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Abstract
The aim of this article is to understand numerically the flow and heat transfer characteristics under oscillating flow conditions for periodically corrugated wavy channel. For the same channel, under steady-state flow conditions, experimental and numerical studies were done under steady-state flow conditions by our two previous studies. Three turbulence models are used, namely the k–ω, the Shear Stress Transport (SST), and the transition SST. According to the previous study, the best agreement with experiments was obtained using the SST turbulence model. Therefore, the SST turbulence model is applied in this study on the oscillating flow. The finite volume method is used as the numerical method. Investigations are performed for air flowing through corrugated channel which has sharp wavy peaks with an inclination angle of 30° and 5 mm minimum channel height. Reynolds number is varied within the range 6294–7380, while keeping the Prandtl number constant at 0.70. Four different sinusoidal oscillating flow conditions are used. Variations of the Nusselt number, friction factor, and thermo-hydraulic performance factor with the Reynolds number are studied.
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Notes on contributors
Erman Aslan
Erman Aslan received his B.Sc., M.Sc., and Ph.D. in Mechanical Engineering from the University of Sakarya, Turkey. He was visiting researcher to prepare his Ph.D. thesis at Duesseldorf University of Applied Sciences, Germany. He is an Assistant Professor of Mechanical Engineering Department at Istanbul University, Cerrahpasa, Turkey. His research area is Lattice Boltzmann method, computational fluid dynamics, forced convection, aerodynamics, and heat transfer.
Mert Ozsaban
Mert Ozsaban is a Ph.D. student in Mechanical Engineering, at Istanbul University-Cerrahpasa, Turkey, under supervision of. Prof. H. Riza Guven. He received his M.Sc. degree in Mechanical Engineering in 2009 from Omer Halis Demir University, Nigde, Turkey. He is currently working on wavy channels.
Guven Ozcelik
Guven Ozcelik is a research assistant at Istanbul AREL University, Buyukcekmece, Istanbul. He received his B.Sc. from the Istanbul University, Avcilar, Istanbul. In addition, he received his M.Sc. from Yildiz Technical Universtiy, Istanbul. He is currently working on heat transfer enhancement in heat exchangers under theoretical and numerical aspects.
Hasan Riza Guven
Hasan Riza Güven is a Professor of Energy at Istanbul University-Cerrahpasa, Turkey. He received his M.Sc. degree from Bosphorus University and his Ph.D. degree from Yıldız Technical University, Istanbul, Turkey. He has been the head of Mechanical Engineering Department of the Istanbul University-Cerrahpasa for 2 years. He is currently working on numerical investigations for convective heat transfer.