Dissertations / Theses: 'Electrorheological fluids'

1

Seed, M. "Electrorheological fluids." Thesis, University of Sheffield, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321479.

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2

Watson, T. "Electrorheological fluids." Thesis, Cranfield University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334815.

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3

Huang, Xianxiang. "Theoretical study of electrorheological fluids /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20HUANG.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 108-115). Also available in electronic version. Access restricted to campus users.

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4

Wu, Xin Ming. "Electrorheological fluids : fundamentals and engineering applications." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316617.

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5

Stevens, N. G. "Electrorheological fluids and their engineering application." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356283.

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6

Markham, Gavin Michael. "A study of model electrorheological fluids." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361181.

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7

Rhyou, Chanryeol 1973. "Finite element simulation of electrorheological fluids." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28941.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005.
Includes bibliographical references (p. 85-88).
Electrorheological (ER) fluids change their flow properties dramatically when an electric field is applied. These fluids are usually composed of dispersions of polarizable particles in an insulating base fluid or composed of liquid crystal polymer. To build more suitable and complicated designs for application of ER fluid, the simulation of ER fluid as well as experiments are important. First, fundamental fluid motions of Newtonian fluids are simulated and checked by comparing them with mathematical calculation. Second, among many models of ER fluid, the Bingham plastic fluid was chosen to represent the ER fluidic behavior in case of the heterogeneous ER fluid. Also, shear stress-strain rate relation of ER fluid was simulated in case of shear modes and pressure modes in both fluids; heterogeneous and homogeneous fluid. Also, the simulated shear strain-stress relationship was compared with experimental results.
by Chanryeol Rhyou.
S.M.

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8

Diening, Lars. "Theoretical and numerical results for electrorheological fluids." [S.l. : s.n.], 2002. http://www.freidok.uni-freiburg.de/volltexte/458.

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9

Faghmous, Ali. "On the mechanical properties of electrorheological fluids." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316622.

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10

黃俊祺 and Chun-kay Edward Wong. "Electrorheological fluid interfaces in mechatronic devices." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31237848.

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11

Wong, Chun-kay Edward. "Electrorheological fluid interfaces in mechatronic devices /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1965733X.

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12

Kelly, J. P. "An investigation into the properties of electrorheological fluids." Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278761.

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13

Rashid, Abu S. "Compressible magnetorheological fluids." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1456488.

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14

Vallabh, Priya. "Electrorheological brake for haptic interface systems." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17070.

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15

Zade, Vishal B. "Rolling Resistance of Electrorheological Composites." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1435856708.

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16

Acevedo, Aldo. "Electrorheology of concentrated nematic solutions of rodlike polymers molecular weight and polydispersity dependence /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 4.32 Mb., p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3220637.

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17

Mäkelä, Kimmo K. "Characterization and performance of electrorheological fluids based on pine oils /." Espoo, Finland : University of Oulu, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P385.pdf.

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18

Rattray, P. "Pulsed flow and time-resolved dielectric spectroscopy of electrorheological fluids." Thesis, Cranfield University, 1994. http://dspace.lib.cranfield.ac.uk/handle/1826/10508.

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Research has been undertaken into the dielectric and rheological properties of electrorheological (ER) fluids. The fluids studied were based on acene-quinone radical polymers made within the department dispersed in silicone oil. A commercial poly(1ithium methacrylate) dispersion was also examined. As a means of probing the underlying mechanisms of the E phenomenon, the permittivity of the fluids was measured from 12 Hz to 100 kHz under both static and dynamic conditions. Results indicated that a interfacial polarization process was taking place. A series of visual observations were made of fluids under different fielding patterns. A series of photographs were taken that illustrated the structure formation with elapsed time in a dilute fluid. Also photographs were taken of the final structure formed under different field conditions. .. To perform permittivity measurements of the fluid when a electric field was applied, a high voltage biasing unit was designed, built and proved. This allowed the application of a continuous DC electric field of up to 3 kVmm" and the permittivity to be measured from 150 H t 100 kl-Iz. Through a series of experiments it was found that the low frequency permittivity increased with increasing electric field. This result was partially explained by the Sillars model. The fluids were also subjected to shear rates from 1500 to 60 s". Flow modified permittivity resonances were found at the predicted frequencies. However, the resonant frequency did not move significantly under the application of a electric field. The structuring process was time resolved and a model was made to predict the sealing of the characteristic structuring time. The rheological response of the fluids when subjected t pulsed DC fields was examined and found to be dominated by a instrumentational effect. Al experimental procedures are given along with a comprehensive examination of the equipment. The results are discussed as they occur in terms of the models appropriate to that particular event.

