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Rozprawy doktorskie na temat „Shear thickening fluids”

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Data publikacji: 6 września 2023

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1

Sadrizadeh, Sasan. "Instabilities in Pulsating Pipe Flow of Shear-Thinning and Shear-Thickening Fluids." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-82037.

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In this study, we have considered the modal and non-modal stability of fluids with shear-dependent viscosity flowing in a rigid straight pipe. A second order finite-difference code is used for the simulation of pipe flow in the cylindrical coordinate system. The Carreau-Yasuda model where the rheological parameters vary in the range of 0.3 < n < 1.5 and 0.1 < λ < 100 is represents the viscosity of shear- thinning and shear thickening fluids. Variation of the periodic pulsatile forcing is obtained via the ratio Kω/Kο and set between 0.2 and 20. Zero and non-zero streamwise wavenumbe
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Zhu, Weijie Kelvin. "Numerical analysis of shear thickening fluids for blast mitigation applications." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10717.

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Improvised Explosive Devices (IEDs) have evolved over the years to become one of the main causes of casualties and fatalities in recent conflicts. One area of research focuses on the improvement of blast attenuation using Shear Thickening Fluid (STF). The STF is a dilatant material, which displays non-Newtonian characteristics in its unique ability to transit from a low viscosity fluid to a high viscosity fluid. Although empirical research and computational models using the non-Newtonian flow characteristics of STF have been conducted to study the effects of STF on blast mitigation, to the aut
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Tabassum, Maisha. "Mechanical and Energy-Absorbing Properties of Shear-Thickening Fluids (STFs)." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16856.

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The absorption of dynamic energy during impact of a material is ubiquitous in industrial, biomedical and military applications. From suspension systems to shock absorbers, the ability to divert or dissipate dynamic energy imposes many challenges in developing these systems. Some typical complex composite fluids, such as shear-thickening fluids (STFs), play a vital role in these challenges. STFs, classified as non-Newtonian fluids, are special fluidic composites of dense suspensions which dramatically change their viscosity when subjected to a change in shear rate or stress. These fluidic compo
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Shah, Ashish, and ashishshah7@yahoo co in. "Rheology of Shear Thickening Mineral Slurries." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080725.133946.

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Abstract In order to improve the optimisation of mineral processing operations the rheological properties of slurries must be determined as accurately as possible under the conditions that closely resemble actual site conditions. The rheology of particles suspended in Newtonian fluids is well documented. However, the rheology of particles in non-Newtonian fluids has not been the subject of much investigation till now. The work conducted here attempts to fill this gap in knowledge. The rheological properties of slurries are heavily dependent on the solids concentrations and particl
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Madraki, Fatemeh. "Shear Thickening in Non-Brownian Suspensions." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1584354185678102.

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Hasib, Mohammad Tarik. "Vibration Control of Sandwich Beams by Integration of Shear Thickening Fluid." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13520.

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A group of materials that have recently gained a lot of attention in research are shear thickening fluids (STF). A shear thickening fluid (STF) is a material whose viscosity increases significantly when the shear strain rate is at critical value. Most shear thickening fluids are designed by using a colloidal suspension of solid particles in a liquid matrix. This allows solidification of the fluid by congregation of the particles under stress. In this study the experimental findings are focused on assessing the mechanical property of shear thickening fluid (STF) after its transition to a solid
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Xu, Yue. "Stabbing resistance of soft ballistic body armour impregnated with shear thickening fluid." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/stabbing-resistance-of-soft-ballistic-body-armour-impregnated-with-shear-thickening-fluid(c5e8d517-6d46-4049-960c-383b10245800).html.

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Cui, Xiaoyu. "Drop-weight Impact Behaviour of a Shear Thickening Fluid in a Finite Volume." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25941.

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This thesis aims to study and explore the drop-weight impact-induced solidification process of an STF, consisting of 58 vol% styrene/acrylate particles in ethylene glycol, in a finite volume. The study begins with the characterisation of the mechanical behaviours (i.e., rheological and confined compression behaviours) of the STF. Low-velocity drop-weight impact experiments are conducted to investigate the effect of the STF’s dimensions in a finite volume on the impact behaviour of the STF. It is found that the impact behaviour is related to both the depth and the diameter of the STF. A new mo
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Ramirez, Jose G. (Jose Guadalupe) 1980. "Characterization of shear-thickening fluid-filled foam systems for use in energy absorption devices." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32777.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (leaf 44).<br>The absorption of energy during impacts is ubiquitous in society. From our car seats to body armor, the ability to divert or dissipate unwanted energy is an aspect that has many engineering challenges. One approach to this issue is the use of fluid-filled elastomeric foams. In the present thesis, the fluid within these foams is a non-Newtonian shear-thickening fluid composed of 300 nm silica particles suspended in a solvent, ethylene glycol, at high
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Cheng, Jialun. "Striker Shape Effect on Low-velocity Impact Energy Absorption of a Shear Thickening Fluid." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22694.

