Steady RANS of Flow and Heat Transfer in a Smooth and Pin-Finned U-Duct with a Trapezoidal Cross Section

[+] Author and Article Information
Kenny Hu

School of Aeronautics and Astronautics, Purdue University

Xingkai Chi

School of Aeronautics and Astronautics, Purdue University

Tom I-P. Shih

School of Aeronautics and Astronautics, Purdue University

Dr. Minking K. Chyu

Swanson School of Engineering, University of Pittsburgh

Michael E. Crawford

Professor Emeritus of Mechanical Engineering, The University of Texas at Austin

1Corresponding author.

ASME doi:10.1115/1.4042332 History: Received June 22, 2018; Revised December 18, 2018


Steady RANS were performed to examine the ability of four turbulence models - realizable k-e(k-e), shear-stress transport(SST), Reynolds stress model with linear pressure strain(RSM-LPS), and stress-omega RSM(RSM-t?) - to predict the turbulent flow and heat transfer in a trapezoidal U-duct with and without a staggered array of pin fins. Results generated for the heat-transfer coefficient (HTC) were compared with experimental measurements. For the smooth U-duct, the maximum relative error in the averaged HTC in the up-leg is 2.5% for k-e, SST, and RSM-t? and 9% for RSM-LPS. In the turn region, that maximum is 50% for k-e and RSM-LPS, 14.5% for RSM-t?, and 29% for SST. In the down-leg, SST gave the best predictions and RSM-t? being a close second with maximum relative error less than 10%. The ability to predict the separated flow downstream of the turn dominated the performance of the models. For the U-duct with pin fins, SST and RSM-t? predicted the best, and k-e predicted the least accurate HTCs. For k-e, the maximum relative error is about 25%, whereas it is 15% for the SST and RSM-t?, and they occur in the turn. In the turn region, the staggered array of pin fins was found to behave like guide vanes in turning the flow. The pin fins also reduced the size of the separated region just after the turn.

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