You searched for subject:(rheology).
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University of Georgia
1.
Liang, Joshua.
Rheology of pectin solutions containing montmorillonite nanoparticles.
Degree: MS, Food Science, 2008, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/liang_joshua_y_200812_ms 
► Commercial high and low-methoxy pectins were blended with seven different modified montmorillonite clays and the resulting solutions were characterized by dynamic and transient rheology utilizing…
(more)
▼ Commercial high and low-methoxy pectins were blended with seven different modified montmorillonite clays and the resulting solutions were characterized by dynamic and transient
rheology utilizing Couette geometry. Pectin solutions without clay nanoparticles served as control. In all cases, montorillonite clay-pectin dispersions possessed altered rheological properties, with more highly hydrophilic nanoparticles imparting higher moduli and stress values, along with more highly shear thinning characteristics, while clays with a more hydrophobic modification imparted higher moduli and stress values to a lesser degree, and tended to cause a more Newtonian-like flow. These results are coupled with NMR relaxometry and ζ-potential, providing a more compete picture of the properties of the pectin/montmorillonite dispersions. Particle size varied in the pectin/clay dispersions; however, the zeta potential was nearly invariant with and without clay, regardless of clay modification. T2 spin-spin relaxometry tests showed a trend in which the hydrophilic samples had shorter relaxation time than the hydrophobic samples.
Advisors/Committee Members: Jake Mulligan.
Subjects/Keywords: Rheology
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APA (6th Edition):
Liang, J. (2008). Rheology of pectin solutions containing montmorillonite nanoparticles. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/liang_joshua_y_200812_ms
Chicago Manual of Style (16th Edition):
Liang, Joshua. “Rheology of pectin solutions containing montmorillonite nanoparticles.” 2008. Masters Thesis, University of Georgia. Accessed February 17, 2020.
http://purl.galileo.usg.edu/uga_etd/liang_joshua_y_200812_ms.
MLA Handbook (7th Edition):
Liang, Joshua. “Rheology of pectin solutions containing montmorillonite nanoparticles.” 2008. Web. 17 Feb 2020.
Vancouver:
Liang J. Rheology of pectin solutions containing montmorillonite nanoparticles. [Internet] [Masters thesis]. University of Georgia; 2008. [cited 2020 Feb 17].
Available from: http://purl.galileo.usg.edu/uga_etd/liang_joshua_y_200812_ms.
Council of Science Editors:
Liang J. Rheology of pectin solutions containing montmorillonite nanoparticles. [Masters Thesis]. University of Georgia; 2008. Available from: http://purl.galileo.usg.edu/uga_etd/liang_joshua_y_200812_ms
Montana Tech
2.
Granzow, Glen David.
An Investigation of Viscosity Using Measured Velocities on Helheim Glacier.
Degree: MS, 2013, Montana Tech
URL: https://scholarworks.umt.edu/etd/4184
► Using recent measurements of the velocity of ice on the surface of Helheim Glacier, located on the south-east coast of Greenland, the variation of viscosity,…
(more)
▼ Using recent measurements of the velocity of ice on the surface of Helheim Glacier, located on the south-east coast of Greenland, the variation of viscosity, a material property of the ice, is investigated.
The investigation focuses on determining the value of a parameter in Glen's flow law, a constitutive equation widely used in numerical models of ice sheets.
Three different approaches are used:
(1) Finite differences are used in a direct approach,
(2) A finite element model is used in an approach involving an inverse problem, and
(3) Nonlinear least squares fits of the velocity are used.
The parameter focused on, the exponent in Glen's flow law, is assigned a value of three in most ice sheet models but the results presented in this thesis suggest that the behavior of ice (at least that in the fast moving portion of Helheim Glacier) might be more accurately modeled using a significantly smaller value, 1.6.
Subjects/Keywords: rheology
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APA (6th Edition):
Granzow, G. D. (2013). An Investigation of Viscosity Using Measured Velocities on Helheim Glacier. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/4184
Chicago Manual of Style (16th Edition):
Granzow, Glen David. “An Investigation of Viscosity Using Measured Velocities on Helheim Glacier.” 2013. Masters Thesis, Montana Tech. Accessed February 17, 2020.
https://scholarworks.umt.edu/etd/4184.
MLA Handbook (7th Edition):
Granzow, Glen David. “An Investigation of Viscosity Using Measured Velocities on Helheim Glacier.” 2013. Web. 17 Feb 2020.
Vancouver:
Granzow GD. An Investigation of Viscosity Using Measured Velocities on Helheim Glacier. [Internet] [Masters thesis]. Montana Tech; 2013. [cited 2020 Feb 17].
Available from: https://scholarworks.umt.edu/etd/4184.
Council of Science Editors:
Granzow GD. An Investigation of Viscosity Using Measured Velocities on Helheim Glacier. [Masters Thesis]. Montana Tech; 2013. Available from: https://scholarworks.umt.edu/etd/4184
University of Georgia
3.
Damodarasamy, Jegan S.
Rheology and microstructure of ready-to-eat retorted egg product.
Degree: MS, Food Science, 2005, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/damodarasamy_jegan_s_200512_ms
► Breakfast eggs are an important item in the military ration program. An improved formula consisting of pasteurized liquid egg, liquid margarine, xanthan gum, pre-gelatinized starch,…
(more)
▼ Breakfast eggs are an important item in the military ration program. An improved formula consisting of pasteurized liquid egg, liquid margarine, xanthan gum, pre-gelatinized starch, calcium caseinate, and water was developed which did not exhibit syneresis and a rubbery texture when the ingredients were adequately blended before thermal processing. To test the effectiveness of different blending procedures, the microstructure of the liquid before retorting and the retorted product was evaluated using a Confocal Laser Scanning Microscope (CLSM) and a cryo-stage scanning electron microscope (C-SEM). Preliminary test showed the dramatic change of texture as result of re-heating the eggs. This phenomenon was studied using a controlled stress Rheometer. The conditions of the Rheometer testing were also simulated on a Sterilmatic retort simulator and the texture of the resulting product was examined using the TAX-T2 texture analyzer. The microstructure evaluation showed that Megatron, a high speed homogenizer yielded the best homogeneity for both fat distribution and hydrocolloids. The textural and rheological studied showed that the hardness and visco-elastic properties of the product increased as result of re-heating
Advisors/Committee Members: Romeo Toledo.
Subjects/Keywords: Rheology
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APA (6th Edition):
Damodarasamy, J. S. (2005). Rheology and microstructure of ready-to-eat retorted egg product. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/damodarasamy_jegan_s_200512_ms
Chicago Manual of Style (16th Edition):
Damodarasamy, Jegan S. “Rheology and microstructure of ready-to-eat retorted egg product.” 2005. Masters Thesis, University of Georgia. Accessed February 17, 2020.
http://purl.galileo.usg.edu/uga_etd/damodarasamy_jegan_s_200512_ms.
MLA Handbook (7th Edition):
Damodarasamy, Jegan S. “Rheology and microstructure of ready-to-eat retorted egg product.” 2005. Web. 17 Feb 2020.
Vancouver:
Damodarasamy JS. Rheology and microstructure of ready-to-eat retorted egg product. [Internet] [Masters thesis]. University of Georgia; 2005. [cited 2020 Feb 17].
Available from: http://purl.galileo.usg.edu/uga_etd/damodarasamy_jegan_s_200512_ms.
Council of Science Editors:
Damodarasamy JS. Rheology and microstructure of ready-to-eat retorted egg product. [Masters Thesis]. University of Georgia; 2005. Available from: http://purl.galileo.usg.edu/uga_etd/damodarasamy_jegan_s_200512_ms
4.
Neelakantan, Ravi.
Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions.
Degree: MS, Department of Chemical and Materials
Engineering, 2016, University of Alberta
URL: https://era.library.ualberta.ca/files/c4b29b603z
► Thickened tailings technology is implemented in some oil sands operations in order to recycle warm process water, thereby reducing net water draw, and to reduce…
(more)
▼ Thickened tailings technology is implemented in some
oil sands operations in order to recycle warm process water,
thereby reducing net water draw, and to reduce the size of tailings
impoundment areas. The rheology of thickened tailings is complex
and time-dependent, and the underlying mechanism of rheological
degradation (J.M. Treinen and R. Cooke, HYDROTRANSPORT 18, BHR
Group, Cranfield, UK, 487-499, 2010) is not well understood. In the
present study, the time evolution of the particle size distribution
(PSD) and vane yield stress of a kaolinite dispersion mixed with
polymer flocculants is examined as a function of shear energy
input. Size distributions are obtained using the Focused Beam
Reflectance Measurement technique. The shear energy input was
quantified with the use of a large-volume, customized concentric
cylinder shearing apparatus which allowed for the testing of about
300cm3 of flocculated tailings per experiment. It was found that
decreases in vane yield stress and aggregate size were correlated
with energy input when acrylamide polymers were used as
flocculants. In particular, very large aggregates appeared to break
down to produce a significant population in the 10-100µm size range
as shear energy input was increased, which was seen in other
studies, e.g. Vaezi et al. (J. Colloid Int. Sci, 355, 96-105,
2011), who observed both size and structure (porosity) changes. A
decrease in apparent volume is the main mechanism for rheological
degradation of acrylamide flocculated thickened tailings. Lowering
the slurry pH before flocculation from 8.5 to 7.0 resulted in a
much greater equilibrium yield stress; however initial rates of
yield stress decay and floc degradation were unaffected. Dual
polymer flocculation with Magnafloc® LT27AG and HyChem HyperFloc
CD650 resulted in increased rates of decay in both rheology and
size distribution. Data obtained for non-conventional polymers
(e.g. PEO) demonstrate the potential for elastic polymer structures
to flocculate in high shear environments and the importance of
other factors (aggregate shape, zeta potential) which require
further investigation.