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This thesis aimed to systematically investigate striker shape effect on the mechanical behaviours and energy absorption capabilities of a shear thickening fluid (STF) under low-velocity impact tests. STF is a non-Newtonian colloidal suspension system with a preferable energy absorption capability under both low-velocity and high-velocity impact. This study’s STF consisted of 58.8 vol. % styrene/acrylate co-polymer particles in an ethylene glycol medium. First, rheology tests and scanning electron microscope tests were implemented to study the shear thickening behaviour and submicron-configura
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Mandal, Anirban. "Computational Modeling of Non-Newtonian Fluid Flow in Simplex Atomizer." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1202997834.

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12

Anderson, Brian. "Development of a non-Newtonian latching device." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3855.

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Liard, Maxime. "Suspension concentrées : systèmes non newtoniens et thixotropie sous écoulement." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE039/document.

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Cette thèse de doctorat a été financée par l’entreprise SIKA spécialisée dans les matériaux de construction. Les trois chapitres de cette thèse correspondent à la tentative de résolution de trois problématiques d’origine industrielle. Dans le premier chapitre, nous avons étudié l’effet de la concentration en particules sur les propriétés d’écoulement de fluides complexes rhéofluidifiants ou rhéoépaississants et démontré l’origine microscopique de cet effet. Dans le second chapitre, nous avons étudié la floculation de particules colloïdales sous faibles perturbations et mis en évidence l’existe
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14

Wone, Michel. "Rhéologie des suspensions non Browniennes concentrées : une étude numérique." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1070/document.

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Les suspensions de grains rigides dans un fluide constituent une classe de fluides complexes présentant une rhéologie riche. Même dans les cas simples où le fluide est Newtonien, et les grains sphériques, non Browniens et non colloïdaux, les comportements macroscopiques observés restent mal compris, en particulier dans le cas de suspensions concentrées. Dans ces matériaux, la complexité de la dynamique provient de l'équilibre subtil qui se met en place entre les interactions de nature hydrodynamiques portées par le fluide interstitiel et les forces de contact entre les grains. Dans ce travail,
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15

Landazuri, Gomez Gabriel. "Les études de la dynamique du système micellaire P103/Eau et système de rhéoépaississement CTA-n-Fluorobenzoato." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00955891.

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Cette thèse vise à comprendre l'effet des dynamiques des micelles de copolymères sur leurs propriétés rhéologiques. En effet les copolymères amphiphiles peuvent s'auto-assembler dans l'eau pour former diverses microstructures micellaires sphériques, cylindriques ou lamellaires. Leur dynamique est un paramètre crucial pour définir leur spectre d'applications, en particulier dans le transport de médicaments et dans la synthèse de matériaux méso-structurés. Les micelles se structurent en continu: elles peuvent se former et se dissocier en monomères, se fusionner ou se fragmenter. Nous avons dével
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16

Yan, Rui-Liang, and 顏瑞良. "Shear thickening fluids applied to the study of liquid armor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/80836172599145133408.

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碩士<br>國防大學中正理工學院<br>應用化學碩士班<br>99<br>Shear thickening fluid (STF) has found its applications in protective materials recently. Generally, the STF consists of colloidal silica particles, their average size being about 450nm, being dispersed in a liquid solvent. However, the particle size of the particles has tremendous influence on the rheological behavior of the suspension. Therefore, in this study, shear thickening behaviors of nano silica , submicron silica and carbon nanotubes dispersions in ethylene glycerol (EG) and polyethylene glycol (PEG) have been studied with rheometer. The dispersio
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17

Lin, Jhih-Jhang, and 林志璋. "Study of Impact Resistance of Composites Containing Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3vfnxc.

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碩士<br>國立臺北科技大學<br>化學工程研究所<br>101<br>In this study, shear thickening fluid was prepared by two methods. Polyethylene glycol was used as the fluid and silicon dioxide nanoparticles of two different sizes were used as the colloid. From the results, we observed that the mixtures of high loading level of silica nanoparticles with polyethylene glycol demonstrated significant shear thickening behavior. For the PEG fluid containing 40 wt% 15 nm silicon dioxide nanoparticles, the viscosity of fluid instantly increased 29 to 30 times when shear rate increased from 5/s to 28.9/s. Also, for the PEG fluid
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18

Chen, Yao-Chun, and 陳堯鈞. "Preparation and Properties of multi-layer Kevlar / Shear Thickening Fluid Composites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/n9543p.

