Relevant bibliographies by topics / Rheology data

Academic literature on the topic 'Rheology data'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Rheology data.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Rheology data"

1

Xu, Zhe, and Yoshiaki Takahashi. "Molecular Weight Estimation of Cellulose in Ionic Liquid Solution by Fitting Dynamic Viscoelastic Data to Rouse Model." Nihon Reoroji Gakkaishi 45, no. 2 (2017): 119–24. http://dx.doi.org/10.1678/rheology.45.119.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Burda, Zdzislaw, Malgorzata J. Krawczyk, Krzysztof Malarz, and Malgorzata Snarska. "Wealth Rheology." Entropy 23, no. 7 (June 30, 2021): 842. http://dx.doi.org/10.3390/e23070842.

Full text
Abstract:
We study wealth rank correlations in a simple model of macroeconomy. To quantify rank correlations between wealth rankings at different times, we use Kendall’s τ and Spearman’s ρ, Goodman–Kruskal’s γ, and the lists’ overlap ratio. We show that the dynamics of wealth flow and the speed of reshuffling in the ranking list depend on parameters of the model controlling the wealth exchange rate and the wealth growth volatility. As an example of the rheology of wealth in real data, we analyze the lists of the richest people in Poland, Germany, the USA and the world.
APA, Harvard, Vancouver, ISO, and other styles
3

Vieli, Andreas, Antony J. Payne, Zhijun Du, and Andrew Shepherd. "Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, no. 1844 (May 31, 2006): 1815–39. http://dx.doi.org/10.1098/rsta.2006.1800.

Full text
Abstract:
In this study, the flow and rheology of pre-collapse Larsen B ice shelf are investigated by using a combination of flow modelling and data assimilation. Observed shelf velocities from satellite interferometry are used to constrain an ice shelf model by using a data assimilation technique based on the control method. In particular, the ice rheology field and the velocities at the inland shelf boundary are simultaneously optimized to get a modelled flow and stress field that is consistent with the observed flow. The application to the Larsen B ice shelf shows that a strong weakening of the ice in the shear zones, mostly along the margins, is necessary to fit the observed shelf flow. This pattern of bands with weak ice is a very robust feature of the inversion, whereas the ice rheology within the main shelf body is found to be not well constrained. This suggests that these weak zones play a major role in the control of the flow of the Larsen B ice shelf and may be the key to understanding the observed pre-collapse thinning and acceleration of Larsen B. Regarding the sensitivity of the stress field to rheology, the consistency of the model with the observed flow seems crucial for any further analysis such as the application of fracture mechanics or perturbation model experiments.
APA, Harvard, Vancouver, ISO, and other styles
4

Kaplan, Jonathan, Alessandra Bonfanti, and Alexandre Kabla. "RHEOS.jl -- A Julia Package for Rheology Data Analysis." Journal of Open Source Software 4, no. 41 (September 24, 2019): 1700. http://dx.doi.org/10.21105/joss.01700.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Seryo, Naoki, John J. Molina, and Takashi Taniguchi. "Select Applications of Bayesian Data Analysis and Machine Learning to Flow Problems." Nihon Reoroji Gakkaishi 49, no. 2 (April 15, 2021): 97–113. http://dx.doi.org/10.1678/rheology.49.97.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Puisto, Antti, Xavier Illa, Mikael Mohtaschemi, and Mikko Alava. "Modeling the rheology of nanocellulose suspensions." Nordic Pulp & Paper Research Journal 27, no. 2 (May 1, 2012): 277–81. http://dx.doi.org/10.3183/npprj-2012-27-02-p277-281.

Full text
Abstract:
Abstract The transient response of a Population Balance based colloidal rheology model is studied in the context of nanofiber suspension rheology research. The model is calibrated against experimental rheology data for cellulose nano-whisker suspension and then subjected to transient shears. The non-equilibrium aggregate size distributions are reported.
APA, Harvard, Vancouver, ISO, and other styles
7

Dees, Marc, Marc Mangnus, Nicolaas Hermans, Wouter Thaens, Anne-Sophie Hanot, and Peter Van Puyvelde. "On the pressure correction of capillary melt rheology data." Rheologica Acta 50, no. 2 (January 22, 2011): 117–24. http://dx.doi.org/10.1007/s00397-011-0529-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Schwarz, W. H. "The Rheology of Saliva." Journal of Dental Research 66, no. 1_suppl (February 1987): 660–66. http://dx.doi.org/10.1177/00220345870660s109.

Full text
Abstract:
The rheology of saliva affects the coating and lubrication of oral surfaces and the consistency of ingested foods. Salivary gland dysfunction can cause tissue damage and dysphagia. Therefore, we have considered the problem of designing a synthetic saliva for medical management. Also, we have measured certain rheological properties [shear-dependent viscosity η (k)] and the frequency-dependent moduli [G′(f) and η′(f)] of normal stimulated whole saliva. Analysis of the rheological data and consideration of requirements for using artificial saliva have resulted in a better understanding of the rheological functions of natural saliva and the desirable characteristics of synthetic saliva. In addition, we have measured rheological properties of two commercial saliva substitutes for comparison.
APA, Harvard, Vancouver, ISO, and other styles
9

Schwarz, W. H. "The Rheology of Saliva." Journal of Dental Research 66, no. 2_suppl (February 1987): 660–66. http://dx.doi.org/10.1177/00220345870660s209.

