Experimental investigation on heat transfer characteristics in rectangular duct flow of a magnetic fluid under magnetic field

Issue title: Selected Papers from the 15th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2011)

Article type: Research Article

Authors: Motozawa, Masaaki^{a; *} | Chang, Jia^b | Sawada, Tatsuo^c | Kawaguchi, Yasuo^a

Affiliations: [a] Department of Mechanical Engineering, Tokyo University of Science, Chiba, Japan | [b] School of Chemical Engineering, ZhengZhou University, Henan, China | [c] Department of Mechanical Engineering, Keio University, Tokyo, Japan

Correspondence: [*] Corresponding author: Masaaki Motozawa, Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. Tel.: +81 4 7124 1501 (ext. 3963); Fax: +81 4 7123 9814; E-mail: [email protected]

Abstract: Forced convective heat transfer characteristics in a rectangular duct flow of a magnetic fluid under a magnetic field were investigated experimentally. Experiments were performed in which the magnetic field intensity was changed from 0 mT to 500 mT. The Reynolds number based on the hydraulic diameter was set to 820 (laminar flow), 1630 and 2450 (turbulent flow). The magnetic fluid in the rectangular duct was heated with a uniform heat flux. The results of the experiments showed that in the case of laminar flow of the magnetic fluid, when the magnetic field is applied to the magnetic fluid flow, the heat transfer coefficient increases locally in the region where the magnetic field exists. In contrast, in the turbulent flow of the magnetic fluid, heat transfer is not enhanced, but slightly decreases.

Keywords: Magnetic fluid, Forced convective heat transfer, Rectangular duct

DOI: 10.3233/JAE-2012-1514

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 583-588, 2012