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19

Liang, Youzhi Ph D. Massachusetts Institute of Technology. "Design and optimization of micropumps using electrorheological and magnetorheological fluids." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101479.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 71-75).
Micropumps have rapidly expanded microhydraulic systems into a wider range of applications, such as drug delivery, chemical analysis and biological sensing. Empirical research has shown that micropumps suffer most from their extremely low efficiency. To improve the efficiency of micropumps, we propose to employ electrorheological (ER) and magnetorheological (MR) fluids as the hydraulic fluids. This thesis presents two methods: one is a dynamic sealing method to be applied on current micro-scale gear pumps using MR fluids, and the other is a novel design method of micropumps using ER fluids. Using MR fluid with applied magnetic field as a substitute for industrial hydraulic fluids, magnetic chains are aligned within the channel. The parameters, such as magnetic field, viscosity and volume fraction of MR fluid can be balanced to provide optimal sealing performance. Darcy flow through porous media and Bingham flow in a curved channel with a rectangular cross section have been used to model the MR fluid flow exposed to certain magnetic field intensity. Static and dynamic magnetic sealing performance is investigated theoretically and experimentally, which is evaluated by Mason numbers and friction factor. To achieve a higher efficiency and faster dynamic response, a novel design for micropumps driven by ER fluid is demonstrated. Moving mechanical parts are eliminated by applying a periodic voltage gradient. The approach involves exerting electric forces on particles distributed within the fluid and exploiting drag or entrainment forces to drive flow. Variables are explored, such as the dimension and layout of the channel and electrodes. Experiments are also designed to observe the performance of the solid state pump. In addition, a method of characterizing the efficiency of chamber pump is introduced and applied on screw-chamber pump and solenoid-chamber pump with check valve and ER valve.
by Youzhi Liang.
S.M.

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20

Powell, John Anthony. "Electrorheological fluids and other nonlinearities in shock and vibration isolation." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU046769.

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This thesis investigated the use of electrorheological fluids in shock and vibration isolation. An electrorheological fluid (ER) is a suspension of semiconducting particles in a nonconducting carrier fluid. The novel feature of this fluid is its ability to change its rheological properties upon the application of an external electric field. To investigate the properties of activated ER fluids an experimental oscillatory electroviscometer was commissioned and the fluid tested. Conclusions drawn from the results were that the activated ER fluid changed from a viscous system, to one with a yield stress, elasticity and enhanced viscosity. These rheological changes were catalogued for a variety of electric field strengths, oscillatory frequencies and amplitudes. The fluid was also incorporated into a damper in an experimental single degree of freedom base excited system (SDOF). It was shown that the relative displacement between the base and the isolated mass could be significantly reduced on application of an electric field. The feasibility of a 'switched' semi-active vibration isolation scheme was also demonstrated with the SDOF apparatus. This system aimed to reduce isolated mass acceleration. Numerical analysis was carried out which involved successfully modelling the response of the SDOF system incorporating the ER damper. This model used a 'softening' spring element, a 'nonreversible' Coulomb friction characteristic and viscous damping to represent ER material behaviour. A theoretical comparison was also made between activated ER systems and systems with hardening spring characteristics, for steady state and transient responses. It was shown theoretically that the semi-active scheme described can give major improvements in isolation performance for frequencies much greater than resonance. The numerical integration of the models was carried out using a fourth order Runge-Kutta algorithm with the aid of a novel smoothing function to overcome problems associated with modelling friction phenomena.

