scholarly journals Effects of temperature on performance of compressible magnetorheological fluid suspension systems

2017 ◽  
Vol 29 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Michael McKee ◽  
Faramarz Gordaninejad ◽  
Xiaojie Wang
Keyword(s):  
Theoretical Model ◽  
Energy Dissipation ◽  
Bulk Modulus ◽  
Temperature Effect ◽  
Magnetorheological Fluid ◽  
Suspension System ◽  
Shear Yield Stress ◽  
Temperature Dependent ◽  
Suspension Systems ◽  
Shear Yield

The temperature effect on performance of compressible magnetorheological fluid suspension systems is studied. Magnetorheological fluid is a temperature-dependent material where its compressibility and rheological properties change with temperature. Experimental studies were conducted to explore the temperature effects on the properties of the magnetorheological fluid and the compressible magnetorheological fluid suspension systems. The temperature effect on magnetorheological fluid properties included the bulk modulus, shear yield stress, and viscosity. It was found that the shear yield stress of the magnetorheological fluid remains unchanged within the testing range while both the plastic viscosity, using the Bingham plastic model, and the bulk modulus of the magnetorheological fluid decrease as the temperature of the fluid increases. A theoretical model that incorporates the temperature-dependent properties of magnetorheological fluid was developed to predict behavior of a compressible magnetorheological fluid suspension system. An experimental study was conducted using an annular flow compressible magnetorheological fluid suspension system with varying temperatures, motion frequencies, and magnetic fields. The experimental results are used to verify the theoretical model. Moreover, the stiffness and energy dissipation of the compressible magnetorheological fluid suspension system were obtained, experimentally. The effects of the temperature on performance characteristics of the compressible magnetorheological fluid suspension system were analyzed. It was found that both the stiffness and the energy dissipation decrease with an increase in the temperature of magnetorheological fluid.

Behavior of a Compressible Magnetorheological Fluid Damper at High Temperatures

2011 ◽  
Author(s):  
Micheal McKee ◽  
Xiaojie Wang ◽  
Faramarz Gordaninejad
Keyword(s):  
Theoretical Model ◽  
Bulk Modulus ◽  
Yield Stress ◽  
Magnetorheological Fluid ◽  
Effect Of Temperature ◽  
Temperature Dependent ◽  
Bingham Plastic ◽  
Shear Yield ◽  
Fluid Dampers ◽  
Temperature Dependent Properties

This study focuses on the effect of temperature on the performance of compressible magnetorheological fluid dampers (CMRDs). In addition to change of properties in the presence of a magnetic field, magnetorheological fluids (MRFs) are temperature-dependent materials that their compressibility and rheological properties change with temperature, as well. A theoretical model that incorporates the temperature-dependent properties of MRF is developed to predict the behavior of a CMRD. An experimental study is also conducted using an annular flow CMRD with varying temperatures, motion frequencies, and magnetic fields. The experimental results are used to verify the theoretical model. The effect of temperature on the MRF properties, such as, the bulk modulus, yield stress and viscosity, are explored. It is found that the shear yield stress of the MRF remains unchanged within the testing range while both the plastic viscosity, using the Bingham plastic model, and the bulk modulus of the MRF decrease as temperature increases. In addition, it is observed that both the stiffness and the energy dissipation decrease with an increase in temperature.

scholarly journals Effect of Particle Characteristics and Temperature on Shear Yield Stress of Magnetorheological Fluid

2016 ◽  
Vol 21 (2) ◽  
pp. 244-248 ◽  
Author(s):  
Xiangfan Wu ◽  
Xingming Xiao ◽  
Zuzhi Tian ◽  
Fei Chen ◽  
Wang Jian
Keyword(s):  
Yield Stress ◽  
Magnetorheological Fluid ◽  
Shear Yield Stress ◽  
Particle Characteristics ◽  
Shear Yield

