Numerical Study of Turbulent Convection in a Channel with Modified V-Baffles
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Abstract
A numerical work has been conducted to examine turbulent flow and heat transfer characteristics in a three-dimensional channel with modified V-baffles placed on the lower wall. The heat flux condition is applied only to the lower wall while the upper wall is insulated. The computations are based on the finite volume method with the Coupled algorithm for the airflow rate in terms of Reynolds numbers ranging from 4,000 to 20,000. The computation reveals that pairs of counter-rotating vortices created by the modified V-baffle induce impingement/attachment flows on the walls leading to greater increase in heat transfer over the heated wall. The maximum value of the thermal enhancement factor, h is found to be 2.25 at BRf=0.04, BRb=0.20 and Re=4000.
Article Details
Copyright @2021 Engineering Transactions
Faculty of Engineering and Technology
Mahanakorn University of Technology
References
[2] K.M. Kelkar and S.V. Patankar, “Numerical prediction of flow and heat transfer in a parallel plate channel with staggered fins,” ASME J. Heat Transfer, vol. 109, pp. 25-30, 1987.
[3] B.W. Webb and S. Ramadhyani, “Conjugate heat transfer in a channel with staggered ribs,” Int. J. Heat Mass Transfer, vol. 28, pp. 1679–1687, 1985.
[4] S. Sripattanapipat and P. Promvonge, “Numerical analysis of laminar heat transfer in a channel with diamond-shaped baffles,” Int. Commun. Heat Mass Transfer, vol.36, pp. 32–38, 2009.
[5] K.H. Ko and N.K. Anand, “Use of porous baffles to enhance heat transfer in a rectangular channel,” Int. J. of Heat and Mass Transfer, vol. 46, pp. 4191-4199, 2003.
[6] J.C. Han and Y.M. Zhang, “High performance heat transfer ducts with parallel broken and V-shaped broken ribs,” Int. J. Heat Mass Transfer, vol. 35, pp. 513–523, 1992.
[7] P. Promvonge, S. Sripattanapipat, S. Tamna, S. Kwankaomeng, C. Thianpong, “Numerical investigation of laminar heat transfer in a square channel with 45 deg inclined baffles,” Int. Commun. Heat Mass Transfer, vol. 37(2), pp. 170-177, 2010.
[8] T.M. Liou and J.J. Hwang, “Effect of ridge shapes on turbulent heat transferand friction in a rectangular channel,” Int. J. Heat Mass Transfer, vol. 36, pp. 931–940, 1993.
[9] S.Tamna, S.Skullong, C. Thianpong, P. Promvonge, Heat transfer behaviors in a solar air heater channel with multiple V-baffle vortex generators, Solar Energy, vol. 110 , pp. 720-735, 2014.
[10] P. Promvonge, S. Skullong, Thermo-hydraulic performance in heat exchanger tube with V-shaped winglet vortex generator, Appl. Therm. Eng., vol. 164, 2020.
[11] Versteeg H.K. and Malalasekera W., An Introduction to Computational Fluid Dynamics: The Finite Volume Method, Longman Scientific & Technical, Longman Group Limited, English, 1995.
[12] ANSYS 2021 R2, Fluent User's Guide, 2021.