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RESEARCH PAPERS

Transient Natural Convection of Water in a Horizontal Pipe With Constant Cooling Rate Through 4°C

[+] Author and Article Information
K. C. Cheng, M. Takeuchi

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada

J. Heat Transfer 98(4), 581-587 (Nov 01, 1976) (7 pages) doi:10.1115/1.3450604 History: Received June 14, 1976; Online August 11, 2010

Abstract

A theoretical analysis is carried out to study the influence of an anomalous density-temperature relationship of water on the transient natural convection in horizontal cylinders with wall temperature decreasing at a uniform rate. Numercial solutions are obtained for three cases involving different cooling rates, pipe diameters, and initial uniform water temperatures for temperature conditions between 0 and 7°C. The transient flow and temperature fields, and local and overall heat transfer rates are presented to study the inversion of flow patterns caused by the maximum density at 4°C. The numerical results are compared with the experimental measurements and predictions of a quasi-steady boundary-layer model reported by Gilpin [2], and generally a good agreement is observed. Some implications on the subsequent freezing process are pointed out.

Copyright © 1976 by ASME
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