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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

BUOYANCY EFFECT ON HEAT TRANSFER IN FORCED CHANNEL FLOWS

B. S. Petukhov
Institute of High Temperatures of the Russian Academy of Sciences, Moscow, Russia

Anatoly F. Polyakov
Department of Heat Transfer, Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13/19, Moscow 127412, Russia

Oleg G. Martynenko
A. V. Luikov Institute of Heat and Mass Transfer, National Academy of Sciences of Belarus, 15 P. Brovka str., 220072, Minsk, Belarus

DOI: 10.1615/IHTC7.4390
pages 343-362

Abstract

The paper discusses the results of experimental and computational and theoretical studies of forced laminar and turbulent flows and heat transfer in channels under the conditions of an essential buoyancy effect. The main attention is given to upward and downward turbulent motion of liquid in heated vertical tubes.
The boundaries and character of thermogravitational forces effect on velocity and temperature distribution, friction resistance and local heat transfer are determined. Relationships for calculation of boundaries of the gravity force field effect are generalized.
In the case of a turbulent flow, the buoyancy effect on the averaged flow and on fluctuating motion are analyzed.

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