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21

Sinha, Kaustav. "Particle engineering for the formulation of smart functional fluids : novel synthesis, processing and comparative analysis of magnetic nanoparticles and fluids /." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3342619.

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Thesis (Ph. D.)--University of Nevada, Reno, 2008.
"December 2008." Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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22

Kavlicoglu, Barkan M. "A new unified theory for flow analysis of a magneto-rheological (MR) fluids and application of MR fluids in a high-torque clutch." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3239876.

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23

Hu, Ben. "Nano-structured and surface polymerized magnetorheological fluid /." abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/3209226.

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Thesis (Ph. D.)--University of Nevada, Reno, 2005.
"December 2005." Includes bibliographical references (leaves 155-166). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm.

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24

Davies, Jayne Louise. "Electrorheological fluids as smart medicines with potential in controllable drug delivery." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301535.

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25

York, David J. "A novel magnetorheological fluid-elastomer vibration isolator /." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1448335.

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Thesis (M.S.)--University of Nevada, Reno, 2007.
"August, 2007." Includes bibliographical references (leaves 83-86). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2007]. 1 microfilm reel ; 35 mm.

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26

Ozcan, Sinan. "Simulation of field controllable fluids with suspended ferrous particles in micro tubes." abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1433348.

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27

Whiteley, Joseph L. "Study of magneto-rheological fluid flow in microchannels /." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1448022.

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Thesis (M.S.)--University of Nevada, Reno, 2007.
"May, 2007." Includes bibliographical references (leaves 73-77). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2007]. 1 microfilm reel ; 35 mm.

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28

Gong, Xiuqing. "PDMS based microfluidic chips and their application in material synthesis /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?NSNT%202009%20GONG.

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29

Sahin, Huseyin. "Theoretical and experimental studies of magnetorheological (MR) fluids and MR greases/gels from rheology to system application /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3339143.

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30

Bangrakulur, Krishna Kiran. "A seismic magneto-rheological (MR) fluid by-pass damper." abstract and full text PDF (UNR users only), 2004. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1423856.

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31

Thomas, Louis Ignatius Jr. "Semi-active vibration control by means of an electrorheological fluids : from robust to fuzzy control." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17252.

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32

Bortolotto, Christopher M. (Christopher Michael) Carleton University Dissertation Engineering Mechanical and Aerospace. "The rheological properties of electrorheological fluids and their application to controllable dampers for ground vehicles." Ottawa, 1995.

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33

Cox, Barry James. "Mathematical modelling of nano-scaled structures, devices and materials." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20080129.102240/index.html.

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34

Akaiwa, Michiro. "The electrorheological effect in static squeeze-flow." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367103.

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35

Mui, Glen B. Carleton University Dissertation Engineering Mechanical and Aerospace. "Parameter identification of a non-linear electrorheological fluid damper model." Ottawa, 1996.

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36

Mazursky, Alex James. "Application of Electrorheological Fluid for Conveying Realistic Haptic Feedback in Touch Interfaces." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1556817760104138.

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37

Chen, Shuwen. "A preliminary discourse on tunable rolling resistance of electrorheological fluid containing polymer composites." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1446586803.

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38

Sturk, Murray Alan Carleton University Dissertation Engineering Mechanical. "Development and evaluation of a high voltage supply unit for electrorheological fluid dampers." Ottawa, 1993.

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39

Kim, Kwangmoo. "Topics in the theory of inhomogeneous media composite superconductors and dielectrics /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180537980.

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40

Reed, Matthew Robert. "Development of an Improved Dissipative Passive Haptic Display." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5284.