Subjects/Keywords: Rheology
…Normalized rheology reduction as a function of shear energy input Magnafloc® LT27AG at
pH 7 and pH… …Figure 4.13: Rheology reduction of kaolinite dispersion flocculated with A-C-A at pH 8.5 and… …and rheology reduction using 41% by mass solids paste .41
Table 3.2: Summary of paste… …permanent change. In fact, once the tailings are transported in a pipeline,
the rheology changes… …Predicting the rheology change of such complex mixtures has proven to be difficult and currently…
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APA ·
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APA (6th Edition):
Neelakantan, R. (2016). Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c4b29b603z
Chicago Manual of Style (16th Edition):
Neelakantan, Ravi. “Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions.” 2016. Masters Thesis, University of Alberta. Accessed February 17, 2020.
https://era.library.ualberta.ca/files/c4b29b603z.
MLA Handbook (7th Edition):
Neelakantan, Ravi. “Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions.” 2016. Web. 17 Feb 2020.
Vancouver:
Neelakantan R. Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2020 Feb 17].
Available from: https://era.library.ualberta.ca/files/c4b29b603z.
Council of Science Editors:
Neelakantan R. Effect of Shear Energy Input on the Rheology of
Flocculant-Dosed Kaolinite Suspensions. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c4b29b603z
University of Alberta
5.
Sundararajan, Sujith.
A rheological model for composite truck ground
behavior.
Degree: MS, Department of Civil and Environmental
Engineering, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/wm117p26v
► Mining haul trucks are operated on different ground conditions subjected to adverse shock loading, creating the need to give more attention to the truck components…
(more)
▼ Mining haul trucks are operated on different ground
conditions subjected to adverse shock loading, creating the need to
give more attention to the truck components like suspension, tire,
and the operating ground. Extensive experimental research has been
done on these components at scale. In order to understand the
deformation behavior and the overall relationship between truck
components and the operating ground for a full sized truck,
mathematical equations have been derived for truck operation on
both rigid and oil sand ground surfaces. A rheological model is
also proposed here that has the ability to predict the total and
individual strain of the components. A model consisting of
suspension, tire, and ground is created using MATLAB (Simulink).
Finally, using the data obtained from the three methods, graphs are
plotted and comparisons made with previous laboratory and field
test results to validate the models and their
equations.
Subjects/Keywords: Rheology; Truck
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Manager
APA (6th Edition):
Sundararajan, S. (2014). A rheological model for composite truck ground
behavior. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/wm117p26v
Chicago Manual of Style (16th Edition):
Sundararajan, Sujith. “A rheological model for composite truck ground
behavior.” 2014. Masters Thesis, University of Alberta. Accessed February 17, 2020.
https://era.library.ualberta.ca/files/wm117p26v.
MLA Handbook (7th Edition):
Sundararajan, Sujith. “A rheological model for composite truck ground
behavior.” 2014. Web. 17 Feb 2020.
Vancouver:
Sundararajan S. A rheological model for composite truck ground
behavior. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2020 Feb 17].
Available from: https://era.library.ualberta.ca/files/wm117p26v.
Council of Science Editors:
Sundararajan S. A rheological model for composite truck ground
behavior. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/wm117p26v
Cape Peninsula University of Technology
6.
Foudazi, Reza.
Models for structure-rheology of highly concentrated emulsions
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2152
► Highly concentrated emulsions (HCE) are classified as high internal phase ratio emulsions (or simply HIPRE), and the dispersed phase droplets are ranged In a hexagonal…
(more)
▼ Highly concentrated emulsions (HCE) are classified as high internal phase ratio
emulsions (or simply HIPRE), and the dispersed phase droplets are ranged In a
hexagonal closely packed configuration. This closely packed configuration and the
profound hydrodynamic interaction between neighbouring droplets induce mechanical
interference between the droplets, thus prohibiting their free movement. Hence, while
the highly concentrated emulsions consist of very low viscosity and inelastic
components, they show gel-like behaviour with high elasticity and non-Newtonian flow
response. It has been suggested in the literature that this behaviour originated from
interfacial energy in terms of Laplace pressure. Therefore, the scaling of rheological
properties with Laplace pressure is expected, but several publications show a deviation
from this scaling behaviour. It seems that the source of deviation from this scaling is
interdroplet interaction, which can contribute to the rheological behaviour of highly
concentrated emulsions. The shear modulus of highly concentrated emulsions in the
presence of interdroplet interaction was developed in this work. The prediction of model
was verified by the data presented in the literature. It was shown that a small source of
interdroplet interaction can result in deviation from scaling of shear modulus with
Laplace pressure.
Subjects/Keywords: Emulsions;
Rheology
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Manager
APA (6th Edition):
Foudazi, R. (2009). Models for structure-rheology of highly concentrated emulsions
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2152
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Foudazi, Reza. “Models for structure-rheology of highly concentrated emulsions
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 17, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2152.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Foudazi, Reza. “Models for structure-rheology of highly concentrated emulsions
.” 2009. Web. 17 Feb 2020.
Vancouver:
Foudazi R. Models for structure-rheology of highly concentrated emulsions
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 17].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2152.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Foudazi R. Models for structure-rheology of highly concentrated emulsions
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/2152
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Costanzo, Salvatore.
Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear.
Degree: 2017, University of Crete (UOC); Πανεπιστήμιο Κρήτης
URL: http://hdl.handle.net/10442/hedi/40133
► The aim of the present thesis is to shed light into the nonlinear rheological behavior ofcomplex polymeric structures by means of state-of-the-art instrumentation, particularlyfocusing on…
(more)
▼ The aim of the present thesis is to shed light into the nonlinear rheological behavior ofcomplex polymeric structures by means of state-of-the-art instrumentation, particularlyfocusing on shear rheology. Strong nonlinear flows are ubiquitous in polymer process-ing, therefore their understanding is fundamental for technological applications. On theother hand, the progress in nonlinear rheology has been halted by experimental issuesassociated with flow instabilities, rendering rheometric experiments problematic. Thedevelopment of experimental tools to resolve these issues is a timely, outstanding challenge. Overcoming flow instabilities in nonlinear experimental rheology will advancethe field in different directions such as accurate modeling development, decoding molec-ular mechanisms of motion, designing macromolecular systems with desired, tunableproperties. Particularly, in relation to molecular mechanisms, knowledge of polymerdynamics in nonlinear flows is rather limited, especially in shear. In such a context,this thesis work attempts to answer two key questions: i) How can we obtain reliablemeasurements in transient shear? ii) What is the interplay of entanglements, branch-ing and associations in determining the nonlinear rheology of complex systems? It isclear that answering the first question is necessary in order to address the second one.Therefore, in the first part of this thesis we present the design and implementation of acone-partitioned-plate (CPP) geometry for ARES rheometer that allows for accurate,artifact-free measurements in nonlinear transient shear. In the second part, we applyCPP and uniaxial extensional rheometry to investigate model systems including linear,ring, Cayley-tree and dendronized polymers, in order to address the above-mentionedquestions.
Ο στόχος της παρούσας διατριβής είναι να ρίξει φως στη μή-γραμμική ρεολογική συμπεριφορά σύνθετων πολυμερικών δομών με τη χρήση προχωρημένων τεχνικών τελευταίας τεχνολογίας και με ιδιαίτερη εστίαση στην ρεολογία διάτμησης. Ισχυρά μή-γραμμικά φαινόμενα ροής είναι πανταχού παρόντα στις διαδικασίες κατεργασίας πολυμερών,επομένως η κατανόησή τους είναι θεμελιώδους σημασίας για τεχνολογικές εφαρμογές. Από την άλλη πλευρά, η πρόοδος στην μή-γραμμική ρεολογία εξαρτάται από την επίλυση σοβαρών πειραματικών προβλημάτων που σχετίζονται με αστάθειες ροής. Η ανάπτυξη πειραματικών εργαλείων για την επίλυση αυτών των ζητημάτων είναι μια εξαιρετικά χρονοβόρα και επίπονη πρόκληση. Ξεπερνώντας αστάθειες ροής στην μή-γραμμική πειραματική ρεολογία θα οδηγήσει τον τομέα σε νέες κατευθύνσεις όπως η ακριβής και ποσοτική μοντελοποίηση, η αποκωδικοποίηση των μηχανισμών κίνησης μακρομορίων, και ο σχεδιασμός μακρομοριακών συστημάτων με επιθυμητές ιδιότητες που θα δύνανται να καθοριστούν. Ιδιαίτερα, σε σχέση με τους μοριακούς μηχανισμούς, η γνώση της μή-γραμμικής ροής είναι μάλλον περιορισμένη,ειδικά στη διάτμηση. Σε αυτό το πλαίσιο, το έργο αυτής της διατριβής επιχειρεί να απαντήσει σε δύο καίρια ερωτήματα: i) πώς θα αποκτήσουμε αξιόπιστες μετρήσεις σε παροδική (χρονικά…
Subjects/Keywords: Ρεολογία; Rheology
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APA ·
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APA (6th Edition):
Costanzo, S. (2017). Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/40133
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Costanzo, Salvatore. “Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear.” 2017. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed February 17, 2020.
http://hdl.handle.net/10442/hedi/40133.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Costanzo, Salvatore. “Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear.” 2017. Web. 17 Feb 2020.
Vancouver:
Costanzo S. Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2017. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/10442/hedi/40133.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Costanzo S. Development of protocols for investigating linear, branched and supramolecular polymers undergoing shear. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2017. Available from: http://hdl.handle.net/10442/hedi/40133
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Florida
8.
Shaikh, Saif Asif.
Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers.
Degree: PhD, Chemical Engineering, 2017, University of Florida
URL: http://ufdc.ufl.edu/UFE0051779
► A combined work of experiments and numerical simulations is proposed to investigate the dynamics and rheology of highly concentrated suspensions of non-colloidal rigid rods in…
(more)
▼ A combined work of experiments and numerical simulations is proposed to investigate the dynamics and
rheology of highly concentrated suspensions of non-colloidal rigid rods in a Newtonian fluid. Detailed measurements of the
rheology and the microstructure are made using a variety of experimental devices with different geometries and imposed flows. Standard
rheology experiments (volume-controlled
rheology), as well as a novel method of rheometry, are carried out to measure torques, particle pressures, and volume fractions at high concentration (pressure-controlled
rheology). Another experiment has been designed and constructed to study the microstructure (spatial and orientation distribution) of a suspension of rigid rods in an oscillatory parabolic flow. Though the flow is reversible in these systems, the changes in the microstructure are irreversibile in the case of concentrated suspensions due to particle interactions. The microstructure is affected by, and has an effect, on the imposed flows; this non-linear dependency includes hydrodynamic interactions. The purpose of these experiments is to gain insight into phenomena such as apparent shear-thinning at high shear rates and demixing due to shear-induced migration. ( en )
Advisors/Committee Members: BUTLER,JASON E (committee chair), CHAUHAN,ANUJ (committee member), MEI,RENWEI (committee member).