Full text
Abstract:
The rheology of saliva affects the coating and lubrication of oral surfaces and the consistency of ingested foods. Salivary gland dysfunction can cause tissue damage and dysphagia. Therefore, we have considered the problem of designing a synthetic saliva for medical management. Also, we have measured certain rheological properties [shear-dependent viscosity η(κ)] and the frequency-dependent moduli [G'(f) and η'(f)] of normal stimulated whole saliva. Analysis of the rheological data and consideration of requirements for using artificial saliva have resulted in a better understanding of the rheological functions of natural saliva and the desirable characteristics of synthetic saliva. In addition, we have measured rheological properties of two commercial saliva substitutes for comparison.
APA, Harvard, Vancouver, ISO, and other styles
10

Fullard, Luke, Eric Breard, Clive Davies, Pierre-Yves Lagrée, Stéphane Popinet, and Gert Lube. "Testing the μ(I) granular rheology against experimental silo data." EPJ Web of Conferences 140 (2017): 11002. http://dx.doi.org/10.1051/epjconf/201714011002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Rheology data"

1

Tan, Syn Yee, and Syn Yee Tan. "Understanding The Lithosphere Rheology Of Sumatra Using GPS Data Obtained Through Earthquakes." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/621973.

Full text
Abstract:
Crustal deformation and associated earthquakes are an integral part of the plate tectonics of Earth, especially in an active subduction zone like Sumatra. Alongside that, mantle rheology governs mantle’s dynamics, yet little is understood about how deformation is distributed at depth. Sumatra allows for a chance to investigate the post-seismic crustal deformation with its frequent and large earthquakes, thereby understanding lithosphere rheology. Utilizing time series data obtained from GPS stations and applying simple analytical logarithmic function, the average post-seismic time was set at 100 days for all the earthquakes. Using Maxwell’s viscosity equation, the asthenosphere beneath Sumatra is calculated to be at 5.53±1.14 × 10¹⁷ 𝑃𝒶𝑠. The asthenosphere viscosity estimated falls within the range of estimated values of other researches, which ranges from 3× 10¹⁷ 𝑃𝒶𝑠 to 1× 10¹⁹ 𝑃𝒶𝑠. The lithosphere rheology of Sumatra might be a result of a thick, viscoelastic slab overlaying a weak, low viscosity asthenosphere. Using the Burger’s model, an inelastic transient viscoelastic deformation of the crust and asthenosphere happen post-earthquake, allowing for a fast relaxation. Large uncertainties remain regarding lithosphere rheology and further research is needed to increase the understanding of subsurface post-seismic deformation.
APA, Harvard, Vancouver, ISO, and other styles
2

Peña, Hormazábal Carlos [Verfasser]. "Postseismic deformation modelling constrained by geodetic and seismic data in central Chile: Implications for lower-crustal rheology / Carlos Peña Hormazábal." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/1231792779/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bai, Jinshuai. "A data-driven smoothed particle hydrodynamics method for fluids." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/211354/1/Jinshuai_Bai_Thesis.pdf.

Full text
Abstract:
This thesis proposed a novel Data-Driven Smoothed Particle Hydrodynamics (DDSPH) method that, instead of applying the empirical rheological models, utilizes discrete experimental datasets to close the Navier-Stokes equations for hydrodynamic modelling. Besides, the chained hashing algorithm is applied to improve the efficiency of the data retrieval and the robustness of the method with respect to the noisy data is achieved via adding a variable that qualifies the relevance of data points to the clusters. The proposed DDSPH method introduces a new avenue for hydrodynamic modelling and has great potential for modelling complex fluids with highly nonlinear rheological relationships.
APA, Harvard, Vancouver, ISO, and other styles
4

Hidayat, Panuntun. "Poroelastic rebound following the 2011 Tohoku-oki earthquake (Mw=9.0) as deduced from geodetic data and its application to infer the Poisson's ratio." Kyoto University, 2019. http://hdl.handle.net/2433/242618.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Yaghoobi, Rafi Jalaleddin. "Applying "Real Time Grouting Control Method" in sedimentary rock with gotvand dam data." Thesis, KTH, Jord- och bergmekanik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25800.

Full text
Abstract:
“Real Time Grouting Control Method” is a pioneer idea informulating grouting works which provides possibility for monitoring groutingprocess in real time to optimize it to performance and cost. Currently this theoryhas been tested with data from tunnels in Stockholm. In this report the effort istesting the validity of this method in a kind of geology which is situated insouthwest of Iran. Data are taken from the Gotvand dam project which is underconstruction on Karoon River. To achieve this goal, Tests are performed inStockholm by using the cement collected from the dam site to obtain rheologicaland penetrability properties of the grout mix which is in use in Gotvand project.Pressure and flow values are recorded in during grouting and have beenemployed as input data in this report. By developing a proper application, resultshave been analysed and discussed in detail. It has been shown that in studiedcases the theory can provide promising results and this method is applicable inthis project although there is a need for site investigation and testing different kindof grout mixes to precise results and be able to drive a general conclusion.
QC 20101009
APA, Harvard, Vancouver, ISO, and other styles
6

Ianni, Francesca. "Complex behavior of colloidal suspensions undershear: dynamics investigation through light scatteringtechniques." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2007. http://tel.archives-ouvertes.fr/tel-00142056.