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This project focuses on the design and modeling of a two degree-of-freedom dissipative passive haptic display. Haptic displays are man-machine interfaces that transmit forces to the human operator. A dissipative passive haptic display is one that may only remove energy from the system using actuators such as brakes and dampers, thus ensuring the safety of the human operator. These devices may be used to implement virtual constraints such as desired paths and obstacles. Traditional friction brakes have previously been used as dissipative and coupling elements in a two degree-of-freedom parallel manipulator, resulting in undesired effects such as vibration, stiction, and slow response times. Alternatively, the new robot is actuated by rheological brakes, which feature fast response times and smooth application of torque. This approach aims to improve upon the accuracy and feel of the previous design. A commercial magnetorheological (MR) fluid brake was selected and put through an extensive series of tests. The data was used to develop a model that characterizes MR fluid behavior in low speed braking applications. A parallel five bar linkage was designed and built that has separate configurations corresponding to 3-brake and 4-brake operation. The length of each arm was chosen by means of a geometrical optimization that weighs the size and area of the workspace and actuator effects. A simulation was then developed by incorporating the brake model into the equations of motion of the robot. Next, two forms of path following velocity control were devised and tested in simulation. Finally, the accuracy, workload, and smoothness of both controllers and both configurations were examined in preliminary tests with human operators.

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41

"Dynamic electrorheological effects of rotating spheres." 2005. http://library.cuhk.edu.hk/record=b5892658.

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Shen Lei = 旋转颗粒的动态电流变效应 / 沈雷.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.
Includes bibliographical references (leaves 68-72).
Text in English; abstracts in English and Chinese.
Shen Lei = Xuan zhuan ke li de dong tai dian liu bian xiao ying / Shen Lei.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- ER fluids and dynamic ER effects --- p.1
Chapter 1.2 --- Negative ER effects and Quincke Rotations --- p.3
Chapter 1.3 --- Recent works on ER fluids --- p.5
Chapter 1.4 --- Objectives of the thesis --- p.8
Chapter 2 --- Dynamic ER effects of two-body systems --- p.10
Chapter 2.1 --- Formalism under the point-dipole approximation --- p.10
Chapter 2.2 --- Numerical results under the point-dipole approximation --- p.20
Chapter 2.3 --- Discussions under the MID approximation --- p.25
Chapter 2.4 --- Conclusion --- p.28
Chapter 3 --- Dynamic ER effects of periodic boundary systems --- p.30
Chapter 3.1 --- Ewald-Kornfeld formulation --- p.31
Chapter 3.2 --- Structure transformation in ER solids induced by particle rota- tions --- p.36
Chapter 3.3 --- Structure transformation in ER solids induced by field rotations --- p.42
Chapter 3.4 --- Discussion and conclusion --- p.45
Chapter 4 --- Dynamic ER effects of Quincke rotations --- p.48
Chapter 4.1 --- Formalism --- p.49
Chapter 4.2 --- Molecular dynamics simulations --- p.51
Chapter 4.3 --- Numerical results --- p.54
Chapter 4.4 --- Self assembly of Quincke rotors --- p.61
Chapter 4.5 --- Discussion and conclusion --- p.62
Chapter 5 --- Summary --- p.65
Bibliography --- p.68
Chapter A --- Derivation of the multiple image expression --- p.73
Chapter A.1 --- Images of a point charge --- p.73
Chapter A.2 --- Images of a point dipole --- p.74
Chapter A.3 --- Images of a pair of spheres --- p.76
Chapter B --- Optimizations of the Ewald summation --- p.81

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42

Liu, Yen Yee, and 劉元宇. "Simulation and Optical Properties Measurement of Electrorheological Fluids." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/79863505455654089743.

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43

"Physics of field-responsive fluids: 場致反應液體的物理理論." 2001. http://library.cuhk.edu.hk/record=b6073323.

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Wan Tsz Kai, Jones.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2001.
Includes bibliographical references (p. [91]-95).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
Wan Tsz Kai, Jones.

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44

"study of electrorheological fluid by using the dipolar model =: 利用電偶模型對電變流流體作分析." 1998. http://library.cuhk.edu.hk/record=b5889591.

