Measuring the rotational viscosity of ferrofluids without shear flow

被引：50
|
作者：
Embs, J
Müller, HW
Wagner, C
Knorr, K
Lücke, M
机构：
[1] Univ Saarland, D-66041 Saarbrucken, Germany
[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
来源：
PHYSICAL REVIEW E | 2000年 / 61卷 / 03期
关键词：
D O I：
10.1103/PhysRevE.61.R2196
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 shear free solid-body rotation of a ferrofluid in a magnetic field experiences a damping due to internal rotational friction. A device based on the principle of a torsional pendulum is presented. It allows us to perform direct and precise measurements of the field dependence of the genuine rotational viscosity without a disturbing shear flow. Experimental results for a moderately concentrated ferrofluid compare reasonably well with theoretical models for monodisperse ferrofluids of noninteracting rigid dipoles.
引用
收藏
页码：R2196 / R2199
页数：4
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