Magnetorheological Fluid Test and Application

2011 ◽  
Vol 396-398 ◽  
pp. 2158-2161
Author(s):  
Dong Mei Zhao ◽  
Xue Peng Liu
Keyword(s):  
Yield Stress ◽  
Stress Test ◽  
Magnetorheological Fluid ◽  
Shear Yield Stress ◽  
Control Engineering ◽  
Mechanics Model ◽  
Shear Yield ◽  
Fluid Mechanics Model ◽  
Fluid Test ◽  
Static Shear

Magnetorheological fluid is a kind of new intelligent materials, because of its good controllable and mechanical properties; therefore it can be widely used in aerospace, mechanical engineering and automotive engineering, precision processing engineering, control engineering and engineering field. This paper introduces magnetorheological fluid mechanics model of MRF, temperature static shear yield stress, and the influence of MRF static shear yield stress test, introduces magnetorheological fluid in the application of variable hardness collar. The application tendency of the magnetic fluid flow is pointed out

The shear and compressive yield stress of fibrillated acacia pulp fiber suspensions

2020 ◽  
Vol 35 (2) ◽  
pp. 243-250
Author(s):  
Jiulong Sha ◽  
Yueyue Yang ◽  
Can Wang ◽  
Wei Li ◽  
Peng Lu ◽  
...  
Keyword(s):  
Yield Stress ◽  
Paper Industry ◽  
Pulp Fiber ◽  
Fiber Suspensions ◽  
Fiber Morphology ◽  
Shear Yield Stress ◽  
Geometrical Properties ◽  
Compressive Yield Stress ◽  
Shear Yield ◽  
Fiber Cell Wall

AbstractThe degree of interactions between fibers and the tendency of fibers to form flocs play an important role in effective unit operation in pulp and paper industry. Mechanical treatments may damage the structure of the fiber cell wall and geometrical properties, and ultimately change the fiber-fiber interactions. In this study, the gel crowding number, compressive and shear yield stress of fibrillated acacia pulps were investigated, and the results showed that the gel crowding number of the refined pulp samples ranged from 8.7 to 10.7, which were much lower than that of un-refined pulps. As the concentration increased, both the compressive yield stress {P_{y}} and shear yield stress {\tau _{y}} of all suspensions increased accordingly, and the yield stress was found to depend on a power law of the crowding number. Moreover, the values of {\tau _{y}}/{P_{y}} were also examined and the variation of {\tau _{y}}/{P_{y}} became largely dependent on the fiber morphology and mass concentration.

Electronic Properties of Bismuth Nanowires

2001 ◽  
Vol 679 ◽  
Author(s):  
Stephen B. Cronin ◽  
Yu-Ming Lin ◽  
Oded Rabin ◽  
Marcie R. Black ◽  
Gene Dresselhaus ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Band Structure ◽  
Temperature Dependence ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Temperature Dependent ◽  
Si Substrates ◽  
Bismuth Nanowires ◽  
Bi Nanowire ◽  
Anodic Alumina Templates

ABSTRACTThe pressure filling of anodic alumina templates with molten bismuth has been used to synthesize single crystalline bismuth nanowires with diameters ranging from 7 to 200nm and lengths of 50μm. The nanowires are separated by dissolving the template, and electrodes are affixed to single Bi nanowires on Si substrates. A focused ion beam (FIB) technique is used first to sputter off the oxide from the nanowires with a Ga ion beam and then to deposit Pt without breaking vacuum. The resistivity of a 200nm diameter Bi nanowire is found to be only slightly greater than the bulk value, while preliminary measurements indicate that the resistivity of a 100nm diameter nanowire is significantly larger than bulk. The temperature dependence of the resistivity of a 100nm nanowire is modeled by considering the temperature dependent band parameters and the quantized band structure of the nanowires. This theoretical model is consistent with the experimental results.

Shear yield stress of partially flocculated colloidal suspensions

AIChE Journal ◽  
1998 ◽  
Vol 44 (3) ◽  
pp. 538-544 ◽  
Author(s):  
Peter J. Scales ◽  
Stephen B. Johnson ◽  
Thomas W. Healy ◽  
Prakash C. Kapur
Keyword(s):  
Yield Stress ◽  
Colloidal Suspensions ◽  
Shear Yield Stress ◽  
Shear Yield
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