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Wan Tsz Kai, Jones.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1998.
Includes bibliographical references (leaves [81]-83).
Text in English; abstract also in Chinese.
Wan Tsz Kai, Jones.
Abstract --- p.i
Acknowledgement --- p.iii
Contents --- p.iv
List of Figures --- p.vii
List of Tables --- p.xii
Chapter Chapter 1. --- Introduction --- p.1
Chapter 1.1 --- What is an electrorheological fluid? --- p.1
Chapter 1.2 --- Overview of recent works on ER fluids by using the dipolar model --- p.2
Chapter 1.3 --- Objectives of the thesis --- p.3
Chapter Chapter 2. --- Justification of the dipolar model --- p.6
Chapter 2.1 --- Derivation of the dipolar factor --- p.6
Chapter 2.2 --- Modification of the dipolar factor for a pair of polarized spheres --- p.7
Chapter 2.2.1 --- Image charge for a conducting sphere --- p.8
Chapter 2.2.2 --- Difference equation for a pair of equal spheres: point charge consideration --- p.10
Chapter 2.2.3 --- Induced image dipoles for a pair of conducting spheres --- p.13
Chapter 2.3 --- Force and energy between a pair of polarized spheres --- p.16
Chapter 2.3.1 --- Calculation of multipole force by the thermodynamic approach --- p.17
Chapter 2.3.2 --- Calculation of multipole force by the energy consideration --- p.18
Chapter 2.3.3 --- Comparison of the multipole force with the force between two point dipoles --- p.19
Chapter 2.3.4 --- Results and Discussion --- p.22
Chapter Chapter 3. --- Dielectric response of ER fluids --- p.26
Chapter 3.1 --- Effective dielectric response of two-component systems: Maxwell- Garnett theory --- p.27
Chapter 3.1.1 --- Formalism and the dilute limit --- p.27
Chapter 3.1.2 --- Maxwell-Garnett approximation --- p.29
Chapter 3.2 --- Effective dielectric response of three-component systems: spectral representation --- p.31
Chapter 3.2.1 --- Generalized Maxwell-Garnett approximation --- p.31
Chapter 3.2.2 --- Spectral representation of three-component systems --- p.33
Chapter 3.3 --- "Effective dielectric response of three-component systems: dielectric core coated with, a liquid water shell embedded in a host medium" --- p.37
Chapter 3.3.1 --- Poles and Residues --- p.37
Chapter 3.3.2 --- Contribution of the resonant terms --- p.39
Chapter 3.3.3 --- Contribution of the non-resonant term --- p.43
Chapter 3.4 --- Effective dielectric response of three-component systems: dielectric core coated with a metallic shell embedded in a host medium --- p.45
Chapter 3.5 --- Effective dielectric response of three-component systems: Metallic core coated with a dielectric shell embedded in a host medium --- p.47
Chapter 3.6 --- Conclusion --- p.49
Chapter Chapter 4. --- System of distributed shell thickness --- p.51
Chapter 4.1 --- Numerical solution of the spectral density of constant shell thickness --- p.51
Chapter 4.2 --- Spectral density of distributed shell thickness --- p.53
Chapter Chapter 5. --- Anisotropic three-component systems --- p.60
Chapter 5.1 --- Generalized Maxwell-Garnett approximation for anisotropic structure --- p.60
Chapter 5.2 --- Anisotropic Maxwell-Garnett formula --- p.63
Chapter 5.3 --- Spectral representation for anisotropic microstructures --- p.65
Appendix A. Potential energy function and dipolar factor TO --- p.70
Appendix B. Ground state structure of an ER fluid --- p.72
Chapter B.1 --- Structure formation due to dipole interaction --- p.72
Chapter B.2 --- Dipole energy for other lattice structures --- p.75
Appendix C. Yield stress and shear modulus --- p.78
Bibliography --- p.81

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45

"Effects of structure and dynamics on the macroscopic physical properties of composite media." 2002. http://library.cuhk.edu.hk/record=b5891290.