Subjects/Keywords: rheology – suspensions
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APA (6th Edition):
Shaikh, S. A. (2017). Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0051779
Chicago Manual of Style (16th Edition):
Shaikh, Saif Asif. “Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers.” 2017. Doctoral Dissertation, University of Florida. Accessed February 17, 2020.
http://ufdc.ufl.edu/UFE0051779.
MLA Handbook (7th Edition):
Shaikh, Saif Asif. “Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers.” 2017. Web. 17 Feb 2020.
Vancouver:
Shaikh SA. Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers. [Internet] [Doctoral dissertation]. University of Florida; 2017. [cited 2020 Feb 17].
Available from: http://ufdc.ufl.edu/UFE0051779.
Council of Science Editors:
Shaikh SA. Dynamics and Rheology of Concentrated Suspensions of Rigid Fibers. [Doctoral Dissertation]. University of Florida; 2017. Available from: http://ufdc.ufl.edu/UFE0051779
Rutgers University
9.
Sridhar, Adithya, 1994-.
Focused laser spike dewetting as a method to probe rheology of polymer thin films.
Degree: MS, Mechanical and Aerospace Engineering, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/59236/
► Thin polymer films whose thickness ranges from fractions of a nanometer to several micrometers have been in high demand over the past few years in…
(more)
▼ Thin polymer films whose thickness ranges from fractions of a nanometer to several micrometers have been in high demand over the past few years in several industries. Their high surface area to volume ratio and the potential for low-cost processing with minimal material usage while fulfilling purpose requirements make them very useful. However, these films behave differently from bulk materials and majority of polymer fabrication processes involve polymer flow. Hence the study of polymer thin film
rheology becomes crucial. Bulk measurement of
rheology is well established, but it has disadvantages in that it requires a lot of material and may not capture thin film physics. Previous studies have demonstrated dewetting of thin polymer films to study film material stability and properties. This study seeks to use focused laser spike (FLaSk) dewetting as a method to probe
rheology of thin material films. The method is used to extract materials properties of three thin films – Polystyrene (PS), Poly –4–hydroxystyrene (PHS) and N, N′-Bis (3 – methylphenyl)–N, N′-diphenylbenzidine (TPD) having different glass transition temperatures
Advisors/Committee Members: Singer, Jonathan P (chair), Mazzeo, Aaron (co-chair), Malhotra, Rajiv (co-chair), School of Graduate Studies.
Subjects/Keywords: Rheology; Polymers
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APA (6th Edition):
Sridhar, Adithya, 1. (2018). Focused laser spike dewetting as a method to probe rheology of polymer thin films. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/59236/
Chicago Manual of Style (16th Edition):
Sridhar, Adithya, 1994-. “Focused laser spike dewetting as a method to probe rheology of polymer thin films.” 2018. Masters Thesis, Rutgers University. Accessed February 17, 2020.
https://rucore.libraries.rutgers.edu/rutgers-lib/59236/.
MLA Handbook (7th Edition):
Sridhar, Adithya, 1994-. “Focused laser spike dewetting as a method to probe rheology of polymer thin films.” 2018. Web. 17 Feb 2020.
Vancouver:
Sridhar, Adithya 1. Focused laser spike dewetting as a method to probe rheology of polymer thin films. [Internet] [Masters thesis]. Rutgers University; 2018. [cited 2020 Feb 17].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59236/.
Council of Science Editors:
Sridhar, Adithya 1. Focused laser spike dewetting as a method to probe rheology of polymer thin films. [Masters Thesis]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59236/
University of Alberta
10.
Salehi, Mohammadreza.
Characterization of mature fine tailings in the context of
its response to chemical treatment.
Degree: MS, Department of Chemical and Materials
Engineering, 2010, University of Alberta
URL: https://era.library.ualberta.ca/files/zg64tn162
► Continuous accumulation of Mature Fine Tailings (MFT) is a major challenge to oil sands industry. To reduce the inventory of MFT through development of novel…
(more)
▼ Continuous accumulation of Mature Fine Tailings (MFT)
is a major challenge to oil sands industry. To reduce the inventory
of MFT through development of novel tailings treatment
technologies, it is essential to understand the stabilization
mechanism of fine solids in MFT. This project aims at
characterizing fine solids of MFT. A novel method is developed in
this study to understand characteristics of fine solids in MFT by
studying their response to the changes in water chemistry and
chemical treatment. Settling and rheological response of MFT to
chemical additives is determined. Combined with solids
characterization of the different layers of settled MFT, an
enhanced understanding of stabilization of fine solids in MFT is
gained. The knowledge generated through this study will provide a
scientific basis for technology development of MFT
treatment.
Subjects/Keywords: Characterization; MFT; Rheology
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APA (6th Edition):
Salehi, M. (2010). Characterization of mature fine tailings in the context of
its response to chemical treatment. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/zg64tn162
Chicago Manual of Style (16th Edition):
Salehi, Mohammadreza. “Characterization of mature fine tailings in the context of
its response to chemical treatment.” 2010. Masters Thesis, University of Alberta. Accessed February 17, 2020.
https://era.library.ualberta.ca/files/zg64tn162.
MLA Handbook (7th Edition):
Salehi, Mohammadreza. “Characterization of mature fine tailings in the context of
its response to chemical treatment.” 2010. Web. 17 Feb 2020.
Vancouver:
Salehi M. Characterization of mature fine tailings in the context of
its response to chemical treatment. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2020 Feb 17].
Available from: https://era.library.ualberta.ca/files/zg64tn162.
Council of Science Editors:
Salehi M. Characterization of mature fine tailings in the context of
its response to chemical treatment. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/zg64tn162
Victoria University of Wellington
11.
Monahan, Nicholas.
Structure and Rheology of Monodisperse and Bimodal Emulsions.
Degree: 2010, Victoria University of Wellington
URL: http://hdl.handle.net/10063/1401
► Emulsions are the basis for many commercial products such as foodstuffs and paint due in part to their highly tunable flow properties. It is qualitatively…
(more)
▼ Emulsions are the basis for many commercial products such as foodstuffs and paint
due in part to their highly tunable flow properties. It is qualitatively understood that
factors such as the dispersed phase droplet size and size distribution should affect
how an emulsion flows because they influence how droplets can deform or pack.
Since standard emulsification techniques such as blending and homogenization cannot
produce emulsions with well-defined size distributions, little work has been done to,
in particular, quantitatively determine the influence of droplet size distribution on
emulsion flow properties. Consequently, in this investigation we have probed how the
droplet size distribution affects emulsion flow properties by using model monodisperse
emulsion systems with narrow, controllable droplet size distributions.
Using a microfluidic flow focusing device, dodecane-in-water emulsions with diameters
between 50 to 100 m with polydispersities less than 5% were produced, as characterized
by pulsed field gradient nuclear magnetic resonance and optical microscopy. Due
to the relatively large size of the droplets, it was only possible to examine the creamed
phase of the emulsion. Samples of known polydispersity were made by mixing known
quantities of two monodisperse emulsions. The monodisperse and bimodal emulsions
were then subjected to rotational and oscillatory shear flow using a controlled stress
rheometer to determine the effects of droplet size and size distribution on emulsion
flow properties.
Rotational and oscillatory rheological experiments showed that the monodisperse
emulsions had two distinct behaviours: foam-like with appreciable thixotropy and
yield stresses as well as emulsion-like with no evident thixotropy. The transition
between these two behaviours appears to happen at a critical droplet radius between
33 and 37 micrometres. The rheological properties of the bimodal emulsions was split into
three distinct behaviours. In samples that could be considered a matrix of large
droplets perturbed by smaller droplets, the flow properties were similar to those of
the constituent emulsion with the larger droplets. Increasing the number fraction of
smaller droplets to a 1:1 ratio creates an entirely new phase with significantly reduced
elastic properties. Surprisingly, when the emulsion primarily consists of small droplets,
the flow properties are most similar to that of the large droplets. Additionally, despite
the microstructural differences, all emulsions showed flow characteristics typical of
soft glassy materials above the glass transition temperature.
These results demonstrate the significant influence of microstructure on emulsion
rheology, where altering the droplet size or polydispersity essentially creates a new
phase with its own unique flow properties that is not simply a combination of the
properties of the individual monodisperse components that make up the sample
Advisors/Committee Members: McGrath, Kathryn.
Subjects/Keywords: Emulsions; Rheology; Microfluidics
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APA (6th Edition):
Monahan, N. (2010). Structure and Rheology of Monodisperse and Bimodal Emulsions. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/1401
Chicago Manual of Style (16th Edition):
Monahan, Nicholas. “Structure and Rheology of Monodisperse and Bimodal Emulsions.” 2010. Masters Thesis, Victoria University of Wellington. Accessed February 17, 2020.
http://hdl.handle.net/10063/1401.
MLA Handbook (7th Edition):
Monahan, Nicholas. “Structure and Rheology of Monodisperse and Bimodal Emulsions.” 2010. Web. 17 Feb 2020.
Vancouver:
Monahan N. Structure and Rheology of Monodisperse and Bimodal Emulsions. [Internet] [Masters thesis]. Victoria University of Wellington; 2010. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/10063/1401.
Council of Science Editors:
Monahan N. Structure and Rheology of Monodisperse and Bimodal Emulsions. [Masters Thesis]. Victoria University of Wellington; 2010. Available from: http://hdl.handle.net/10063/1401
Kansas State University
12.
