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Journal of Enhanced Heat Transfer
IF: 1.406 5-Year IF: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2018021403
pages 293-313

NUMERICAL INVESTIGATION OF WAVY MICROCHANNELS WITH RECTANGULAR CROSS SECTION

P. M. Mithun Krishna
Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Thiruvananthapuram, India, 695547
M. Deepu
Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, India, 695547
S. R. Shine
Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Trivandrum – 695547, Kerala, India

ABSTRACT

Computational results are presented that describe thermo-hydrodynamic behavior of wavy microchannels of various geometric configurations. The configurations have been obtained by changing the geometric parameters such as relative waviness and aspect ratio for a constant hydraulic diameter of 400 μm. A 3D, steady, laminar conjugate model is developed and validated against available experimental data. A comparative study on wavy and straight channels has been conducted. Fluid flow and heat transfer characteristics have been studied for distinct configurations of wavy channel and it is found that the thermo-hydrodynamic behavior of fluid flow strongly depends on relative waviness and aspect ratio. The increased heat transfer and pressure drop are due to the occurrence of vortices that develop within the channel. Variation of local Nusselt number has been analyzed and found to follow similar trend for different aspect ratios. A performance parameter known as channel effectiveness has been used to analyze the combined effect of heat transfer and pressure drop. Results show that higher waviness channels with an aspect ratio of 1 can be recommended for obtaining higher effectiveness.


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