Full text
Abstract:
Ce travail expérimental cherche à mieux
caractériser, au moyen des techniques de diffusion de la lumière,
la dynamique de certains systèmes colloidaux qui montrent un
comportement rhéologique complexe. Il s'articule autour de deux
points: le rajeunissement et la formation des bandes de
cisaillement dans un système colloidal vitreux, et le
phenomène du jamming dans une suspension concentrée de particules
chargées. Dans une suspension de Laponite -système modèle pour les
colloides vitreux- la compétition entre le rajeunissement
du au cisaillement et le vieillissement a été étudié pendant
l'écoulement, alors qu'aprés l'arret de l'écoulement deux régimes
de vieillissement ont été observés. La localisation du
cisaillement a été mis en evidence à des taux faibles de
cisaillement global, en mesurant les profils de vitesse du fluide,
mesure qui en outre, par ses oscillations, a révélé un
comportement de stick-slip. D'autre part dans une suspension
concentrée de particules de silice dans le régime de jamming, nous
nous sommes interessés à la dynamique des structures induites par
l'écoulement et avons mis en évidence la présence de particules
plus lentes pendant le cisaillement, puis avons étudiés la
relaxation de la dynamique des particules après l'arret de
l'écoulement en fonction des contraintes appliquées.
APA, Harvard, Vancouver, ISO, and other styles
7

Drappier, Julie. "Plateaux de contrainte et bandes de cisaillement dans les fluides complexes." Phd thesis, Université Paris-Diderot - Paris VII, 2004. http://tel.archives-ouvertes.fr/tel-00005909.

Full text
Abstract:
Certains fluides complexes présentent un plateau horizontal de la contrainte en fonction du cisaillement dans leur courbe d'écoulement. Sur ce plateau une structuration de l'écoulement en bandes de cisaillement est parfois observée. Trois fluides complexes sont étudiés, qui possèdent tous trois un plateau horizontal dans leur courbe d'écoulement. Les techniques expérimentales utilisées : la rhéologie, la mesure de profils de vitesse par IRM, et des expériences de biréfringence ont permis de mettre en évidence trois origines à ce plateau. Une première solution de micelles géantes dans le régime semi-dilué montre le développement d'une bande biréfringente et fortement cisaillée sur le plateau, qui croît avec le cisaillement. Un deuxième système, une phase lamellaire avec une texture oignon présente une structuration en bande de vorticité sur le plateau horizontal. Enfin pour une troisième solution de micelles géantes dans le régime dilué, le plateau est expliqué par du glissement à la paroi. La diminution de la traînée turbulente, observée pour ce système, semble également due à du glissement.
APA, Harvard, Vancouver, ISO, and other styles
8

Tatou, Mouna. "Nanocomposites modèles silice-latex : Etude des propriétés rhéologiques et de la structure des charges et des chaînes par Diffusion de Neutrons aux Petits Angles." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-00570362.

Full text
Abstract:
Pour comprendre les mécanismes microscopiques du renforcement dans les nanocomposites, nous avons mis en œuvre un système nanocomposite modèle composé de nanoparticules de silice incorporées dans une matrice du copolymère PMMA/PBuA faite par filmification d'un latex. La formation des échantillons se fait par évaporation du solvant - l'eau – du système colloïdal mixte latex et silice. La structure de la charge peut être contrôlée par le pH en solution et la fraction volumique de la silice. La combinaison de diffusion de neutrons aux petits angles et microscopie électronique à transmission nous a permis d'établir un diagramme du nombre d'agrégation de la silice. Les tests mécaniques en traction uni-axiale sur des échantillons de structure définie nous ont donné accès à la relation entre la structure des charges et la rhéologie des nanocomposites. L'augmentation du nombre d'agrégation moyen augmente le renforcement du module de Young, et mène à une rupture précoce des films. Un optimum entre fort renforcement et grande déformation avant rupture peut être trouvé en s'intéressant à l'énergie de rupture. Lorsque l'on étudie la structure des chaînes dans les nanocomposites, il faut créer le contraste moyen nul pour la silice en introduisant des chaînes deutériées D. Nous avons pu suivre l'interdiffusion des chaînes H et D durant le recuit dans deux systèmes. Pour suivre la dissolution des billes de latex dans le polymère fondu, nous avons mis en place une modélisation quantitative des données structurales. Elle montre que la présence de la silice limite la mobilité des chaînes dans les nanocomposites.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Rheology data"

1

International Conference on Computational Methods and Experimental Measurements (4th 1989 Capri, Italy). Computers and experiments in fluid flow. Edited by Carlomagno G. M and Brebbia C. A. 1938-. Southampton: Computational Mechanics, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

International, Conference on Computational Methods and Experimental Measurements (4th 1989 Capri Italy). Computers and experiments in fluid flow: Proceedings of the fourth International Conference on Computational Methods and Experimental Measurements, Capri, Italy, May 1989. Southampton [England]: Computational Mechanics, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pappetti, F. An introduction to parallel computational fluid dynamics. New York: Nova Science Publishers, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

N, Burganos V., and International Conference on Computational Methods in Water Resources (12th : 1998 : Crete, Greece), eds. Computational methods in water resources XII. Southhampton, UK: Computational Mechanics Publications, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