Vosahlik, Jan.
Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment.
Degree: PhD, Department of Civil
Engineering, 2018, Kansas State University
URL: http://hdl.handle.net/2097/39134
► Pumping is the most utilized placement technique to deliver fresh concrete from the concrete mixer to the formwork on construction site. Compared to other available…
(more)
▼ Pumping is the most utilized placement technique to
deliver fresh concrete from the concrete mixer to the formwork on
construction site. Compared to other available placement methods,
such as bucket-and-crane or conveyor belts, pumping offers superior
placement rates while reducing the required labor cost. Despite the
fact that concrete pumping has been utilized on job sites around
the world since the early 1960s, there is still a lack of
knowledge, supported by research evidence, as to what affects
concrete pumpability and how pumping changes concrete properties
both in the plastic and hardened state.
A four-phase research
study was carried out to: (1) improve the existing methodology of
rheological characterization of the lubrication layer formed during
pumping, (2) evaluate the effect of concrete mixture constituents
and proportioning on rheological properties of concrete and the
lubrication layer, (3) asses the effect of pumping and pumping
pressure on concrete fresh properties and the air void system under
controlled conditions, and (4) to evaluate the effect of pumping on
concrete fresh properties and the air void system in the field
conditions.
In the first phase of this research program, a
correction procedure was developed evaluating 3D flow at the bottom
of the cylindrical concrete interface rheometer. Results showed
that the correction procedure can be successfully used for
characterization of lubrication layer properties, and that the
bottom of the cylinder can cause measurement error of up to 10%
depending on concrete rheological properties and the interface
rheometer geometry.
The second phase of this research program
consisted of a laboratory study to evaluate rheological properties
and properties of the lubrication layer of large variety of
concrete mixtures. Considered mixture proportion variables included
air void content, water-to-cement ratio, paste volume, fly ash
replacement ratio, fine-to-coarse aggregate ratio, aggregate shape,
use of viscosity-modifying admixture, and use of nano-clay
particles. Results indicated that the changes in rheological
properties of the lubrication due to mixture proportioning
adjustments corresponded in most cases to changes of the bulk
concrete rheological properties.
In the third phase of the study,
a full-scale controlled pumping experiment was conducted. During
the experiment, three different concrete mixtures were pumped and
both fresh and hardened properties of concrete were determined.
Additionally, the pumping circuit was equipped with a system to
monitor pumping pressures. The obtained results revealed that
concrete pumping can significantly modify concrete fresh
properties. Additionally, it was shown that changes in the fresh
properties as well as in the concrete air void system are
independent of applied concrete pressure.
Finally, the forth phase
of this research program consisted of field evaluation of concrete
pumping. Six concrete bridge project sites were visited and
concrete samples were collected before and after pumping. Analysis
results…
Advisors/Committee Members: Christopher A. Jones
Kyle A. Riding.
Subjects/Keywords: concrete;
pumping;
rheology
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Vosahlik, J. (2018). Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/39134
Chicago Manual of Style (16th Edition):
Vosahlik, Jan. “Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment.” 2018. Doctoral Dissertation, Kansas State University. Accessed February 17, 2020.
http://hdl.handle.net/2097/39134.
MLA Handbook (7th Edition):
Vosahlik, Jan. “Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment.” 2018. Web. 17 Feb 2020.
Vancouver:
Vosahlik J. Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment. [Internet] [Doctoral dissertation]. Kansas State University; 2018. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/2097/39134.
Council of Science Editors:
Vosahlik J. Pumping of
concrete mixtures: rheology, lubrication layer properties and
pumping pressure assessment. [Doctoral Dissertation]. Kansas State University; 2018. Available from: http://hdl.handle.net/2097/39134
University of Edinburgh
13.
Wilson, Laurence.
Optical force measurements in concentrated colloidal suspensions.
Degree: 2007, University of Edinburgh
URL: http://hdl.handle.net/1842/3220
► This work concerns the construction and testing of an optical tweezers-based force transducer, and its application to a hard-sphere colloidal system. A particle in an…
(more)
▼ This work concerns the construction and testing of an optical tweezers-based force transducer, and its application to a hard-sphere colloidal system. A particle in an optical trap forward-scatters a fraction of the trapping light, which is collected in order to give high-resolution information on the trapped particle’s position relative to the trap centre. The system is then calibrated to convert particle displacements to forces. The colloid used in this study is a density- and refractive index-matched suspension of PMMA particles, radius 860 ± 70nm, with volume fractions in the range φ = 40 → 62%. Passive microrheological measurements have yielded information about rearrangements in a tracer’s cage of nearest neighbours, as well as highly localised measurements of the high-frequency viscosity, where the presence of the colloidal host causes around a tenfold increase compared to the bare solvent case. Measurements have also demonstrated the effect of sample history on local short-time self-diffusion coefficient, with perturbations caused by translating a particle within the sample taking up to an hour to relax in a φ = 58% sample. The high resolution particle tracking offered by this technique has also allowed for the first measurement of structure at a shorter lengthscale than the ‘dynamic cage size’ observed using other experimental techniques. In addition, active measurements have shown the emergence of a yield stress on the order of 5Pa as the volume fraction approaches the glass transition at φ ≈ 58%.
Subjects/Keywords: 541.33; Physics; Rheology
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APA (6th Edition):
Wilson, L. (2007). Optical force measurements in concentrated colloidal suspensions. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/3220
Chicago Manual of Style (16th Edition):
Wilson, Laurence. “Optical force measurements in concentrated colloidal suspensions.” 2007. Doctoral Dissertation, University of Edinburgh. Accessed February 17, 2020.
http://hdl.handle.net/1842/3220.
MLA Handbook (7th Edition):
Wilson, Laurence. “Optical force measurements in concentrated colloidal suspensions.” 2007. Web. 17 Feb 2020.
Vancouver:
Wilson L. Optical force measurements in concentrated colloidal suspensions. [Internet] [Doctoral dissertation]. University of Edinburgh; 2007. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/1842/3220.
Council of Science Editors:
Wilson L. Optical force measurements in concentrated colloidal suspensions. [Doctoral Dissertation]. University of Edinburgh; 2007. Available from: http://hdl.handle.net/1842/3220
University of Akron
14.
Liu, Gengxin.
Nonlinear Rheology of Long-Chain Branched Polymers.
Degree: PhD, Polymer Science, 2015, University of Akron
URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1436977058
► Entangled polymers show significant nonlinear rheological behaviors. Those studies on the mechanical behaviors of polymer melts and solutions not only promote our understanding on polymer…
(more)
▼ Entangled polymers show significant nonlinear
rheological behaviors. Those studies on the mechanical behaviors of
polymer melts and solutions not only promote our understanding on
polymer dynamics, but also guide the application of polymers and
establish principals to design polymeric materials. Recently
emerged interpretations on nonlinear
rheology of linear polymers
proposed by Dr. Shi-Qing Wang emphasize the network nature of
entangled polymers. This dissertation studies the nonlinear
rheology of long-chain branched (LCB) polymers. A new synthetic
method is developed and implemented to overcome the limitation of
previous methods for not being able to synthesize long enough
branches. This method can produce ultra-high molecular weight LCB
polymers with branches of identical length and uniform spacing
between branch points.Polymers with multiple long branches show
remarkable resistant to the elastic-driven decohesion comparing to
linear polymers. In startup uniaxial extension, they are
extraordinarily more stretchable. An empirical rule shows that the
failure of entangled network, as characterized by the overshoot of
engineering stress, is proportional to the square root of number of
entanglements. Polymers with LCB are also more resistant to failure
in stepwise extension (withstand a larger stretching ratio), which
would be part of film blowing process. Historically, strain
hardening stands for the upward deviation of transient extensional
viscosity comparing to zero-rate transient viscosity, which
typically shows up on branched polymers. Under the newly emerged
conceptual framework, such behavior is due to three factors:
firstly, the shrinking cross-section area leads to a factor of
extension ratio in calculating true stress and transient
extensional viscosity; secondly, the introduction of branches
suppresses the breakdown of entangled network; lastly, the
entanglement network is strengthened at sufficient high Hencky
rates during extension. Entangled polymeric liquids have so far
only shown strain softening upon startup shear, signified by stress
overshoot. However, solutions of polystyrenes with LCB exhibit
strain hardening upon startup shear at high shear rates, undergoing
non-Gaussian chain stretching and reaching finite extensibility
limit. The stronger than linear increase of the shear stress ends
with a sharp decline, forming a cusp. At intermediate shear rates,
stress overshoots always occur at the same strain, which is
explained also by the length of backbone. The LCB polymers show a
rich variety of transient responses to startup shear at different
rates and open a large window of dynamics to meet practical
applications.
Advisors/Committee Members: Wang, Shi-Qing (Advisor).
Subjects/Keywords: Polymers; rheology; polymer
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APA (6th Edition):
Liu, G. (2015). Nonlinear Rheology of Long-Chain Branched Polymers. (Doctoral Dissertation). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1436977058
Chicago Manual of Style (16th Edition):
Liu, Gengxin. “Nonlinear Rheology of Long-Chain Branched Polymers.” 2015. Doctoral Dissertation, University of Akron. Accessed February 17, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1436977058.
MLA Handbook (7th Edition):
Liu, Gengxin. “Nonlinear Rheology of Long-Chain Branched Polymers.” 2015. Web. 17 Feb 2020.
Vancouver:
Liu G. Nonlinear Rheology of Long-Chain Branched Polymers. [Internet] [Doctoral dissertation]. University of Akron; 2015. [cited 2020 Feb 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1436977058.
Council of Science Editors:
Liu G. Nonlinear Rheology of Long-Chain Branched Polymers. [Doctoral Dissertation]. University of Akron; 2015. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1436977058
Cape Peninsula University of Technology
15.
Mudeme, Sipho.
