Research on MRF Shear Stress Measurement Method under Non-Uniform Magnetic

2014 ◽  
Vol 620 ◽  
pp. 347-350
Author(s):  
Shao Qing Ren ◽  
Chun Fu Gao ◽  
Peng Huang ◽  
Xin Sheng He ◽  
Hong Yun Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Theory ◽  
Shear Stress ◽  
Uniform Magnetic Field ◽  
Fluid Shear Stress ◽  
Large Deviation ◽  
Stress Measurement ◽  
Uniform Field ◽  
Application Process ◽  
Magneto Rheological

Magnetorheological fluid as an important branch of the emerging intelligent material, its excellent characteristics make it widely used in electrical system and mechanical system. Common MRF system environment is limited to a uniform magnetic field, the practical application process to the vast of magneto rheological characteristics devices has shown the phenomenon, which does not match the uniform magnetic field theory, the reason is that the actual work environment is the non-uniform magnetic [1-2]. To study the characteristics of MRF shear stress in a non-uniform magnetic field, this paper established a non-uniform field magneto-rheological fluid shear stress measurement device. Comparing the experimental shear stress curves with the uniform magnetic field measured shear stress curves, we found that the non-uniform magnetic field strength of the environmental equivalent shear stress values ​​compared with the uniform magnetic field data have large deviation, this indicates that the existing uniform magnetic field theory is not well to explain non-uniform magnetic field shear properties of MRF, we need to build the introduction of non-uniform magnetic field theory.

Nonlinear interaction between longitudinal waves in a magnetized plasma

1978 ◽  
Vol 19 (3) ◽  
pp. 405-410 ◽  
Author(s):  
A. A. Selim
Keyword(s):  
Magnetic Field ◽  
Field Theory ◽  
Quantum Field Theory ◽  
Nonlinear Interaction ◽  
Uniform Magnetic Field ◽  
Magnetized Plasma ◽  
Quantum Field ◽  
Arbitrary Angle ◽  
Longitudinal Waves ◽  
Coupled Mode

Quantum field theory is used to investigate the resonant nonlinear interaction between three longitudinal waves propagating at any arbitrary angle to a uniform magnetic field in a plasma. The coupled mode equations, coupling coefficient and a formula for the growth rates are derived.

Comparison of Affecting Factors on the Shear Stress Output of Cylinder-Typed MRF Clutch

2015 ◽  
Vol 1094 ◽  
pp. 453-457
Author(s):  
Hai Feng Ji ◽  
Chun Fu Gao ◽  
Xin Sheng He ◽  
Guang Zhang
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Affecting Factors ◽  
Bingham Model ◽  
Theoretical Derivation ◽  
Proportionality Constant ◽  
Magneto Rheological ◽  
The Relationship ◽  
The Magnetic Field ◽  
Main Influence

With the purpose of studying the main influence on the cylinder-typed magneto-rheological fluid (MRF) clutch, the relationship between the output of shear stress and its affecting factors is presented in this paper; through theoretical derivation from the Bingham Model and the cylinder-typed shear model, the stress born by the MRF in the clutch is analysed, and the affecting factors on the clutch is also simulated and verified through experiments. The study shows that as the magnetic field strengthens, the shear stress of the cylinder-typed MRF clutch grows linearly, with proportionality constant at 0.162; the increase of shear rate, relevant to the magnetic field strength, makes little difference to the torque output, with proportionality constant at 0.00026B. The results indicate that mechanical-electrical integration of clutch devices can be achieved through the control of magnetic field output of the electromagnet.

Cylindrically symmetric waves in the magnetohydrodynamic approximation

1972 ◽  
Vol 8 (3) ◽  
pp. 331-340 ◽  
Author(s):  
M. L. Woolley
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Equations Of Motion ◽  
Continuous Group ◽  
Uniform Field ◽  
Cylindrically Symmetric ◽  
Sonic Waves ◽  
Parametric Description ◽  
Full Solution ◽  
The Magnetic Field

The equations of motion of an ideally conducting medium, in the magnetohydrodynamic approximation, are solved exactly under the hypotheses that (i) one component of the magnetic field is constant everywhere, (ii) the magnetic and hydrodynamic pressures are in equilibrium, and (iii) the solution is invariant under a continuous group of transformations which preserves the symmetry of the uniform magnetic field. It is seen that the invariants of the group of transformations form the basis for a parametric description of the full solution that describes the propagation of cylindrically symmetric magneto-sonic waves in the direction of the uniform field. A number of general features of the motion are deduced, and an integral expression is given for the amplitude of the component of velocity, perpendicular to the uniform magnetic field, which undergoes potential well oscillations.