M, Hafez M., Morinishi Koji, Periaux Jacques, and Satofuka N, eds. Computational fluid dynamics for the 21st century: Proceedings of a symposium honoring Prof. Satofuka on the occasion of his 60th birthday, Kyoto, Japan, 15-17 July 2000. Berlin: Springer, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Habib, Ammari, Capdeboscq Yves 1971-, and Kang Hyeonbae, eds. Multi-scale and high-contrast PDE: From modelling, to mathematical analysis, to inversion : Conference on Multi-scale and High-contrast PDE:from Modelling, to Mathematical Analysis, to Inversion, June 28-July 1, 2011, University of Oxford, United Kingdom. Providence, R.I: American Mathematical Society, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

1965-, Holmes Robert R., and Geological Survey (U.S.), eds. Laboratory procedures and data reduction techniques to determine rheologic properties of mass flows. Rolla, Mo: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Lubricants, ASTM Committee D.-2. on Petroleum Products and. The Relationship Between High Temperature Oil Rheology and Engine Operation: A Status Report (Astm Data Series Publication). Astm Intl, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Computer Aided Analysis of the Stress and Strain of Resp of High Polymer. CRC, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Computer Aided Analysis of the Stress and Strain of Resp of High Polymer. CRC, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Rheology data"

1

Vernel, J., M. J. Kubát, R. W. Rychwalski, and J. Kubat. "Bulk Moduli from Physical Aging and Stress Relaxation Data." In Progress and Trends in Rheology V, 447–48. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_216.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Maier, D., A. Eckstein, C. Friedrich, and J. Honerkamp. "Evaluation of Models Combining the Molecular Weight Distribution with Rheological Data." In Progress and Trends in Rheology V, 289–90. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_134.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Franck, A. J. P., T. Van Dyke, and D. Mead. "Structural Information from Rheological Data with a New Software Evaluation Package." In Progress and Trends in Rheology V, 471–72. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_228.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Möginger, B., H. C. Ludwig, A. Kech, and P. Eyerer. "Creep Behaviour of Short Glass Fiber Reinforced and Virgin Polybutylene Terephthalate (PBT) - a Comparison of Experimental Data to Modeled Data Using The Elementary Volume Concept (EVC)." In Progress and Trends in Rheology V, 437–38. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_211.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Rusdi, M. S., M. Z. Abdullah, Mohd Sharizal Abdul Aziz, S. A. H. A. Seman, and M. H. Hassan. "Solder Paste’s Rheology Data for Stencil Printing Numerical Investigations." In Recent Progress in Lead-Free Solder Technology, 299–310. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93441-5_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Elster, C., and J. Honerkamp. "Inferring a retardation spectrum from creep data by a modified maximum entropy method." In Third European Rheology Conference and Golden Jubilee Meeting of the British Society of Rheology, 147–49. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0781-2_55.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Roths, T., D. Maier, C. Friedrich, and J. Honerkamp. "Determination of Relaxation Time Spectra from Rheological Data using an Edge Preserving Regularization Method." In Progress and Trends in Rheology V, 305–6. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_142.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Forte, Alessandro M., and W. Richard Peltier. "Gross Earth Data and Mantle Convection: New Inferences of Mantle Viscosity." In Glacial Isostasy, Sea-Level and Mantle Rheology, 425–44. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3374-6_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Bartoš, J., and J. Krištiak. "Empirical Correlations Between Free Volume Fractions from Pals Data and Various Dynamic Quantities in Ortho-Terphenyl." In Progress and Trends in Rheology V, 246–47. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_113.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Trupin, Andrew S., and John M. Wahr. "Constraints on Long-Period Sea Level Variations from Global Tide Gauge Data." In Glacial Isostasy, Sea-Level and Mantle Rheology, 271–84. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3374-6_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Rheology data"

1

Ashrafi, Nariman. "Rheology of Selected Honeys." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10583.

Full text
Abstract:
In this study, rheological properties of five honey samples (Acacia, Citrus Blossom, Fynbos, Bluegum and Raw) were measured. Steady shear and dynamic rheological tests confirmed almost Newtonian behavior for all samples examined over the temperature range of 0–60° C. The water contents of honeys were between 15% and 23%. Fitting of the data in the temperature experiment, showed that primarily expected Arrhenius model is not the best model. Excluding the Raw honey that was possible to be fitted to the said model, the other honey samples were best fitted to a Hyperbolic Tangent model. For the fitted Raw honey however, the activation energy was evaluated to be 95783 J/kg mole. While some rather exceptional viscoelastic properties were observed for the samples, the thixotropic effects were virtually nonexistent. These findings can provide insight into the microstructural, physiological and sensory changes. Also, the study completes a series of studies on rheology of honeys conducted worldwide.
APA, Harvard, Vancouver, ISO, and other styles
2

Mointire, V. L., A. J. Frangos, G. B. Rhee, G. S. Eskin, and R. E. Hall. "RHEOLOGY AND CELL ACTIVATION." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643988.