Drop formation and rupture in shearing during processing of highly concentrated emulsions
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2164
► The purpose of emulsification process is to create numerous small droplets from a large and homogenous oil phase. The emulsion used for this study is…
(more)
▼ The purpose of emulsification process is to create numerous small droplets from a large and
homogenous oil phase. The emulsion used for this study is new thermodynamically unstable
multi-component water-in-oil (w/o) explosive type with an internal phase ratio of approximately
94% (wt), i.e. far beyond the close packing limit of spherical droplets of 74%. However, little work
has been done for this system, pertaining to the literature explaining what physical phenomena
plays a major role in the process of drop formation during highly concentrated emulsion (HGE)
manufacturing. This thesis is devoted to develop an understanding of what parameters control
drop formation and rupture during processing of highly concentrated emulsions. The material used for the study consisted of three Pibsa derivatives (MEA, IMIDE and UREA),
one mixture (MEA/SMO, 10:1) and SMO. Two concentrations were used namely 8% and 14%
and the two fuel phase material were Mosspar-H and Shell sol. The Pibsa IMIDE was carried out
in both oil phases. To carry out the study, the Hobart N50 mixer coupled with a power and
harmonic analyser to record power as a function of time was used to manufacture all samples
for the study.
Subjects/Keywords: Emulsions;
Drops;
Rheology
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Manager
APA (6th Edition):
Mudeme, S. (2009). Drop formation and rupture in shearing during processing of highly concentrated emulsions
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mudeme, Sipho. “Drop formation and rupture in shearing during processing of highly concentrated emulsions
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 17, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mudeme, Sipho. “Drop formation and rupture in shearing during processing of highly concentrated emulsions
.” 2009. Web. 17 Feb 2020.
Vancouver:
Mudeme S. Drop formation and rupture in shearing during processing of highly concentrated emulsions
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 17].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mudeme S. Drop formation and rupture in shearing during processing of highly concentrated emulsions
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/2164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
16.
Zhang, Yi.
Suspension Dewatering with Aggregate
Densification.
Degree: 2014, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270
► This thesis concerns design of two pieces of suspension dewatering equipment (i.e. transient batch settlers and steady state continuous gravity thickeners). In a transient batch…
(more)
▼ This thesis concerns design of two pieces of
suspension dewatering equipment (i.e. transient batch settlers and
steady state continuous gravity thickeners). In a transient batch
settler, very slow densification of aggregates within the
suspension is considered whilst the drag on the solids in the
suspension is assumed to be negligible. The interface of the
suspension is then determined by a balance between gravity and the
gradient of the compressive yield stress of the gelled suspension.
The compressive yield stress functional form in general could be
either a weakly gelled formula, or a strongly gelled formula. These
formulae differ in the way they behave for solids concentrations in
the neighbourhood of the suspension gel point. The effects of the
above two gel formulae, the evolution of the compressive yield
stress functional form over time during aggregate densification,
different initial suspension heights, and different initial feed
solids volume fractions upon the predictions of consolidated bed
structures and solids volume fractions obtained at the bottom of a
batch settler, and upon the evolution of the heights of the
suspension and the consolidated bed have been explored. A
sufficiently tall initial suspension height might lead to
insignificant increases in the solids volume fractions obtained at
the bottom of batch settlers after time-dependent aggregate
densification. The interfaces of the suspension and the
consolidation zone coincide after aggregate densification if the
gel point, which increases with time, is larger than the initial
feed solids volume fractions. Moreover, the maximum permitted
underflow solids fluxes predicted from steady state thickeners have
been investigated and compared. Pre-shearing of aggregates which
densifies aggregates to have smaller diameters upon entering the
thickener is necessary if large underflow solids fluxes and small
underflow solids volume fractions are specified. The solids volume
fraction at the top of the consolidated bed which is the densified
gel point is influenced by the extent of pre-shearing of
aggregates. An algorithm for determining this densified gel point
has also been developed. In reality, thickeners contain not just a
consolidating bed, but also a hindered settling region above it.
When the hindered settling region is considered in a thickener, the
effects of the extent of aggregate densification that has occurred
in the hindered settling region and how that impacts upon thickener
performance and sludge rheological properties have been explored in
this thesis. A new algorithm for predicting the densified gel point
obtained at the top of the consolidated bed has been developed when
the hindered settling region is present. The effects of underflow
solids volume fractions, aggregate densification rate parameters
and pre-shearing of aggregates upon the predictions of maximum
permitted underflow solids fluxes, sludge rheological properties,
and thickener performance have been explored. The predictions of
thickener performance using both the weakly and…
Advisors/Committee Members: MARTIN, ALASTAIR AD, Grassia, Paul, Martin, Alastair.
Subjects/Keywords: Suspension;
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, Y. (2014). Suspension Dewatering with Aggregate
Densification. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270
Chicago Manual of Style (16th Edition):
Zhang, Yi. “Suspension Dewatering with Aggregate
Densification.” 2014. Doctoral Dissertation, University of Manchester. Accessed February 17, 2020.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270.
MLA Handbook (7th Edition):
Zhang, Yi. “Suspension Dewatering with Aggregate
Densification.” 2014. Web. 17 Feb 2020.
Vancouver:
Zhang Y. Suspension Dewatering with Aggregate
Densification. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2020 Feb 17].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270.
Council of Science Editors:
Zhang Y. Suspension Dewatering with Aggregate
Densification. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270
Cornell University
17.
Athiphunamphai, Nongnuch.
Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
.
Degree: 2013, Cornell University
URL: http://hdl.handle.net/1813/34325
► Applesauce is made from a blend of varieties and processed year round due to the availability of apples from cold storage and controlled atmosphere storage,…
(more)
▼ Applesauce is made from a blend of varieties and processed year round due to the availability of apples from cold storage and controlled atmosphere storage, factors that affect applesauce quality. Applesauce attributes are also affected by processing operations; thus, understanding how these factors influence the final product will help to improve applesauce quality. Our goals were to assess the effect of processing parameters on rheological, physical and chemical properties of applesauce, considering variety and ripening effects, and to optimize processing conditions to improve sauce quality. We investigated the following factors: hot and cold break process; extractor rotational speed; addition of diced apples to extractor sauce output; addition of exogenous pectin methyl esterase (PME) and calcium; and activation of endogenous PME. Samples were analyzed for rheological properties (consistency index, yield stress, USDA consistency values) and physico-chemical properties (particle size distribution, pH, soluble solids, pectin content, pectin degree of methoxylation (DM)). Results were evaluated by ANOVA and Tukey's HSD test (p ! 0.05). Best sauce quality (thicker sauce with low syneresis) was achieved when applesauce had a mean particle size ! 700 [MICRO SIGN]m, particle size distribution span " 1.75, total soluble pectin " 0.25%, and pectin DM ! 60%. Ripening or processing conditions could modify these parameters to meet targeted applesauce
rheology. Processing effects differed with variety and ripening stage. Overall, higher rotational extractor speed and addition of "50% diced apples to extractor sauce output prior to final pulping, resulted in increased sauce viscosity and decreased syneresis, due to an increase in total soluble pectin, a lower mean particle diameter and a wider particle size distribution. Exogenous PME addition caused a decrease in pectin DM, leading to higher sauce viscosity and less syneresis. When PME and Ca2+ were added, viscosity was highest but resulted in higher syneresis. Activation of endogenous PME at 5560°C for 10 min lowered the pectin DM from 83% to 60-70% but no change on applesauce
rheology was observed. By understanding how sauce physico-chemical and rheological properties are affected by variety, ripening and processing parameters, it is possible to optimize all relevant conditions to achieve better consistency and quality.
Advisors/Committee Members: Schmit, Todd Michael (committeeMember), Moraru, Carmen I (committeeMember).
Subjects/Keywords: applesauce;
rheology;
processing
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APA ·
Chicago ·
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CSE |
Export
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APA (6th Edition):
Athiphunamphai, N. (2013). Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
. (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/34325
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Athiphunamphai, Nongnuch. “Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
.” 2013. Thesis, Cornell University. Accessed February 17, 2020.
http://hdl.handle.net/1813/34325.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Athiphunamphai, Nongnuch. “Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
.” 2013. Web. 17 Feb 2020.
Vancouver:
Athiphunamphai N. Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
. [Internet] [Thesis]. Cornell University; 2013. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/1813/34325.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Athiphunamphai N. Effect Of Processing Parameters On The Rheological And Physico-Chemical Properties Of Varietal Applesauce
. [Thesis]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/34325
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Western Carolina University
18.
Ballew, Stephen Daniel.
Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management.
Degree: 2011, Western Carolina University
URL: http://libres.uncg.edu/ir/listing.aspx?styp=ti&id=9011
► Most pesticides produce some risk of harm to the environment because pesticides are designed to kill or adversely affect living organisms (US EPA, 2010). It…
(more)
▼ Most pesticides produce some risk of harm to the
environment because pesticides are designed to kill or adversely
affect living organisms (US EPA, 2010). It is desirable that
alternate, safer forms of pest control be developed. One
alternative is the controlled release of pest insect sex pheromones
to produce a mating disruption effect (Ahmed et al., 1993;
Atterholt, 1996). Aqueous paraffin wax emulsions have shown much
promise as formulations for this controlled release when applied to
tree bark or foliage (Atterholt et al., 1996; Rice et al., 1997;
Atterholt et al., 1998; Atterholt et al., 1999; Meissner et al.,
2000; de Lame, 2003). Soy wax has recently become of interest in
pheromone formulations because it is renewable, biodegradable,
commercially available, and acceptable for organic farming (Behle,
2008). Emulsions exhibit complex flow behavior which can be studied
using rheometry (Macosko, 1994; Mezger, 2006). Rheometry refers to
experimental techniques to determine the fundamental relationships
between force and deformation in materials (Macosko, 1994). The
rheological properties of emulsions are very important for
production, storage, and application of these formulations (Mezger,
2006). In this project the flow and viscoelastic properties of
aqueous 30% paraffin wax and soy wax emulsions were investigated
using three different emulsifiers: sorbitan monostearate (Span
60®), triethanolamine (TEA) stearate, and a 50%-50% mixture of
both. Span 60® has already been used to make effective emulsions
for the controlled release of pheromones, and it is food safe
(Atterholt et al., 1996; Rice et al., 1997; Atterholt et al., 1998;
Atterholt et al., 1999; Meissner et al., 2000; de Lame, 2003). TEA
stearate is widely used to make nontoxic wax emulsions in the
cosmetics industry (Wilkinson, 1940). The investigations were
carried out in both the rotational and oscillatory modes of a
parallel-plate rheometer. The flow curves at three different
temperatures (15 °C, 25 °C and 35 °C) of each emulsion were fitted
with the Herschel-Bulkley model with the yield points determined
using the one tangent method. The resulting equations can predict
flow behavior at different conditions (Mezger, 2006). The emulsions
were also tested using a temperature sweep at low shear from 15 °C
to 50 °C to investigate temperature dependent changes. The
viscoelastic properties were investigated using oscillatory shear
tests and expressed in terms of elastic modulus and loss modulus.