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Lo Chi-keung.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.
Includes bibliographical references (leaves 69-72).
Abstracts in English and Chinese.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- What is an electrorheological fluid? --- p.1
Chapter 1.2 --- Overview of recent theoretical studies on ER fluids --- p.2
Chapter 1.3 --- Objectives of the thesis --- p.4
Chapter 2 --- Review of some established macroscopic concepts --- p.8
Chapter 2.1 --- Local field and depolarization tensor --- p.8
Chapter 2.2 --- Clausius-Mossotti equation --- p.10
Chapter 3 --- Ewald-Kornfeld formulation and effects of geometric anisotropy on local field distribution --- p.12
Chapter 3.1 --- The development of the Ewald-Kornfeld method --- p.12
Chapter 3.2 --- General Ewald-Kornfeld Formalism - point dipole approximation --- p.13
Chapter 3.3 --- Ewald-Kornfeld Formalism - tetragonal lattice of point dipoles --- p.14
Chapter 3.4 --- Numerical Results --- p.16
Chapter 3.5 --- Contact with macroscopic concepts --- p.18
Chapter 3.5.1 --- Generalized Clausius-Mossotti equation --- p.18
Chapter 3.5.2 --- Onsager reaction field --- p.19
Chapter 3.6 --- Figures --- p.22
Chapter 4 --- Field-induced structure transformation in ER solid --- p.24
Chapter 4.1 --- Ewald-Kornfeld Formalism - body-centered tetragonal lattice --- p.25
Chapter 4.2 --- Effects of structure transformation on the local field --- p.27
Chapter 4.3 --- Structure transformation via rotating electric fields --- p.28
Chapter 4.4 --- Competitions between FCC and HCP --- p.30
Chapter 4.5 --- Figures --- p.31
Chapter 5 --- Geometric anisotropy from distortive lattices: ferrodistortive and antidistortive systems --- p.34
Chapter 5.1 --- Ferrodistortive lattice --- p.35
Chapter 5.1.1 --- Sublattice interaction tensors --- p.36
Chapter 5.1.2 --- Effective polarizability and Clausius-Mossotti equation --- p.37
Chapter 5.2 --- Antidistortive lattice --- p.39
Chapter 5.2.1 --- Sublattice interaction tensors --- p.40
Chapter 5.2.2 --- Sublattice dipole moments --- p.41
Chapter 5.2.3 --- Effective polarizability and polarization catastrophe --- p.43
Chapter 5.2.4 --- Depolarization field --- p.44
Chapter 5.3 --- Experimental realization - colloidal self-assembly --- p.45
Chapter 5.4 --- Figures --- p.46
Chapter 6 --- Discussion and conclusion --- p.52
Chapter 6.1 --- Discussion on our work and possible future extension --- p.52
Chapter 6.2 --- Conclusion --- p.54
Chapter A --- Piezoelectric coefficients by Ewald-Kornfeld formulation --- p.57
Chapter B --- Alternative formulation for Ewald-Kornfeld formulation by di- rect calculations of the dipole interaction tensor --- p.59
Chapter C --- Ewald-multipole formulation --- p.63
Chapter C.1 --- Multipole fields --- p.64
Chapter C.2 --- Coupled dipole-quadrupole lattice --- p.66
Bibliography --- p.69

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46

HSIN, LIU SHENG, and 劉昇鑫. "Study on Microscopic Structure and Shear Characteristics of Electrorheological Fluids." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/44490220281379790265.

