Viscous Force Model Analysis of Magnetic Viscous Effect in Magnetic Fluid

Abstract

From the perspective of microscopic mechanism to study the origin and the macroscopic behavior of the magnetic viscosity characteristics need to discuss the magnetic viscosity effects of the magnetic fluid dynamics, and the magnetic viscous forces in the magnetic fluid dynamics equations is the root cause of the magnetic viscosity effects. In the paper, the common expressions of first-order viscous force and quatratic viscous force of the magnetic fluid are derived from combining the magnetic fluid viscosity expression forms under different concentrations together, while based on the molecular circulation theory and electromagnetic dynamics principle, the quatratic magnetic viscous force model of magnetic fluid is derived from the basic relationship between the magnetic relaxation process. Furthermore the coefficient correction model of the quatratic viscous force is given when the solid particles of magnetic fluid present the formation of chain. Finally it shows the magnetic fluid viscous force model and a clear description of the external magnetic field influence on the magnetic fluid viscosity changes.

Typical dampers and energy harvesters based on characteristics of ferrofluids

“…Numerous studies have been conducted on the material itself, such as the magnetization characteristics [103] and magnetoviscous effect [104,105] of ferrofluids. These studies [106,107] confirmed that the performance of a ferrofluid viscous damper is significantly influenced by the viscosity of the material.…”