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RESEARCH PAPERS: Phase-Change Heat Transfer

Flow and Cold Heat-Storage Characteristics of Phase-Change Emulsion in a Coiled Double-Tube Heat Exchanger

[+] Author and Article Information
H. Inaba, S. Morita

Department of Mechanical Engineering, Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1, Okayama, Japan

J. Heat Transfer 117(2), 440-446 (May 01, 1995) (7 pages) doi:10.1115/1.2822541 History: Received February 01, 1994; Revised July 01, 1994; Online December 05, 2007

Abstract

This paper dealt with the flow and cold heat-storage characteristics of the oil (tetradecane, C14 H30 , freezing point 278.9 K)/water emulsion as a latent heat-storage material having a low melting point. A coiled double-tube heat exchanger was used for the cold heat-storage experiment. The pressure drop, the heat transfer coefficient, and the finishing time of cold heat storage in the coiled tube were measured as experimental parameters. It was understood that the flow behavior of the emulsion as a non-New-tonian fluid had an important role in the present cold heat storage. The useful nondi-mensional correlation equations for the additional pressure loss coefficient, the heat transfer coefficient, and the cold heat storage time were derived in terms of modified Dean number and heat capacity ratio.

Copyright © 1995 by The American Society of Mechanical Engineers
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