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碩士<br>國立臺灣科技大學<br>材料科學與工程系<br>104<br>This study reports a “scale up process” of shear thickening fluid (STF). The 40 wt% STF / Kevlar composite was manufactured by two different process. One is impregnating Kevlar fabrics with STF. The other method uses “mangle machine” padding the STF into Kevlar fabrics. The air gun impact test result of the impregnating method showed that STF impregnating with 2 layers Kevlar K129 can significantly increase EDP by 31%. The air gun impact test results of the “mangle machine” method prepared composite is similar with the sample prepared by the impregnating me
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Shen, Ching, and 沈情. "Synthesis of Core-Shell Nanoparticles and Its Application as Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/fz42aa.

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碩士<br>國立臺北科技大學<br>化學工程研究所<br>102<br>Shear thickening fluid, a type of non-Newtonian fluid, changes viscosity based on shear rate. It has low viscosity at low shear rates, and high viscosity at high shear rates. Thus, this fluid stays mobile under normal conditions, but swiftly hardens upon high-speed impact, resulting in a material useful in liquid armor. So far, most studies have focused on silica-based material as the primary particles in shear thickening fluids, but they often show limited resistance to puncturing. Herein, an approach to synthesize core-shell (alumina/silica) nanoparticles,
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CHEN, YING-JU, and 陳盈儒. "Research of the Protective Materials Containing Shear- thickening-fluid with Graphene Composites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/95389444518702825488.

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碩士<br>國防大學理工學院<br>化學工程碩士班<br>104<br>Shear thickening fluid (STF) is a colloidal suspension of solid particles suspended in fluid and exhibits the shear thickening phenomenon resulting in large, sometimes discontinuous increase in viscosity above a critical shear rate. This particular rheological property of STFs can be utilized to improve their impact resistance and can be used in many protective applications. However, the impact resistance and threats including puncture, stab and 9 mm bullet impacts (muzzle velocity of 350 ± 10 m/s) varies from the low velocity range to high velocity range. T
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Chien, Shih-Shun, and 簡士勛. "Synthesis of Alumina and Core-Shell Nanoparticles and Their Application as Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/08424170518396013973.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>101<br>Abstract Shear thickening fluid, so called STF, which has a special rheological behavior of the fluid. When suddenly exposed to external shocks, it rapidly presented like a solid which has hardness of properties in a short time (about a few milliseconds). Army Research Laboratory (ARL) first developed shear thickening fluid for military. They researched based on the Kevlar fibers, which was immersed the shear thickening fluid which consists silica nanoparticles and polyethylene glycol mixing, and they called it liquid armor. This shear thickening fluid can gr
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Lanzendörfer, Martin. "Proudění nestlačitelných tekutin s viskozitou závislou na tlaku (a jejich aplikace při modelování proudění v ložisku)." Doctoral thesis, 2011. http://www.nusl.cz/ntk/nusl-311374.

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Title: Flows of incompressible fluids with pressure-dependent viscosity (and their application to modelling the flow in journal bearing) Author: Martin Lanzendörfer Department: Mathematical Institute of Charles University Supervisor: prof. RNDr. Josef Málek, DSc. Abstract: The viscosity of the fluids involved in hydrodynamic lubrication typically depends on pressure and shear rate. The thesis is concerned with steady isothermal flows of such fluds. Generalizing the recent results achieved in the case of homogeneous Dirichlet boundary conditions, the existence and uniqueness of weak solutions s
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Rabb, Robert James 1966. "A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar." Thesis, 2007. http://hdl.handle.net/2152/3268.

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Advanced impact protection systems can experience serious damage due to contact with projectiles such as fragments or entire fan blades. To prevent catastrophic damage of such systems will require sophisticated materials and complex designs. The development of advanced ballistic protection systems will place increased emphasis on the use of composite materials and on numerical simulations to assess these new systems due to the cost and limitations of testing facilities and the increased capability of computing power. Example applications include the design of body armor for the protection of p
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ZHENG, MING ZHE, and 鄭明哲. "The Study on Anti-stab Property of Fabric with Kevlar/Shear Thickening Fluid/ Graphene Oxide." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/222q6m.

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碩士<br>逢甲大學<br>纖維與複合材料學系<br>105<br>In order to reduce the number of layers of Kevlar fabric effectively and to improve the mobility of personnel, we used colloidal silica dispersed in polyethylene glycol to prepare shear thickening fluid that was used in protective armor with effective protective properties. The addition of graphene oxide was discussed in this paper to investigate its impact on the effect of shear fluid properties. In this study, we investigated the puncture test, falling weight impact test, rheological test and torsion test of colloidal silica in different molecular weight of
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Rabb, Robert James. "A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar /." 2007. http://www.lib.utexas.edu/etd/d/2007/rabbr70962/rabbr70962.pdf#page=3.

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