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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

EFFECTIVE THERMAL CONDUCTIVITY OF FULLY AND PARTIALLY SATURATED METAL WICKS

Get access (open in a dialog) DOI: 10.1615/IHTC6.2750
pages 91-97

摘要

The present work presents an experimental study of the effective thermal conductivity of fully and partially saturated sintered fiber metal wicks. An experimental apparatus, based on the steady state method of comparison, was designed and used for determining the effective thermal conductivity of nickel 200, stainless steel 430, and copper wicks, covering a porosity range from 0.30 to 0.67. Three cases were studied: (1) wicks fully saturated with air (2) wicks fully saturated with water, and (3) wicks partially saturated with water and water vapor. National Bureau of Standards austenitic stainless steel was used as the reference material of known thermal conductivity. Based on the experimental results a single correlation is presented for predicting the effective thermal conductivity of all wicks fully saturated with air, water and water vapor. For the case of wicks partially saturated with water and water vapor, the effective thermal conductivity of each of the phases was determined separately and then the total combined effective thermal conductivity was found using the knowledge of the interface position. For all wicks studied it was possible to stabilize the interface at an arbitrary position. For wick specimens with both high porosity and large matrix thermal conductivity, a liquid-vapor transition zone was observed between the phases. The presnece of this heat pipe like transition zone increased the total combined effective thermal conductivity of the wicks.