Non-Newtonian flow of dilute ferrofluids in a uniform magnetic field

Huei Chu Weng, Chieh Li Chen, Cha'O Kuang Chen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Nonequilibrium magnetization states predict non-Newtonian ferrofluid properties. It is desirable to understand the corresponding flow fields and characteristics. In this study, we derive a magnetoviscosity expression coming from the effective-field method and describing the shear-thinning non-Newtonian behavior of dilute ferrofluids with finite magnetic anisotropy. A mathematical model is developed of non-Newtonian plane flow with respect to shear and pressure driving mechanisms in the presence of an applied stationary uniform magnetic field oriented in the direction perpendicular to vorticity. The results reveal that the non-Newtonian effect tends to increase the velocity and angular velocity but to reduce the magnetization strength. Moreover, an enhanced flow rate and reduced flow drag may be obtained. The maximum non-Newtonian effect is found at a ratio of the Néel relaxation time to the Brownian relaxation time of the order of 0.1.

Original languageEnglish
Article number056305
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume78
Issue number5
DOIs
Publication statusPublished - 2008 Nov 14

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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