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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v35.i12.50
10 pages

Experimental and Computational Investigation of the Hydrodynamics and Heat Transfer in a Flat Channel of Variable Width for Smooth and Intensified Surfaces

R. Banker
General Electric CR&D, USA
Mikhail Ya. Belenkiy
JSC "I. I. Polzunov Central Boiler and Turbine Institute" (NPO TsKTI), St. Petersburg, 195257, Russia
Mikhail Gotovskii
I. I. Polzunov Scientific and Development Association on Research and Design of Power Equipment (NPO TsKTI), 3/6 Atamanskaya Str., St. Petersburg, 191167, Russia
B. S. Fokin
JSC "I. I. Polzunov Central Boiler and Turbine Institute" (NPO TsKTI), St. Petersburg, 195257, Russia

ABSTRACT

We present the results of experimental and computational investigation of the resistance and heat transfer in a flat channel of variable width with converging and diverging flows at rather small convergence (divergence) angles. The results were obtained for both smooth surfaces and surfaces with intensification by dimples. It is showed experimentally that for long channels, laminarization and flow instability effects appear even at angles of 1-2°. But there is a noticeable influence only on the resistance coefficient, whereas the behavior of heat transfer is almost the same as in the absence of acceleration for both smooth and intensified surface. The numerical analysis of convective heat transfer in a narrow converging channel with a package of 15 conical dimples on one of its sides generally confirmed the data obtained in physical experiments on the advanced increase in heat transfer as compared to hydraulic resistance. Vortex-type flow synchronization effect in dimples is established.


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