Full text
Abstract:
The subject of this work is to examine the hypothesis that some sublytic levels of mechanical perturbation of cells can stimulate cell metabolism. As a marker metabolite, we have chosen arachidonic acid. Principal metabolites for platelets include the cyclooxygenase product thromboxane A2(TXA2) and the lipoxygenase product 12-hydroperoxy-eicosatetraenoic acid (12-HPETE). Polymorphonuclear leukocytes (PMNLs) initally produce principally 5-HPETE, somtimes leading to the formation leukotrienes, though many other metabolites of arachidonic acid have been isolated from activated neutrophils. Human umbilical vein endothelial cells utilize arachidonic acid to produce mainly prostaglandin I2(PGI2). All of these metabolites are biologically active and modulate cell function - sometimes in quite contrasting ways. We will show that levels of sublytic mechanical stress exposure can stimulate arachidonic acid metabolism in all three of the cell types mentioned above. The biological implications of this stress/metabolism coupling may be quite far reaching.Human platelets, leukocytes and endothelial cells all appear to be sensitive to mechanical stress induced activation of arachidonic acid metabolism. Sheared PRP exhibited greatly increased synthesis of 12-HETE and surprisingly little thromboxane B2 production. This indicates that shear stress stimulation of platelets may produce quite different arachidonic acid metabolism than that seen with many direct chemical stimuli, such as thrombin or collagen.Our data demonstrate that a substance derived from shear induced platelet activation may activate the C-5 lipoxygenase of human PMNL under stress, leading to the production of LTB4. We hypothesize that this substance maybe 12-HPETE. LTB4 is known to be a very potent chemotactic factor and to induce PMNL aggregation and degranulation. Our studies provide further evidence that lipoxygenase products of one cell type can modulate production of lipoxygenase products in a second cell type, and that shear stress can initiate cell activation. This kind of coupling could have far reaching implications in terms of our understanding of cell/cell interaction in flowing systems, such as acute inflammation, artificial organ implantation and tumor metastasis.The data on PGI2 production by endothelial cells demonstrate that physiological levels of shear stress can dramatically increase arachidonic acid metabolism. Step increases in shear stress lead to a burst in production of PGI2 which decayed to a steady state value in several minutes. This longer term stimulation of prostacyclin production rate increased linearly with shear stress over the range of 0-24 dynes/cm2. In addition, pulsatile flow of physiological frequency and amplitude caused approximately 2.4 times the PGI2 production rate as steady flow with the same mean stress. Although only PGI2 was measured, it is likely that other arachidonic acid metabolites of endothelial cells are also affected by shear stress.The ability of cells to respond to external stimuli involves the transduction of a signal across the plasma membrane. One such external stimulus appears to be fluid shear stress. Steady shear flow induces cell rotation in suspended cells, leading to a periodic membrane loading, with the peak stress proportional to the bulk shear stress. On anchorage-dependent cells, such as endothelial cells, steady shear stress may act by amplifying the natural thermal or Brownian fluttering or rippling of the membrane. There are several possible mechanisms by which shear stress induced membrane perturbation could mimic a hormone/receptor interaction, leading to increased intracellular metabolism. Shear stress may induce increased phospholipase C activity, caused by translocation of the enzyme, increased substrate (arachidonic acid) pool availability to phospholipase C (particularly from that stored in phosphoinositols) due to shear-induced membrane movements or changes in membrane fluidity, direct activation of calcium - activated phospholipase A2 by increased membrane calcium ion permeability, or most probably by a combination of these mechanisms.
APA, Harvard, Vancouver, ISO, and other styles
3

Vajargah, Ali Karimi, and Eric van Oort. "Automated Drilling Fluid Rheology Characterization with Downhole Pressure Sensor Data." In SPE/IADC Drilling Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/173085-ms.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Grabowski, F. E. "RHEOLOGY AND PRIMARY HEMOSTASIS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643986.

Full text
Abstract:
Overview The adhesion-aggregation of platelets to a site of vessel wall injury is a quintessential blood flow phenomenon. Firstly, platelets are driven to the vicinity of the vessel wall by a form of convective diffusion in which red cells both mechanically augment the effective platelet diffusivity (Turitto et al., Ind. Eng. Chem. Fund. 11:216-223, 1972; Grabowski et al., Ind. Eng. Chem. Fund. 11:224-232, 1972) and enhance the near-wall piatelet concentration (Ti11es and Eckstein, Microvasc Res., In press, 1987). Secondly, red cells subjected to physiologic shear forces are capable of secreting sufficient adenine nucleotides to induce primary platelet aggregation without themselves undergoing frank lysis (Reimers et al, Blood 64:1200-1206, 1984). This "humoral" effect of erythrocytes is likely to contribute to primary hemostasis in a shear stress-dependent manner. Thirdly, endothelial cells are able to modulate platelet aggregation at a site of vessel injury by producing prostacyclin (and perhaps other antithrombotic substances) in a manner which increases with vessel shear rate (Grabowski et al, Blood 62:301a, 1983); production for a large range of arterial shear rates appears to be limited by plasma-borne substrate (arachidonate). This manner of production ensures a concentration of prostacyclin in the near-wall region which remains relatively independent of shear rate.Imaging primary hemostasis. In our work, epi-fluorescence videomicroscopy has allowed real time imaging of platelet adhesion-aggregation to a simulated vessel wall injury. The injury model is an endothelial cell monolayer (ECM) across which, prior to ECM exposure to flowing blood, a 6-0 sterile suture is drawn in a direction transverse to flow. Microinjuries result which measure 70 ± 15μm (Mean ± SD) in width. The fluorescent label is the TAB murine monoclonal antibody (courtesy of Dr. R.P. McEver) directed against human platelet GPIIB, together with a fluorescein-conjugated goat F(ab')2 against murine inmunoglobulin. The injured ECM's, grown to confluence on rectangular cover glasses precoated with microfibrillar collagen, comprise one wall of a flow chamber mounted on a vertical microscope stage. On microinjury sites and at shear rates of 100 to 700 sec-1, computer-enhanced video images show adherence, remodelling and growth of chains of platelet aggregates. Aligned with the flow direction, these chains have a spacing of approximately 30)im, a length similar to the average endothelial cell diameter. One may speculate that such chains provide a scaffold for wound healing insofar as they are likely rich in agents chemotactic for leukocytes and in platelet-derived growth factor.Modulatory role of endothelium. When the ECM's are pre treated with 1.0 mM FC lysine acetyl sal icy late (LA), aggregate length increases (P<0.001) up totwo-fold, outflow levels by RIA of serum thromboxane B2 increase (8 of 8 paired runs), and outflow levels of prostacyclin by RIA for 6-Keto PGFiot decrease (5 of 7 paired runs). The Table gives data for one of four similar experiments at 270 sec-1 and following five minutes of flow. These data imply that products of ECM which are inhibitable by aspirin modulate local adhesion-aggregation; their inhibition, as by vasculitis or drugs, may give rise to thrombotic states.Bleeding disorders. Aggregate length is reduced in von Willebrand's disease (4 patients), Hermansky-Pudlak syndrome (2 patients), and after 300 mg oral aspirin (Tablet 4 donors). The reduction in the first two, however, is greater (P<0.01) than that for oral aspirin. With oral aspirin, further, there is a paradoxic increase in the percent platelet coverage of the injury area. Summary. Rheology has profound effects on the rate, structure, and modulation of primary hemostasis. Many of these effects can be studied via real-time, epi-fluorescence videomicroscopy of platelet adhesion-aggregation to a site of injury to an endothelial cell monolayer exposed to flowing blood. The model described has application to the study of thrombotic and hemostatic disorders and unstable angina.
APA, Harvard, Vancouver, ISO, and other styles
5

