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RESEARCH PAPERS

Transient Natural Convection in Enclosures at High Rayleigh Number

[+] Author and Article Information
D. A. Olson

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

L. R. Glicksman

Department of Architecture and Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Heat Transfer 113(3), 635-642 (Aug 01, 1991) (8 pages) doi:10.1115/1.2910612 History: Received May 16, 1990; Revised April 23, 1991; Online May 23, 2008

Abstract

Transient natural convection at Rayleigh numbers of 1010 was studied experimentally in two enclosures of aspect ratio 1/3, one a 1:5.5 physical scale model containing the dense refrigerant gas R114, and the second a full-scale room containing air. In one type of transient the vertical endwall temperature was suddenly changed, while in a second type of transient the isothermal, well-mixed gas was suddenly exposed to hot and cold vertical endwalls. The experiments indicated that the dominant time constant was a convective one. Comparisons between the scale model and full scale show that R114 gas can simulate the transient behavior of air-filled enclosures.

Copyright © 1991 by The American Society of Mechanical Engineers
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