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碩士
國立成功大學
機械工程學系
88
The electrorheological (ER) fluid is a medium that consists of fine suspended dielectric particles of sizes in micrometers mixed in a solvent of low dielectric permitivity. An ER fluid possesses the macroscopic property of high viscosity in the presence of an external applied electric field. The rheological properties of the ER fluid can be controlled by the external electric field, and thus the fluid is generally referred to as one of the smart fluids. Since the dynamic response of the electrorheological fluid is so fast that it is very difficult to characterize the associated behavior by any exiting macroscopic dynamic model and experiment. The employment of microscopic molecular dynamic models to evaluate the rheological properties of particles in the presence of external electric fields is thus of great importance. In order to come up with an effective tool for the design of devices using ER fluids, this thesis is geared toward the establishment of a systemic procedure for the selection and for the accurate dynamic characterization of the ER fluids. An electrostatic aggregative structure model for polarizable particles is first presented. The interaction forces among particles in forming percolating structures are derived using electric polarization principles. Based upon the derived model, the governing dynamic equations for particles in an electrorheological flow is also formulated. A computerized molecular dynamics simulation package is developed and used to simulate the particle dynamics in an ER flow. Good agreement between the computed solutions and existing data obtained from the literature indicates that the theory and the modeling procedure that are presented in this paper is theoretically sound and practically applicable for the analysis of various in ER fluids. They can be used to compute the average distance with a designated response characteristics. The electrorheological materials with suitable dielectric constant can be selected using the analysis results. Based upon the estimated dielectric strength of particles many important fluid characters including critical current density, and critical electric field for various ER fluids can be appropriately modeled and then used to control the behavior of ER fluids.

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47

Ursescu, Ana. "Channel flow of electrorheological fluids under an inhomogeneous electric field." Phd thesis, 2005. https://tuprints.ulb.tu-darmstadt.de/556/1/Dissertation_Ana_Ursescu.pdf.

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This thesis is a theoretical study of the steady pressure driven channel flow of electrorheological fluids (ERF) under a space dependent electric field generated by finite electrodes. Chapter 1 consists in a general description of ERF and their engineering applications and presents also the motivation, the goal and the borders of this work. Chapter 2 summarizes the governing equations of electrorheology with the corresponding jump conditions. It is assumed that the flow does not affect the electric field and consequently, the electrical problem is decoupled from the mechanical one. Both electrical and mechanical boundary value problems are formulated for various configurations of finite electrodes with different potentials placed along the channel walls. The simple case of two infinite electrodes which generate a homogeneous electric field is solved analytically. In Chapter 3 analytical solutions for different mixed boundary value problems arising from the electrical problem formulated in Chapter 2 are found by use of the Wiener-Hopf method. The solutions are given in terms of infinite series involving Gamma functions. The results can be used to describe the electric field generated between two infinite grounded electrodes by either one long electrode or two long electrodes charged in an anti-symmetric or a non-symmetric way. The electric field in the vicinity of the electrode edges is asymptotically evaluated. Some parametric studies are made with respect to the ratio between the permittivity of the electrorheological fluid and the permittivity of the isolating material outside the channel. We compare the analytical with numerical solutions and find good agreement which is considered as a validation of the numerical method. Chapter 4 treats the mechanical problem in more detail. First a review of the constitutive models used to describe the ER-fluids in the literature is given. Then two-dimensional alternative constitutive laws appropriate for numerical simulations originating from the Casson-like and power law models are introduced using a parameter. In the end we non-dimensionalize the problem in both cases. In the last Chapter, we simulate numerically the flow of the Rheobay TP AI 3565 ER-fluid using the alternative Casson-like model and the EPS 3301 ER-fluid using the alternative power-law model by applying a finite element program. The behaviour of different fields such as velocity, pressure, generalized viscosity and the second invariant of the strain rate tensor near the electrode edges is studied for both fluids. A comparison with the experimental data is performed, validating the simulations. In order to investigate how the numerical solution depends on the constitutive model we perform a parallel analysis of the two rheological models by applying them to the same material (Rheobay). Then we optimize the configuration of the electrodes by using the inhomogeneities caused by the end effects of the electrodes in order to obtain an enhancement of the ER-effect.

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48

"Study of interparticle force in ER fluids =: 電變流體中粒子相互作用力之硏究." 2001. http://library.cuhk.edu.hk/record=b5890738.

