Planform Structure of Turbulent Rayleigh-Bénard Convection

Theerthan, Ananda S and Arakeri, Jaywant H (1994) Planform Structure of Turbulent Rayleigh-Bénard Convection. In: International Communications in Heat and Mass Transfer, 21 (4). pp. 561-572.

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Abstract

The planform structure of turbulent Rayleigh-B6nard convection is obtained from visualising a liquid crystal sheet stuck to the bottom hot surface. The bottom plate of the convection cell is Plexiglas and the top plate is glass. Water is the test liquid and the Rayleigh number is $4 X 10^7$. The planform pattern reveals randomly moving hot streaks surrounded by cold regions sug- gesting that turbulent Rayleigh-Bdnard convection is dominated by quasi-two- dimensional randomly moving plumes. Simultaneous temperature traces from two vertically separated thermocouples indicate that these plumes may be in- clined forward in the directon of horizontal motion. The periodic eruption of thermals observed by Sparrow et al [3] and which forms the basis of Howard's model is not observed.

Item Type:	Journal Article
Publication:	International Communications in Heat and Mass Transfer
Publisher:	Elsevier
Additional Information:	The copyright of this artilc belongs to Elsevier.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	01 Aug 2006
Last Modified:	19 Sep 2010 04:29
URI:	http://eprints.iisc.ac.in/id/eprint/7807

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