This gives information about time-dependant behavior like storage
and the elastic character of the formulations which were found to
be weak gels (Mezger, 2006). The Span 60® emulsions displayed faux
shear-thickening behavior due to droplet subdivision while the
other emulsions generally displayed shear-thinning behavior. Each
emulsion approaches an infinite shear viscosity. The yield points
and other flow parameters for the emulsions varied with
temperature, depending on the formulation in question. All soy wax
emulsions showed an increase in viscosity between 45 °C…
Advisors/Committee Members: Cynthia Atterholt (advisor).
Subjects/Keywords: Pheromones; Emulsions; Rheology
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ballew, S. D. (2011). Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management. (Masters Thesis). Western Carolina University. Retrieved from http://libres.uncg.edu/ir/listing.aspx?styp=ti&id=9011
Chicago Manual of Style (16th Edition):
Ballew, Stephen Daniel. “Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management.” 2011. Masters Thesis, Western Carolina University. Accessed February 17, 2020.
http://libres.uncg.edu/ir/listing.aspx?styp=ti&id=9011.
MLA Handbook (7th Edition):
Ballew, Stephen Daniel. “Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management.” 2011. Web. 17 Feb 2020.
Vancouver:
Ballew SD. Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management. [Internet] [Masters thesis]. Western Carolina University; 2011. [cited 2020 Feb 17].
Available from: http://libres.uncg.edu/ir/listing.aspx?styp=ti&id=9011.
Council of Science Editors:
Ballew SD. Rheological characteristics of aqueous wax emulsions used
for the controlled release of pheromones as an alternative to the
use of pesticides for insect pest management. [Masters Thesis]. Western Carolina University; 2011. Available from: http://libres.uncg.edu/ir/listing.aspx?styp=ti&id=9011
Rutgers University
19.
Kalluri, Ram Chandra Murthy, 1984-.
Dynamics and rheology of a dilute suspension of elastic capsules.
Degree: MS, Mechanical and Aerospace Engineering, 2010, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056450
► Three-dimensional numerical simulations using front-tracking method are considered to study the dynamics and rheology of a suspension of elastic capsules in linear shear flow over…
(more)
▼ Three-dimensional numerical simulations using front-tracking method are considered to study the dynamics and
rheology of a suspension of elastic capsules in linear shear flow over a broad range of viscosity contrast (ratio of internalto- external fluid viscosity), shear rate (or, capillary number), and aspect ratio. First, we focus on the coupling between the shape deformation and orientation dynamics of capsules, and show how this coupling influences the transition from the tank-treading to tumbling motion. At low capillary numbers, three distinct modes of motion are identified: a swinging or oscillatory (OS) mode at a low viscosity contrast in which the inclination angle θ(t) oscillates but always remains positive; a vacillating-breathing (VB) mode at a moderate viscosity contrast in which θ(t) periodically becomes positive and negative, but a full tumbling does not occur; and a pure tumbling mode (TU) at a higher viscosity contrast. At higher capillary numbers, three types of transient motions occur, in addition to the OS and TU modes, during which the capsule switches from one mode to the other as (i) VB to OS, (ii) TU to VB to OS, and (iii) TU to VB. It is shown that the coupling between the shape deformation and orientation is the strongest in the VB mode. The numerical results are compared with the theories of Keller and Skalak, and Skotheim and Secomb. Significant departures from the two theories are discussed and related to the strong coupling between the shape deformation, inclination, and transition dynamics. We then address the
rheology of a dilute suspension of liquid-filled elastic capsules. We consider capsules of spherical resting shape for which only a steady tank-treading motion is observed. It is shown that the suspension exhibits a shear viscosity minimum at moderate values of the viscosity ratio, and high capillary numbers. The normal stress differences are shown to decrease with increasing capillary number at high viscosity ratios. Such non-trivial results can neither be predicted by the small-deformation theory, nor can be explained by the capsule geometry alone. Physical mechanisms underlying these novel results are studied by decomposing the particle stress tensor into a contribution due to the elastic stresses in the capsule membrane, and a contribution due to the viscosity differences between the internal and suspending fluids. It is shown that the elastic contribution is shear-thinning, but the viscous contribution is shear-thickening. The coupling between the capsule geometry, and the elastic and viscous contributions is analysed to explain the observed trends in the bulk
rheology.
Advisors/Committee Members: Kalluri, Ram Chandra Murthy, 1984- (author), Bagchi, Prosenjit (chair), Shan, Jerry (internal member), Shapley, Nina (outside member).
Subjects/Keywords: Rheology; Shear flow
Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Kalluri, Ram Chandra Murthy, 1. (2010). Dynamics and rheology of a dilute suspension of elastic capsules. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056450
Chicago Manual of Style (16th Edition):
Kalluri, Ram Chandra Murthy, 1984-. “Dynamics and rheology of a dilute suspension of elastic capsules.” 2010. Masters Thesis, Rutgers University. Accessed February 17, 2020.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056450.
MLA Handbook (7th Edition):
Kalluri, Ram Chandra Murthy, 1984-. “Dynamics and rheology of a dilute suspension of elastic capsules.” 2010. Web. 17 Feb 2020.
Vancouver:
Kalluri, Ram Chandra Murthy 1. Dynamics and rheology of a dilute suspension of elastic capsules. [Internet] [Masters thesis]. Rutgers University; 2010. [cited 2020 Feb 17].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056450.
Council of Science Editors:
Kalluri, Ram Chandra Murthy 1. Dynamics and rheology of a dilute suspension of elastic capsules. [Masters Thesis]. Rutgers University; 2010. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056450
California State University – Sacramento
20.
Cavanaugh, Jeff; Castaneda, Francisco; Jensen, Mikkel Herholdt.
Computational driving and analysis of microrheological instruments and data.
Degree: 2019, California State University – Sacramento
URL: http://hdl.handle.net/10211.3/214254
► During the Summer of 2019, my group and I set out to set up and test instruments for a new Soft Condensed Matter Lab. My…
(more)
▼ During the Summer of 2019, my group and I set out to set up and test instruments for a new Soft Condensed Matter Lab. My focus was on setting up and testing a set of Optical Tweezers. Our optical tweezers use a near infrared laser to trap a small silica bead for manipulation in a medium. This medium can be organic or inorganic and the goal is to characterize its viscoelastic properties. This can be helpful in studies of biofuels, biological environments, and biomedical science.
Subjects/Keywords: Rheology; Optical tweezers
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cavanaugh, Jeff; Castaneda, Francisco; Jensen, M. H. (2019). Computational driving and analysis of microrheological instruments and data. (Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.3/214254
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cavanaugh, Jeff; Castaneda, Francisco; Jensen, Mikkel Herholdt. “Computational driving and analysis of microrheological instruments and data.” 2019. Thesis, California State University – Sacramento. Accessed February 17, 2020.
http://hdl.handle.net/10211.3/214254.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cavanaugh, Jeff; Castaneda, Francisco; Jensen, Mikkel Herholdt. “Computational driving and analysis of microrheological instruments and data.” 2019. Web. 17 Feb 2020.
Vancouver:
Cavanaugh, Jeff; Castaneda, Francisco; Jensen MH. Computational driving and analysis of microrheological instruments and data. [Internet] [Thesis]. California State University – Sacramento; 2019. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/10211.3/214254.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cavanaugh, Jeff; Castaneda, Francisco; Jensen MH. Computational driving and analysis of microrheological instruments and data. [Thesis]. California State University – Sacramento; 2019. Available from: http://hdl.handle.net/10211.3/214254
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
21.
Zhang, Ying.
Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
.
Degree: Chemical Engineering, 2013, Queens University
URL: http://hdl.handle.net/1974/7777
► The morphology and mechanical properties of foams made out of ethylene-α-olefin copolymers (EC) having well-characterized rheological properties were investigated. The polymers differed in the amount…
(more)
▼ The morphology and mechanical properties of foams made out of ethylene-α-olefin copolymers (EC) having well-characterized rheological properties were investigated. The polymers differed in the amount of comonomer contained, type of comonomer and molecular weight, resulting in variable thermal properties and different rheological responses under shear and extensional flow. All of the octene-based copolymers with comparable rheological properties had similar foam morphology. However grades with low extensional viscosity and low crystallization points resulted in poor foams. Increasing density resulted in a higher secant modulus of the foamed samples. To further investigate the effects of material properties, trimethylolpropane trimethacrylate (TMPTMA) and triallyl trimesate (TAM) coagents were used to generate a series of PP derivatives through radical mediated melt state reactive modification. Coagent modification resulted in pronounced effects in the molecular weights and viscosities of the derivatives. However, evidence of long-chain branching (LCB) was only present in TAM modified PPs. Significant increases in the crystallization temperature, heat of fusion and crystallization rate were attributed to the formation of nanoparticles, which resulted in a heterogeneous nucleation effect, both for crystallization and foaming. Generally lower viscosities, coupled by strain hardening, enhanced nucleation and increased crystallization temperatures induced by the nanoparticles resulted in foams with higher expansion ratios and smaller cells, due to higher rates of cell growth, coupled with suppressed coalescence. Nanocomposites based on isotactic PP and nanosilica (SiO2) were prepared using a co-rotating twin-screw extruder (TSE) in order to investigate foaming on a larger scale. High shear stress, sufficient residence time, and high fill ratio in the melting section of the screw were the most important factors in achieving good nanosilica dispersion. Well-dispersed surface-modified hydrophobic SiO2 particles were effective nucleating agents for foaming, when used at loadings below 1 phr.
