Natural Convection in a Vertical Enclosure With Internal Permeable Screen

[+] Author and Article Information
Z. Zhang, A. Bejan, J. L. Lage

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706

J. Heat Transfer 113(2), 377-383 (May 01, 1991) (7 pages) doi:10.1115/1.2910572 History: Received June 21, 1990; Revised October 01, 1990; Online May 23, 2008


This paper documents the thermal insulation effect of a screen installed inside a vertical rectangular enclosure (e.g., double-glazed window). The screen is a venetian blind system made out of horizontal strips that can be rotated. The focus is on the “closed” position, where the strips almost touch. The effect of this permeable screen on the temperature field, the flow field, and the overall heat transfer rate is determined numerically. The study shows that there exists a ceiling (critical) conductance for the air leakage through the screen, above which the screen does not cause a significant drop in the overall heat transfer rate. A numerical example shows how this critical conductance can be used to calculate the critical spacing that can be tolerated between two consecutive strips in the screen.

Copyright © 1991 by The American Society of Mechanical Engineers
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