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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EXPERIMENTAL STUDY ON HEAT TRANSFER FROM A CYLINDER SUBMERGED IN A NON-NEWTONIAN FLUID

Kenji Takahashi
Mechanical Engineering Research Laboratory, Hitachi, Ltd., 502 Kandatsu, Tsuchiura, Ibaraki, 300-0013, Japan

Masanobu Maeda
Dept. of System Design Engineering, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama, 223-8522

Shigeru Ikai
Keio University, Kohoku, Yokohama, Japan

DOI: 10.1615/IHTC6.1470
pages 335-339

Abstract

Much information is given on the forced convective heat transfer to a Newtonian fluid for submerged bodies but little data are presented on a non-Newtonian fluid even for a circular cylinder of fundamental systems. The present study is then experimentally performed on the heat transfer of circular cylinder submerged in a CMC solution which will be regarded as power-law fluid. For measurements of flow velocity a laser Doppler velocimeter was applied in order to prevent errors caused by a submerged probe in the non-Newtonian fluid. The cylinder surface covered with the stainless foil of 10 µm in thickness was electrically heated to uniform temperature. The obtained Nusselt number could be correlated to a function of a generalized Reynolds number and to a generalized Prandtl number given by Acrivos et al. (8) . These results are also similarly expressed by empirical formula; Nu=c·Rem·Prn which is appropriated for a Newtonian fluid. Therefore it is evident that formula of this type can be extended to evaluate the average heat transfer coefficient in the case of power-law non-Newtonian fluid, using a generalized Reynolds number and a generalized Prandtl number.

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