Pease, Leonard F., Judith A. Bamberger, and Michael J. Minette. "Implications of Non-Bingham Rheology." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11841.

Full text
Abstract:
Abstract One of the key challenges now facing the US Department of Energy (DOE) is the fate of radioactive waste remaining from World War II and the Cold War, which is stored underground in tanks some 75 feet in diameter and over 30 feet tall. Over time, the waste has segmented into multiple layers with sludges and slurries at the bottom with salt crust layers often at the top and liquid in between. DOE’s current official baseline plans call for remaining sludges and slurries to be removed from the tanks and converted into a stable glass waste form. Minimizing worker exposure to radiation drives DOE to use slurry processing techniques to suspend, mobilize, transport, mix, and process the waste. Therefore, a clear and quantitative understanding of Hanford waste rheology is essential for the success of the DOE mission. Historically much of the waste has been characterized using Eugene Bingham’s century old model that provides a straight line fit to higher shear rate data with the intercept suggesting a yield stress and the slope providing the consistency. Yet, Bingham fits overestimate the shear stress at a given shear rate for low to intermediate shear rates, exactly the range of shear rates typically encountered in pipe flow, where shear rates peak along the pipe wall and vanish in the center. This model produces a fictitious yield stress for some of the wastes that do not exhibit yield phenomena. While overestimating the yield stress may be prudent, safe, and conservative for some applications (e.g., pump sizing to ensure that pumps can handle yield stresses), overestimating the rheology may be inaccurate and non-conservative for other applications (e.g., eroding settled particle beds). Therefore, this paper evaluates the slurry rheology of Hanford and Savannah River wastes using a more modern rheological model that fits the full range of experimental data. Although a bias has been recognized and alternative models proposed, the magnitude of this bias and the implications for tank waste have only been qualitatively suggested. The purpose of this paper is to evaluate quantitatively implications of the poor quality of fit between a Bingham model for rheology and experimental data at modest shear rates. We first demonstrate the magnitude of the bias between the data and the Bingham extrapolation. We then evaluate quantitatively the velocity profile under laminar conditions. This analysis shows that the bias may be large (hundreds of percent or more) at modest shear rates and that modest shear rates dominate pipe velocity profiles.
APA, Harvard, Vancouver, ISO, and other styles
6

Khan, Abdul Muqtadir, Shashin Sharan, Kalyan Venugopal, Lalitha Venkataramanan, and Asim Najmi. "Data Engineering and Supervised ML Enabled Predictive Model for HPHT Fracturing Fluid Rheology - Digital Laboratory Approach." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22085-ms.

