Magnetoviscosity and relaxation in ferrofluids

被引:75
作者
Felderhof, BU [1 ]
机构
[1] Rhein Westfal TH Aachen, Inst Theoret Phys, D-52056 Aachen, Germany
关键词
D O I
10.1103/PhysRevE.62.3848
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The increase in viscosity of a ferrofluid due to an applied magnetic field is discussed on the basis of a phenomenological relaxation equation for the magnetization. The relaxation equation was derived earlier from irreversible thermodynamics, and differs from that postulated by Shliomis. The two relaxation equations lend to a different dependence of viscosity on magnetic field, unless the relaxation rates are related in a specific field-dependent way. Both planar Couette flow and Poiseuille pipe flow in parallel and perpendicular magnetic field are discussed. The entropy production for these situations is calculated and related to the magnetoviscosity.
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页码:3848 / 3854
页数:7
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