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RESEARCH PAPERS: Porous Media, Particles, and Droplets

Variations of Buoyancy-Induced Mass Flux From Single-Phase to Two-Phase Flow in a Vertical Porous Tube With Constant Heat Flux

[+] Author and Article Information
T. S. Zhao, Q. Liao, P. Cheng

Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

J. Heat Transfer 121(3), 646-652 (Aug 01, 1999) (7 pages) doi:10.1115/1.2826028 History: Received September 10, 1998; Revised February 26, 1999; Online December 05, 2007

Abstract

This paper presents an experimental study of a buoyancy-induced flow of water with phase-change heat transfer in a vertical porous tube heated at a constant heat flux. Experiments were carried out from subcooled liquid flow to connective boiling by varying the imposed heat fluxes. At a prescribed heat flux the steady-state mass flux of water, as well as the temperatures along the tube wall and along the centerline of the packed tube, were measured. It is shown that for both single-phase flow and the two-phase flow with a rather low vapor fraction, the induced mass flux increased as the heat flux was increased. However, as the imposed heat flux was increased further, the induced mass flux dropped drastically, and remained relatively constant afterwards. The influences of various parameters such as the porous tube diameter, the particle sizes, and the hydrostatic head on the induced mass flux are also examined.

Copyright © 1999 by The American Society of Mechanical Engineers
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