An Application of the Optical Correlation Computer to the Detection of the Malkus Transitions in Free Convection

[+] Author and Article Information
E. F. C. Somerscales

Rensselaer Polytechnic Institute, Troy, N.Y. 12181

H. B. Parsapour

IBM Corporation, Charlotte, N.C. 28257

J. Heat Transfer 104(2), 255-263 (May 01, 1982) (9 pages) doi:10.1115/1.3245081 History: Received March 23, 1981; Online October 20, 2009


This paper presents the results of an investigation concerned with measurements of the scale-size of the flow patterns near the so-called Malkus transitions. The flow patterns in a heated fluid layer were photographed at various Rayleigh numbers and these photographs subjected to quantitative analysis using an optical correlation computer. The results showed that the method provides a very sensitive technique for locating the transitions. Transitions reported by other investigators have been confirmed for Rayleigh numbers between 5.0 × 103 and 1.0 × 106 , and an additional, previously unobserved, transition has been detected. Heat-transfer measurements were also made. This data demonstrated the limitations, compared to the optical method, of this approach to the detection of transitions.

Copyright © 1982 by ASME
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