Subjects/Keywords: Rheology;
Polyolefin;
Foaming
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, Y. (2013). Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7777
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Ying. “Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
.” 2013. Thesis, Queens University. Accessed February 17, 2020.
http://hdl.handle.net/1974/7777.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Ying. “Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
.” 2013. Web. 17 Feb 2020.
Vancouver:
Zhang Y. Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
. [Internet] [Thesis]. Queens University; 2013. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/1974/7777.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang Y. Polyolefin Formulations for Improved Foaming: Effects of Molecular Structure and Material Properties
. [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/7777
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Ballew, Stephen Daniel.
Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management.
Degree: 2011, NC Docks
URL: http://libres.uncg.edu/ir/wcu/f/Ballew2011.pdf
► Most pesticides produce some risk of harm to the environment because pesticides are designed to kill or adversely affect living organisms (US EPA, 2010). It…
(more)
▼ Most pesticides produce some risk of harm to the environment because pesticides
are designed to kill or adversely affect living organisms (US EPA, 2010). It is desirable
that alternate, safer forms of pest control be developed. One alternative is the controlled
release of pest insect sex pheromones to produce a mating disruption effect (Ahmed et al.,
1993; Atterholt, 1996). Aqueous paraffin wax emulsions have shown much promise as
formulations for this controlled release when applied to tree bark or foliage (Atterholt et
al., 1996; Rice et al., 1997; Atterholt et al., 1998; Atterholt et al., 1999; Meissner et al.,
2000; de Lame, 2003). Soy wax has recently become of interest in pheromone
formulations because it is renewable, biodegradable, commercially available, and
acceptable for organic farming (Behle, 2008).
Emulsions exhibit complex flow behavior which can be studied using rheometry
(Macosko, 1994; Mezger, 2006). Rheometry refers to experimental techniques to
determine the fundamental relationships between force and deformation in materials
(Macosko, 1994). The rheological properties of emulsions are very important for
production, storage, and application of these formulations (Mezger, 2006). In this project the flow and viscoelastic properties of aqueous 30% paraffin wax and soy wax emulsions
were investigated using three different emulsifiers: sorbitan monostearate (Span 60®),
triethanolamine (TEA) stearate, and a 50%-50% mixture of both. Span 60® has already
been used to make effective emulsions for the controlled release of pheromones, and it is
food safe (Atterholt et al., 1996; Rice et al., 1997; Atterholt et al., 1998; Atterholt et al.,
1999; Meissner et al., 2000; de Lame, 2003). TEA stearate is widely used to make nontoxic
wax emulsions in the cosmetics industry (Wilkinson, 1940).
The investigations were carried out in both the rotational and oscillatory modes of
a parallel-plate rheometer. The flow curves at three different temperatures (15 °C, 25 °C
and 35 °C) of each emulsion were fitted with the Herschel-Bulkley model with the yield
points determined using the one tangent method. The resulting equations can predict
flow behavior at different conditions (Mezger, 2006). The emulsions were also tested
using a temperature sweep at low shear from 15 °C to 50 °C to investigate temperature
dependent changes. The viscoelastic properties were investigated using oscillatory shear
tests and expressed in terms of elastic modulus and loss modulus. This gives information
about time-dependant behavior like storage and the elastic character of the formulations
which were found to be weak gels (Mezger, 2006). The Span 60® emulsions displayed
faux shear-thickening behavior due to droplet subdivision while the other emulsions
generally displayed shear-thinning behavior. Each emulsion approaches an infinite shear viscosity. The yield points and other flow parameters for the emulsions varied with
temperature, depending on the formulation in question. All soy wax emulsions showed
an increase in viscosity between 45 °C…
Subjects/Keywords: Pheromones; Emulsions; Rheology
Record Details
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Share »
Record Details
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« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ballew, S. D. (2011). Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management. (Thesis). NC Docks. Retrieved from http://libres.uncg.edu/ir/wcu/f/Ballew2011.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ballew, Stephen Daniel. “Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management.” 2011. Thesis, NC Docks. Accessed February 17, 2020.
http://libres.uncg.edu/ir/wcu/f/Ballew2011.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ballew, Stephen Daniel. “Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management.” 2011. Web. 17 Feb 2020.
Vancouver:
Ballew SD. Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management. [Internet] [Thesis]. NC Docks; 2011. [cited 2020 Feb 17].
Available from: http://libres.uncg.edu/ir/wcu/f/Ballew2011.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ballew SD. Rheological characteristics of aqueous wax emulsions used for the controlled release of pheromones as an alternative to the use of pesticides for insect pest management. [Thesis]. NC Docks; 2011. Available from: http://libres.uncg.edu/ir/wcu/f/Ballew2011.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Dundee
23.
Mohammad, Maziah.
Development of foamed concrete : enabling and supporting design.
Degree: PhD, 2011, University of Dundee
URL: http://hdl.handle.net/10588/674d71b5-82dd-4a51-98ae-62e0145caa81
► Foamed concrete has considerable potential as a material for use in the construction industry. However, although some researches have been conducted on the characteristics of…
(more)
▼ Foamed concrete has considerable potential as a material for use in the construction industry. However, although some researches have been conducted on the characteristics of foamed concrete, thus far, knowledge on the behaviour of foamed concrete has been limited. Hence, predictions of the stability of foamed concrete under different conditions and mix constituents have been uncertain. The aim of the presented study is to investigate causes of instability of foamed concrete by examining its rheological properties and microstructure. This study explores the complex causes of instability in foamed concrete by examining the rheological parameters, the yield stress and the plastic viscosity, since the rheological properties affect the hardened state. Using flowability as a guide, the relationships are examined between yield stress and viscosity, specifically with reference to their effect on density and w/c ratio. Other factors affecting the rheological properties related to the proportions and fineness of the mix constituents are also considered. Thereafter, the microstructure of foamed concrete is examined to establish links with the rheological values and the relationship with stability. The microstructure, best described by the bubble sizes, has been found to be a function of yield stress, plastic viscosity, material fineness and surfactant types. The bubble diameters have been shown to range between 0.1 to 0.5 mm. Bubbles less than 0.35 mm in diameter correspond to stable mix with a drop in level of less than 5% in height in densities of 1000 kg/m3 and higher. The big bubbles link to unstable mixes and have been found to be a source of instability. Other chemical additions were shown to result in disintegration of bubbles. As this study unfolds, a relationship is established between bubbles and the yield stress values. Bubble sizes reduced when the yield stress increased. For flowability out of Marsh cone test taken between 1 to 2 minutes, the corresponding yield stress was between 6.0 N/m2 to 8.5 N/m2. For this range, the empirical bubble sizes were found to be between 0.33 to 0.35 mm in diameter. In examining the possible causes of instability, it was found that stability improved markedly with increase in density and lesser effect by other factors such as w/c ratio, constituent materials and specimen height. However, the rate of hardening was a dominant factor in stability as evidenced by the use of Calcium Sulfoaluminate cement, CSA and CEM I 52.5R cement which increased the setting times. Stability was drastically achieved even at lower density 300 kg/m3. Blends of CSA with CEM I 52.5R and fine fly ash, FAf, demonstrated similar results. This research has implications for the development of foamed concrete as a material that could be more widely used in certain construction contexts where stability in lightweight density foamed concrete is crucial. It has contributed to better understanding of the rheological properties and the effect on the microstructure, even though the results are based on empirical…
Subjects/Keywords: Foamed concrete; Rheology; Instability; Microstructure
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohammad, M. (2011). Development of foamed concrete : enabling and supporting design. (Doctoral Dissertation). University of Dundee. Retrieved from http://hdl.handle.net/10588/674d71b5-82dd-4a51-98ae-62e0145caa81
Chicago Manual of Style (16th Edition):
Mohammad, Maziah. “Development of foamed concrete : enabling and supporting design.” 2011. Doctoral Dissertation, University of Dundee. Accessed February 17, 2020.
http://hdl.handle.net/10588/674d71b5-82dd-4a51-98ae-62e0145caa81.
MLA Handbook (7th Edition):
Mohammad, Maziah. “Development of foamed concrete : enabling and supporting design.” 2011. Web. 17 Feb 2020.
Vancouver:
Mohammad M. Development of foamed concrete : enabling and supporting design. [Internet] [Doctoral dissertation]. University of Dundee; 2011. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/10588/674d71b5-82dd-4a51-98ae-62e0145caa81.
Council of Science Editors:
Mohammad M. Development of foamed concrete : enabling and supporting design. [Doctoral Dissertation]. University of Dundee; 2011. Available from: http://hdl.handle.net/10588/674d71b5-82dd-4a51-98ae-62e0145caa81
The Ohio State University
24.
Park, Keon Yang.
A kinetic-elastic approach for time-dependent rheological
data.
Degree: PhD, Graduate School, 1981, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487153664631616
Subjects/Keywords: Engineering; Rheology
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APA (6th Edition):
Park, K. Y. (1981). A kinetic-elastic approach for time-dependent rheological
data. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487153664631616
Chicago Manual of Style (16th Edition):
Park, Keon Yang. “A kinetic-elastic approach for time-dependent rheological
data.” 1981. Doctoral Dissertation, The Ohio State University. Accessed February 17, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1487153664631616.
MLA Handbook (7th Edition):
Park, Keon Yang. “A kinetic-elastic approach for time-dependent rheological
data.” 1981. Web. 17 Feb 2020.
Vancouver:
Park KY. A kinetic-elastic approach for time-dependent rheological
data. [Internet] [Doctoral dissertation]. The Ohio State University; 1981. [cited 2020 Feb 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487153664631616.
Council of Science Editors:
Park KY. A kinetic-elastic approach for time-dependent rheological
data. [Doctoral Dissertation]. The Ohio State University; 1981. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487153664631616
The Ohio State University
25.
Rhodes, James Franklin.
Rheology of vitreous coatings.