Considerations on Shear Stress in Cylindrical Magneto-rheological fluid Brake for Aircraft under High Temperature and High Magnetic Field

2021 ◽  
Author(s):  
Kazuki Nagashima ◽  
Hiroki Shiga ◽  
Yoshimi Kikuchi ◽  
Hiroyuki Wakiwaka ◽  
Makoto Sonehara ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
High Temperature ◽  
High Magnetic Field ◽  
Magneto Rheological

Analysis of flow of polar and non polar incompressible ferrofluids

2015 ◽  
Vol 10 (2) ◽  
pp. 2733-2740
Author(s):  
Achala Nargund ◽  
Asha C. S
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Pressure Gradient ◽  
Flux Density ◽  
Applied Magnetic Field ◽  
Fluid Shear Stress ◽  
Parallel Plates ◽  
Fluid Shear ◽  
Polar Fluid

In this paper, flow between two parallel plates is analyzed for both polar and non polar ferrofluids. Velocity is obtained without pressure gradient for polar fluid and with pressure gradient for non polar fluid. The solution of the spin velocity is found in terms of applied magnetic field and magnetic flux density for polar fluid. Shear stress is calculated for both polar and non polar ferrofluid.

A mathematical analysis of MHD blood flow of Eyring–Powell fluid through a constricted artery

2016 ◽  
Vol 09 (02) ◽  
pp. 1650027 ◽  
Author(s):  
Najma Saleem ◽  
Sufian Munawar
Keyword(s):  
Magnetic Field ◽  
Mathematical Model ◽  
Blood Flow ◽  
Shear Stress ◽  
Pressure Drop ◽  
Mathematical Analysis ◽  
Uniform Magnetic Field ◽  
Symmetric Form ◽  
Regular Perturbation ◽  
Irregular Shapes

The present study deals with the flow of blood through a stenotic artery in the presence of a uniform magnetic field. Different flow situations are taken into account by considering the regular and irregular shapes of stenosis lying inside the walls of artery. Blood inside the artery is assumed to be Eyring–Powell fluid. A mathematical model is developed and simplified under the physical assumptions of stenosis. The regular perturbation method is adopted to find the solutions for axial velocity and pressure gradient. The variations in pressure drop across the stenosis length, the impedance and the shear stress at the walls of stenotic artery are discussed in detail through graphs. It is observed that the Eyring–Powell fluid is helpful in reducing the resistance to the flow in stenotic artery. Moreover, symmetric form of stenosis is more hazardous as compared to asymmetric stenosis.

scholarly journals Investigation of hydrodynamic clutch with a magnetorheological fluid

2018 ◽  
Vol 30 (1) ◽  
pp. 155-168 ◽  
Author(s):  
Artur Olszak ◽  
Karol Osowski ◽  
Zbigniew Kesy ◽  
Andrzej Kesy
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Fluid Shear Stress ◽  
Magnetorheological Fluid ◽  
Design Parameters ◽  
Working Fluid ◽  
Experimental Investigations ◽  
Transmitted Power ◽  
Fluid Shear ◽  
Flow Losses

This article presents the results of experimental investigations and simulations for a new design of a hydrodynamic clutch with a magnetorheological working fluid. The concept of magnetorheological fluid applications to improve the performance of a hydrodynamic clutch can be realized using resistant flow control inside a hydrodynamic clutch channel by changing the fluid shear stress with magnetic fields. The increase in the shear stress of a working fluid under a magnetic field causes an increase in the pressure drop in the channels, an increase in the flow losses, and a decrease in the transmitted power. Moreover, the steady-state and dynamic characteristics of the clutch are presented and the relations that occur between the design parameters are shown.

Shear Transmission of Magnetorheological Fluid in Fan Clutch

2012 ◽  
Vol 233 ◽  
pp. 84-87
Author(s):  
Jiu Hua Wang ◽  
Lian Cheng Ren ◽  
Zhen Zhen Lei
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Applied Magnetic Field ◽  
Magnetorheological Fluid ◽  
Bingham Model ◽  
Operational Principle ◽  
Mr Fluids ◽  
Torque Transmission ◽  
Magneto Rheological ◽  
Transmission Ability

A magneto-rheological (MR) fan clutch is a device that transmits torque by the shear stress of the MR fluids. In this paper, Bingham model is used to describe the constitutive characteristics of MR fluids subject to an applied magnetic field. The operational principle of the MR clutch is introduced. The torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the MR clutch. The results show that with the increase of the applied magnetic field, the torque developed by MR fluids goes up rapidly.

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