Full text
Abstract:
Abstract High-temperature rheology testing is critical for all fracturing applications to design the well-specific breaker and additive schedule. The rheology depends on the source water quality, testing temperatures, shear profiles, and additives-stabilizers-breaker combinations used for the test. The process for each treatment requires extensive staff to fine-tune the optimal fluid formulations requiring proportional laboratory resources and time. Data analytics intelligent system design can be implemented beyond analytical mathematical correlations to reduce the time and resource requirements. A total of 820 rheology tests were conducted using the high-pressure/high-temperature (HP/HT) rheometer Chandler 5550 and ISO 13503-1 guideline. Temperatures ranged from 200 to 336°F and fluid systems consisted of borate and metallic crosslinkers. A structured database with 40 input-output features was prepared to digitize each rheology curve by incorporating the source water parameters, laboratory setup details, additive concentrations, and rheology (consistency and behavior indices) results. ML algorithms and techniques were then applied to the database to predict the rheology for given testing parameters. The algorithm inputs were prepared as the source water quality (i.e., monovalent/divalent ions, minerals, salinity, hardness etc.) and the test temperature. The outputs predicted were set to be the detailed fluid formulation for specified viscosity and fluid stability requirements. Data cleaning and ingestion were done thoroughly to remove nonphysical outliers such as bob-climbing during testing. A detailed parametric correlation study followed and revealed the impact of different parameters, especially divalent ions such as Ca+2 and Mg+2, and total dissolved solids on the rheology. The training set to holdout set ratio was fixed at 90:10 for different trials. Further, 5-fold cross validation was used to choose the hyperparameters for the final model. To predict fluid formulation/target rheology in terms of additive concentrations, which is a continuous quantity, regression-based models were attempted. Ridge regression and ensemble methods such as random forest and boosting type models were trained. Boosting-based models gave an average 88% goodness of fit (R2) for the holdout datasets. For field implementation, the model results were used to create a digital laboratory request for the laboratory technician instead of having the fracturing design engineer manually handle this task. The physics-based data-driven ML model reduced an average HP/HT runs/well from 20 to 5 yielding a 400% laboratory resource savings. This ML-based workflow is unique and does not exist in the literature. It can enable resource optimization for all large-scale fracturing projects and reduce manual laborious input for generating laboratory requests followed by trial-and-error optimizations with a potential of saving thousands of hours and reduce all the laboratory equipment maintenance costs. The technique can easily be extended to designing cementing fluids, drilling muds, and corrosion properties.
APA, Harvard, Vancouver, ISO, and other styles
7

Iskandarov, Javad, George Fanourgakis, Waleed Alameri, George Froudakis, and Georgios Karanikolos. "Machine Learning Application to CO2 Foam Rheology." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208016-ms.

Full text
Abstract:
Abstract Conventional foam modelling techniques require tuning of too many parameters and long computational time in order to provide accurate predictions. Therefore, there is a need for alternative methodologies for the efficient and reliable prediction of the foams’ performance. Foams are susceptible to various operational conditions and reservoir parameters. This research aims to apply machine learning (ML) algorithms to experimental data in order to correlate important affecting parameters to foam rheology. In this way, optimum operational conditions for CO2 foam enhanced oil recovery (EOR) can be determined. In order to achieve that, five different ML algorithms were applied to experimental rheology data from various experimental studies. It was concluded that the Gradient Boosting (GB) algorithm could successfully fit the training data and give the most accurate predictions for unknown cases.
APA, Harvard, Vancouver, ISO, and other styles
8

Skauge, Tormod, Kenneth Sorbie, Ali Al-Sumaiti, Shehadeh Masalmeh, and Arne Skauge. "Polymer in-Situ Rheology in Carbonate Reservoirs." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207286-ms.

Full text
Abstract:
Abstract A large, untapped EOR potential may be extracted by extending polymer flooding to carbonate reservoirs. However, several challenges are encountered in carbonates due to generally more heterogeneous rock and lower permeability. In addition, high salinity may lead to high polymer retention. Here we show how in-situ viscosity varies with permeability and heterogeneity in carbonate rock from analysis of core flood results and combined with review of data available in literature. In-situ rheology experiments were performed on both carbonate outcrop and reservoir cores with a range in permeabilities. The polymer used was a high ATBS content polyacrylamide (SAV10) which tolerates high temperature and high salinity. Some cores were aged with crude oil to generate non-water-wet, reservoir representative wettability conditions. These results are compared to a compilation of literature data on in-situ rheology for predominantly synthetic polymers in various carbonate rock. A systematic approach was utilized to derive correlations for resistance factor, permeability reduction and in-situ viscosity as a function of rock and polymer properties. Polymer flooding is applied to improve sweep efficiency that may occur due to reservoir heterogeneities (large permeability contrasts, anisotropy, thief zones) or adverse mobility ratio (high mobility contrast oil-brine). In flooding design, the viscosity of the polymer solution in the reservoir, the in-situ viscosity, is an essential parameter as this is tuned to correct the mobility difference and to improve sweep. The viscosity is estimated from rheometer/viscometer measurements or, better, measured in laboratory core flood experiments. However, upscaling core flood experiments to field is challenging. Core flood experiments measure differential pressure, which is the basis for the resistance factor, RF, that describes the increased resistance to flow for polymer relative to brine. However, the pressure is also influenced by several other factors such as the permeability reduction caused by adsorption and retention of polymer in the rock, the tortuosity of the rock and the viscosity of the flowing polymer solution. Deduction of in-situ viscosity is straight forward using Darcy's law but the capillary bundle model that is the basis for applying this law fails for non-Newtonian fluids. This is particularly evident in carbonate rock. Interpretation of in-situ rheology experiments can therefore be misleading if the wrong assumptions are made. Polymer flooding in carbonate reservoirs has a large potential for increased utilization of petroleum reserves at a reduced CO2 footprint. In this paper we apply learnings from an extensive core flood program for a polymer flood project in the UAE and combine this with reported literature data to generate a basis for interpretation of in-situ rheology experiments in carbonates. Most importantly, we suggest a methodology to screen experiments and select data to be used as basis for modelling polymer flooding. This improves polymer flood design, optimize the polymer consumption, and thereby improve project economy and energy efficiency.
APA, Harvard, Vancouver, ISO, and other styles
9

St.Michel, Nathan, Jianhui James Xu, Jonathan Harrist, Guodong David Zhan, and Abdulwahab Aljohar. "Automated Fluid Rheology Measurement at the Drillsite." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211082-ms.