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Siu Yuet Lun.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2001.
Includes bibliographical references (leaves [51]-54).
Text in English; abstracts in English and Chinese.
Siu Yuet Lun.
Abstract --- p.i
Acknowledgments --- p.ii
Contents --- p.iii
List of Figures --- p.v
List of Tables --- p.vii
Chapter Chapter 1. --- Introduction --- p.1
Chapter 1.1 --- What is an electrorheological fluid? --- p.1
Chapter 1.2 --- Overview of recent theoretical studies of ER fluids --- p.2
Chapter 1.3 --- Objectives of the thesis --- p.3
Chapter Chapter 2. --- Justification of the DID model --- p.5
Chapter 2.1 --- Review of the multiple image method --- p.6
Chapter 2.1.1 --- The development of the multiple image method --- p.6
Chapter 2.1.2 --- Image dipole --- p.7
Chapter 2.1.3 --- Total dipole moment --- p.8
Chapter 2.2 --- Comparison of the multiple image method with the Klingenberg's force functions --- p.11
Chapter 2.3 --- Interparticle force in polydisperse ER fluids --- p.16
Chapter Chapter 3. --- Computer simulations of ER fluids in the DID model --- p.22
Chapter 3.1 --- The natural scales in the simulation --- p.23
Chapter 3.2 --- The aggregation for a pair of spheres --- p.25
Chapter 3.2.1 --- In uniaxial field --- p.25
Chapter 3.2.2 --- In rotating field --- p.28
Chapter 3.3 --- The aggregation for three and four spheres in the rotating field --- p.31
Chapter Chapter 4. --- Computer simulation of morphology in the DID model --- p.35
Chapter 4.1 --- Hard-core repulsion --- p.35
Chapter 4.2 --- Periodic boundary conditions --- p.36
Chapter 4.3 --- Morphology in DID model and PD model --- p.38
Chapter Chapter 5. --- Conclusion --- p.43
Chapter Appendix A. --- Analytic results of the equation of motion --- p.44
Chapter A.1 --- Analytic solution for two spheres --- p.45
Chapter A.2 --- Analytic solution for three spheres in a chain --- p.45
Chapter A.3 --- Analytic solution for three spheres in an equilateral triangle --- p.47
Chapter A.4 --- Analytic solution for four spheres in a square --- p.48
Chapter Appendix B. --- Table of values of the time steps --- p.50
Bibliography --- p.51

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49

Diening, Lars [Verfasser]. "Theoretical and numerical results for electrorheological fluids / vorgelegt von Lars Diening." 2002. http://d-nb.info/964878348/34.

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50

"A feasibility study of magneto-rheological fluids for micro devices." 1999. http://library.cuhk.edu.hk/record=b5890052.

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Ho Chi-hong.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1999.
Includes bibliographical references (leaves 50-51).
Abstracts in English and Chinese.
Chapter CHAPTER ONE: --- INTRODUCTION --- p.1
Introduction --- p.1
Motivation of the Problem --- p.1
Organization of this Thesis --- p.2
Chapter CHAPTER TWO: --- LITERATURE SURVEY --- p.3
Introduction --- p.3
Electrorheological Fluid --- p.3
Magnetorheological Fluid --- p.4
Ferrofluid --- p.4
"Comparison Amount ER, MR and Ferrofluid" --- p.5
Chapter CHAPTER THREE: --- THEORETICAL ANALYSIS OF MR FLUIDS FOR MICRO DEVICES --- p.8
Introduction --- p.8
Minimal Volume --- p.8
Magnetic Field Requirement --- p.10
Particle Size --- p.14
Chapter CHAPTER FOUR: --- PROCESSING TECHNOLOGY --- p.15
Introduction --- p.15
Processing Technology --- p.15
Chapter CHAPTER FIVE: --- MR FLUID PILLARS --- p.18
Introduction --- p.18
Description of Experimental Setup --- p.18
Finite element Analysis of the Experiment --- p.23
Alignment Theory of MR Fluid Pillar --- p.29
Discussion of Fluid Surface Tension --- p.36
Chapter CHAPTER SIX: --- APPLICATIONS --- p.39
Introduction --- p.39
MR Fluid Actuator --- p.39
Micro Brake --- p.45
Micro Brake --- p.46
Micro Clutches --- p.46
Damper for Micro-Robot System --- p.46
Chapter CHAPTER SEVEN: --- CONCLUSION --- p.48
APPENDIX --- p.49
BIBLIOGRAPHY --- p.50

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