Degree: PhD, Graduate School, 1968, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486646765030448
Subjects/Keywords: Engineering; Rheology
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APA (6th Edition):
Rhodes, J. F. (1968). Rheology of vitreous coatings. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486646765030448
Chicago Manual of Style (16th Edition):
Rhodes, James Franklin. “Rheology of vitreous coatings.” 1968. Doctoral Dissertation, The Ohio State University. Accessed February 17, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1486646765030448.
MLA Handbook (7th Edition):
Rhodes, James Franklin. “Rheology of vitreous coatings.” 1968. Web. 17 Feb 2020.
Vancouver:
Rhodes JF. Rheology of vitreous coatings. [Internet] [Doctoral dissertation]. The Ohio State University; 1968. [cited 2020 Feb 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486646765030448.
Council of Science Editors:
Rhodes JF. Rheology of vitreous coatings. [Doctoral Dissertation]. The Ohio State University; 1968. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486646765030448
The Ohio State University
26.
Lee, Kiu Hee.
The transient and equilibrium study of time-dependent
polymer rheology data.
Degree: PhD, Graduate School, 1969, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486652007890017
Subjects/Keywords: Engineering; Rheology
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Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Lee, K. H. (1969). The transient and equilibrium study of time-dependent
polymer rheology data. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486652007890017
Chicago Manual of Style (16th Edition):
Lee, Kiu Hee. “The transient and equilibrium study of time-dependent
polymer rheology data.” 1969. Doctoral Dissertation, The Ohio State University. Accessed February 17, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1486652007890017.
MLA Handbook (7th Edition):
Lee, Kiu Hee. “The transient and equilibrium study of time-dependent
polymer rheology data.” 1969. Web. 17 Feb 2020.
Vancouver:
Lee KH. The transient and equilibrium study of time-dependent
polymer rheology data. [Internet] [Doctoral dissertation]. The Ohio State University; 1969. [cited 2020 Feb 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486652007890017.
Council of Science Editors:
Lee KH. The transient and equilibrium study of time-dependent
polymer rheology data. [Doctoral Dissertation]. The Ohio State University; 1969. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486652007890017
University of Alberta
27.
Zhao, Yi.
Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada.
Degree: MS, Department of Earth and Atmospheric
Sciences, 2009, University of Alberta
URL: https://era.library.ualberta.ca/files/xk81jm35n
► The Upper Devonian Grosmont reservoir in Alberta, Canada, is the single largest carbonate bitumen reservoir in the world, with an estimated 400 billion barrels of…
(more)
▼ The Upper Devonian Grosmont reservoir in Alberta,
Canada, is the single largest carbonate bitumen reservoir in the
world, with an estimated 400 billion barrels of bitumen in place.
The Grosmont bitumen formed from light crude oil via extensive
biodegradation, which produced extremely high in-situ viscosities
of >1 million cP. Forty nine samples from fifteen wells were
selected for rheological behavior, viscosity, and biodegradation
pattern analysis. In addition, various methods of viscosity
determination were compared. Results indicate that the Grosmont
bitumen is essentially a non-Newtonian fluid at in-situ conditions,
exhibiting a distinctive shear-thinning behavior at T <
40°C. Neglecting this character will cause inaccurate viscosity
measurements. The viscosity variations in the Grosmont reservoir
are cyclic with depth and are stratigraphically controlled. The
bitumen exhibits 3 levels of biodegradation. Biodegradation
parameters from hopanes and tricyclic terpanes may potentially be
used for bitumen quality prediction.
Subjects/Keywords: Biodegradation; Viscosity; Bitumen; Grosmont; Rheology
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to Zotero / EndNote / Reference
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APA (6th Edition):
Zhao, Y. (2009). Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/xk81jm35n
Chicago Manual of Style (16th Edition):
Zhao, Yi. “Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada.” 2009. Masters Thesis, University of Alberta. Accessed February 17, 2020.
https://era.library.ualberta.ca/files/xk81jm35n.
MLA Handbook (7th Edition):
Zhao, Yi. “Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada.” 2009. Web. 17 Feb 2020.
Vancouver:
Zhao Y. Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada. [Internet] [Masters thesis]. University of Alberta; 2009. [cited 2020 Feb 17].
Available from: https://era.library.ualberta.ca/files/xk81jm35n.
Council of Science Editors:
Zhao Y. Petrophysical properties of bitumen from the Upper Devonian
Grosmont reservoir, Alberta, Canada. [Masters Thesis]. University of Alberta; 2009. Available from: https://era.library.ualberta.ca/files/xk81jm35n
University of Alberta
28.
Rostami Najafabadi, Zahra.
Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.
Degree: MS, Department of Chemical and Materials
Engineering, 2015, University of Alberta
URL: https://era.library.ualberta.ca/files/8910jx45p
► One of the challenges that Vapor Extraction process might be conducted is the unpredictable precipitation of asphaltene from solvent-diluted bitumen that can cause process problems…
(more)
▼ One of the challenges that Vapor Extraction process
might be conducted is the unpredictable precipitation of asphaltene
from solvent-diluted bitumen that can cause process problems during
bitumen extraction in porous media. The objective of this study was
to investigate the rheological behaviour of Athabasca bitumen and
n-heptane solutions in the present of precipitates using a
rheometer and flow through porous media. Rheometry measurements
shown for solutions have the viscosity higher than 0.001 Pa·s and
less than 0.0005 Pa·s, the phase angle is around 90° out of phase
and the solutions are purely viscous; while for the solutions
having the viscosity around 0.0007 Pa·s, the phase angle is around
84° out of phase and the solution behave as a non-Newtonian liquid.
Also, the flow of heptane-bitumen solutions through a porous media
experiments shows that for bitumen-heptane solution having
viscosity around 0.0007 Pa·s, after 24 hours mixing of the
solutions, the predicted and measured friction factor did not
agreed. This disagreement might be because of both decrease the
void area between the particles due to the presence of solids and
non-Newtonian behaviour of the solution, which is in consistent
with the rheology measurement results.
Subjects/Keywords: rheology, porous media, asphaltene
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APA ·
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Manager
APA (6th Edition):
Rostami Najafabadi, Z. (2015). Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8910jx45p
Chicago Manual of Style (16th Edition):
Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.” 2015. Masters Thesis, University of Alberta. Accessed February 17, 2020.
https://era.library.ualberta.ca/files/8910jx45p.
MLA Handbook (7th Edition):
Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.” 2015. Web. 17 Feb 2020.
Vancouver:
Rostami Najafabadi Z. Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2020 Feb 17].
Available from: https://era.library.ualberta.ca/files/8910jx45p.
Council of Science Editors:
Rostami Najafabadi Z. Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/8910jx45p
Texas A&M University
29.
Viloria Ochoa, Marilyn.
Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations.
Degree: 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/4334
► This study presents a simplified and accurate procedure for selecting the rheological model which best fits the rheological properties of a given non- Newtonian fluid…
(more)
▼ This study presents a simplified and accurate procedure for selecting the
rheological model which best fits the rheological properties of a given non-
Newtonian fluid and introduces five new approaches to correct for tool joint
losses from expansion and contraction when hydraulics is calculated. The new
approaches are enlargement and contraction (E&C), equivalent diameter (ED),
two different (2IDs), enlargement and contraction plus equivalent diameter
(E&C+ED), and enlargement and contraction plus two different IDs (E&C+2IDs).
In addition to the Newtonian model, seven major non-Newtonian rheological
models (Bingham plastic, Power law, API, Herschel-Bulkley, Unified, Robertson
and Stiff, and Casson) provide alternatives for selecting the model that most
accurately represents the shear-stress/shear-rate relationship for a given non-
Newtonian fluid.
The project assumes that the model which gives the lowest absolute average
percent error (EAAP) between the measured and calculated shear stresses is the
best one for a given non-Newtonian fluid.
The results are of great importance in achieving correct results for pressure drop
and hydraulics calculations and the results are that the API rheological model (RP 13D) provides, in general, the best prediction of rheological behavior for the
mud samples considered (EAAP=1.51), followed by the Herschel-Bulkley,
Robertson and Stiff, and Unified models. Results also show that corrections with
E&C+2IDs and API hydraulics calculation give a good approximation to
measured pump pressure with 9% of difference between measured and
calculated data.
Advisors/Committee Members: Juvkam-Wold, Hans (advisor), Shubert, Jerome (committee member), Ugaz, Victor (committee member), Valko, Peter (committee member).
Subjects/Keywords: rheology; drilling
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APA (6th Edition):
Viloria Ochoa, M. (2006). Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Viloria Ochoa, Marilyn. “Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations.” 2006. Thesis, Texas A&M University. Accessed February 17, 2020.
http://hdl.handle.net/1969.1/4334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Viloria Ochoa, Marilyn. “Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations.” 2006. Web. 17 Feb 2020.
Vancouver:
Viloria Ochoa M. Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations. [Internet] [Thesis]. Texas A&M University; 2006. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/1969.1/4334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Viloria Ochoa M. Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations. [Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/4334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Plymouth
30.
Golden, Kevin.
Controlled stress rheometry.
Degree: PhD, 1990, University of Plymouth
URL: http://hdl.handle.net/10026.1/1911
Subjects/Keywords: 530.41; Rheology
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APA (6th Edition):
Golden, K. (1990). Controlled stress rheometry. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/1911
Chicago Manual of Style (16th Edition):
Golden, Kevin. “Controlled stress rheometry.” 1990. Doctoral Dissertation, University of Plymouth. Accessed February 17, 2020.
http://hdl.handle.net/10026.1/1911.
MLA Handbook (7th Edition):
Golden, Kevin. “Controlled stress rheometry.” 1990. Web. 17 Feb 2020.
Vancouver:
Golden K. Controlled stress rheometry. [Internet] [Doctoral dissertation]. University of Plymouth; 1990. [cited 2020 Feb 17].
Available from: http://hdl.handle.net/10026.1/1911.
Council of Science Editors:
Golden K. Controlled stress rheometry. [Doctoral Dissertation]. University of Plymouth; 1990. Available from: http://hdl.handle.net/10026.1/1911
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Open Access Theses and Dissertations