Full text
Abstract:
Abstract With the increase of automation and process control requirements, a good real-time grasp of the drilling fluid rheology has repeatedly been flagged as a key requirement. Unfortunately, drilling fluid rheology is still mostly measured manually and reported only twice a day. Fluctuations in fluid composition and rheology due to wellbore/fluid interaction and temperature/shear/solids effects are generally missed. This paper describes the field implementation and testing of an inline-design pipe rheometer that operates autonomously to continuously measure rheological properties of the drilling fluid in the rig's mud tanks. This data can be used to monitor the stability or indicate changes in these drilling fluids. The system employs a progressive cavity pump to draw drilling fluid from the mud tank and propel it, at varying controlled rates, through two different sizes of pipe. Differential pressure transducers are used to measure the pressure drop over a fixed length in each size of pipe, and this data, along with flow rate, is used to calculate fluid viscosity. All components are installed within a standard ISO shipping container for ease of transport and deployment at the wellsite. It is positioned next to the mud tanks where it continuously samples and measures the drilling fluid. Field test results of the system are presented. The system was operated autonomously on location in Saudi Arabia for an entire drill stage (3.5 days) of 5-7/8" section for gas drilling. In this section, oil based mud was used and measured by the system. The system was controlled remotely via WiFi connection. During the test period, manual viscosity and density measurements were also taken using the Fann-35 and mud balance methods. Subsequent comparison shows excellent agreement between the automated and manual measurements.
APA, Harvard, Vancouver, ISO, and other styles
10

Creasy, T. S., and S. G. Advani. "Rheology of Discontinuous Fiber Arrays in Elongation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0456.

Full text
Abstract:
Abstract This paper presents a two-fluid shear cell model that may apply to the long-discontinuous-fiber melt system made from AS4 carbon/poly-ether-ketone-ketone. As a 370°C melt at rest, PEKK forms a thermotropic liquid crystal structure. An LDFMS extended in the direction of the fibers generates a magnified local shearing strain rate through relative fiber motion. The boundary between the LCP and isotropic fluids could be a function of the fiber volume fraction, the generated shear strain rate, and the nucleation strength of the fiber surface. The two-cell model shows some of the consequences of generating a two fluid system within the LDFMS. The experimental data in this paper demonstrate the LCP character of PEKK and the nucleation effects of the AS4 fibers.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Rheology data"

1

KOOPMAN, DAVIDC. A Comparison of Rheology Data for Radioactive and Stimulant Savannah River Site Waste. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/825740.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

KOOPMAN, DAVIDC. A Summary of Rheology Data For SB3 and SB2/3 Blend Simulant Savannah River Site Wastes. Office of Scientific and Technical Information (OSTI), March 2004. http://dx.doi.org/10.2172/828298.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Singhvi, Punit, Javier García Mainieri, Hasan Ozer, and Brajendra Sharma. Rheology-Chemical Based Procedure to Evaluate Additives/Modifiers Used in Asphalt Binders for Performance Enhancements: Phase 2. Illinois Center for Transportation, June 2021. http://dx.doi.org/10.36501/0197-9191/21-020.

Full text
Abstract:
The increased use of softer binders in Illinois over the past decade is primarily attributed to the increased use of recycled materials in asphalt pavement construction. The shift in demand of using PG 58-28 over PG 64-22 has resulted in potential alternative methods to produce softer binders more economically using proprietary products. However, there are challenges in using these proprietary products for asphalt modification because of uncertainty in their long-term performance and significant variability in binder chemistry. The current SuperPave performance grading specification for asphalt binders is insufficient in differentiating binders produced from these modifiers. Therefore, the objective of this study is to evaluate the performance of various softener-type asphalt binder modifiers using a wide array of rheological and chemistry tests for their integration into the Illinois Department of Transportation’s material specifications. The small-strain rheological tests and their parameters allowed for consistent grouping of modified binders and can be used as surrogates to identify performing and nonperforming asphalt binders. A new parameter, Δ|G*|peak τ, was developed from the linear amplitude sweep test and showed potential to discriminate binders based on their large-strain behavior. Chemistry-based parameters were shown to track aging and formulation changes. The modifier sources were identified using fingerprint testing and were manifested in the modified binder chemical and compositional characteristics. The two sources of base binders blended with the modifiers governed the aging rate of the modified binders. Mixture performance testing using the Illinois Flexibility Index Test and the Hamburg Wheel-Track Test were consistent with the rheological and chemical findings, except for the glycol amine-based modified binder, which showed the worst cracking performance with the lowest flexibility index among the studied modifiers. This was contrary to its superior rheological performance, which may be attributed to lower thermal stability, resulting in high mass loss during mixing. According to the characterization of field-aged binders, laboratory aging of two pressurized aging vessel cycles or more may represent realistic field aging of 10 to 15 years at the pavement surface and is able to distinguish modified binders. Therefore, an extended aging method of two pressurized aging vessel cycles was recommended for modified binders. Two different testing suites were recommended for product approval protocol with preliminary thresholds for acceptable performance validated with field-aged data.
APA, Harvard, Vancouver, ISO, and other styles
4

Laboratory procedures and data reduction techniques to determine rheologic properties of mass flows. US Geological Survey, 1993. http://dx.doi.org/10.3133/wri934123.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Rheology data' for particular source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography