3D numerical analysis on mechanisms of flow and heat transfer in a square channel with right triangular wavy surfaces
W. Jedsadaratanachai1 and A. Boonloi2
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1King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand
2King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand
E-mail: amnartb@kmutnb.ac.th">amnartb@kmutnb.ac.th*
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Keywords: right triangular wavy surface; heat transfer; friction loss; thermal enhancement factor; numerical investigation
Pages: 387–404
Abstract
Numerical investigations on thermo-hydraulic performance and mechanisms of flow and heat transfer in a square channel heat exchanger inserted with right triangular wavy surfaces are examined. The influence of the flow attack angles (30°, 45° and 60°) is investigated for laminar flow (Re = 100-2000). The configurations of the right triangular wavy surfaces are varied as inclined and V-shaped wavy surfaces (the pointing of V-tip with downstream and upstream called “V-downstream” and “V-upstream”, respectively). The insertions of the wavy surfaces in the channel heat exchanger are divided into two types: middle and diagonal insertions. The computational results reveal that the maximum thermal enhancement factor, TEF, is around 2.31 for the 30° V-downstream wavy surface with diagonal insertion at Re = 2000.
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