πανεπιστήμιο Πατρών. Accessed March 04, 2021. http://hdl.handle.net/10442/hedi/17999.

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

MLA Handbook (7^th Edition):

Γιανναδάκης, Αθανάσιος. “Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής.” 2008. Web. 04 Mar 2021.

Vancouver:

Γιανναδάκης �. Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής. [Internet] [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2008. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10442/hedi/17999.

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

Council of Science Editors:

Γιανναδάκης �. Συστήματα καύσης με περιδίνιση: επίδραση εξωτερικής παράλληλης ροής σε μια περιδινούμενη δέσμη εκροής. [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2008. Available from: http://hdl.handle.net/10442/hedi/17999

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

University of Lund

25. Wang, Ping. Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion.

Degree: 2005, University of Lund

URL: https://lup.lub.lu.se/record/24304 ; https://portal.research.lu.se/ws/files/4771549/26506.pdf

► With the increasing concerns about our environment and human health, more and more stringent emission limits have been specified. These adopted and still coming emission… (more)

▼ With the increasing concerns about our environment and human health, more and more stringent emission limits have been specified. These adopted and still coming emission limits require and promote more accurate, less experiential methods to design and develop the combustors. In this thesis, computation fluid dynamics (CFD) technology, based on large eddy simulation (LES) and level set G-equation methods, is applied to study the turbulent premixed combustion related problems. This thesis work consists of three parts. First, this thesis studies the flow structures of isothermal turbulent swirling flows in a dump combustor related geometry, and compared the simulation results with corresponding experimental data. The aims are to gain deeper understanding of the flow and turbulence structures in dump combustors and to examine the capability of LES for prediction of turbulent swirling flows. With appropriate inflow, outflow boundary conditions, and fine grid resolution, LES successfully simulates the vortex breakdown, and the anisotropic turbulence structures for all the swirl numbers considered. Large-scale motion of the vortex core center, i.e. the so-called precessing vortex core (PVC) phenomenon, is predicted. The PVC is found to rotate around the combustor axis at a frequency about 18?25 Hz (Strouhal number about 0.17?0.4). To model the turbulent premixed combustion processes, a level set G-equation is first derived in the LES framework. Some aspects of the level set G-equation have also been addressed in detail in this dissertation. This level set G-equation combined with the stationary flamelet library is used to simulate a lean premixed propane/air flame in a jet engine afterburner. The results indicate that the fluctuation of the flame surface, which is responsible for the broadening of the time averaged mean flame brush by turbulence, depends on the large resolved turbulence eddies. Time averaged mean flow velocity, temperature and major species concentrations also mainly depend on these large scale resolved eddies. Contrarily, the unresolved subgrid scale (SGS) eddies mainly contribute to the wrinkling at the SGS level and play an important role in the enhancement of the propagation speed of the resolved flame front. In addition, the spatially filtered intermediate species such as CO strongly depends on the small SGS eddies. Further, the effect of subgrid scale eddies on the wrinkling of premixed turbulent flame is studied using a so-called h-equation, in which the flow field is a prescribed shear flow field with eddies of different scales. It is shown that the effect of subgrid eddies on the wrinkling of flame surface decreases monotonically with the LES filter size; however, the decrease rate strongly depends on the filter size. This implies that, if one wants to resolve most of the flame wrinkling, rather fine grid resolution and filter size should be used.

Subjects/Keywords: Fluid Mechanics and Acoustics; fluid dynamics; Gases; flamelet model; flame wrinkle; large eddy simulation; vortex breakdown; turbulent premixed combustion; level set G-equation; swirling flow; plasmas; Gaser; fluiddynamik; plasma; Energy research; Energiforskning

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

APA (6^th Edition):

Wang, P. (2005). Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/24304 ; https://portal.research.lu.se/ws/files/4771549/26506.pdf

Chicago Manual of Style (16^th Edition):

Wang, Ping. “Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion.” 2005. Doctoral Dissertation, University of Lund. Accessed March 04, 2021. https://lup.lub.lu.se/record/24304 ; https://portal.research.lu.se/ws/files/4771549/26506.pdf.

MLA Handbook (7^th Edition):

Wang, Ping. “Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion.” 2005. Web. 04 Mar 2021.

Vancouver:

Wang P. Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion. [Internet] [Doctoral dissertation]. University of Lund; 2005. [cited 2021 Mar 04]. Available from: https://lup.lub.lu.se/record/24304 ; https://portal.research.lu.se/ws/files/4771549/26506.pdf.

Council of Science Editors:

Wang P. Large Eddy Simulation of Turbulent Swirling Flows and Turbulent Premixed Combustion. [Doctoral Dissertation]. University of Lund; 2005. Available from: https://lup.lub.lu.se/record/24304 ; https://portal.research.lu.se/ws/files/4771549/26506.pdf

Brno University of Technology

26. Komárek, Filip. Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/60513

► This bachelor's thesis deals with measurement of liquid insulators. Mainly it deals with diagnostic tests of transformer oil. Diagnostic tests are needed to identify oil… (more)

Subjects/Keywords: Kvapalinové izolanty; transformátorový olej; silikónový olej; minerálny olej; degradačné deje; diagnostické skúšky; elektrická pevnosť; stratový činiteľ; kapacita oleja; elektrické prierazy; sadze; nečistoty v oleji; pohyb nečistôt v oleji; prúdenie oleja; elektrické pole; The liquid insulators; transformer oil; silicon oil; mineral oil; degradation happens; the diagnostic tests; electric strength; dissipation factor; the oil capacity; electrical breakdown; carbon black; impurities in oil; the movement of impurities in the oil; the oil flow; electric field

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Komárek, F. (2019). Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/60513

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):

Komárek, Filip. “Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/60513.

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

MLA Handbook (7^th Edition):

Komárek, Filip. “Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage.” 2019. Web. 04 Mar 2021.

Vancouver:

Komárek F. Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/60513.

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

Council of Science Editors:

Komárek F. Degradace kapalných izolantů pro vysoké napětí: Degradation of liquid insulators for high voltage. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/60513

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

Open Access Theses and Dissertations