Abstract
The effect of wall geometry on the flow and heat transfer in a channel with one lower furrowed and an upper flat wall kept at a uniform temperature is investigated by large eddy simulation. Three channels, one with sinusoidal wavy surface having the ratio (amplitude to wavelength) α/λ=0.05 and the other two with furrowed surface derived from the sinusoidal curve, are considered. The numerical results show that the streamwise vortices center is located near the lower wall and vary along the streamwise on various furrow surfaces. The furrow geometry increases the pressure drag and decreases the friction drag of the furrowed surface compared with that of the smooth surface; consequently, the total drag is increased for the augment of pressure drag. As expected, the heat transfer performance has been improved. Finally, a thermal performance factor is defined to evaluate the performance of the furrowed wall.
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Wang, J., Gao, X. & Li, W. Flow and heat transfer characteristics in a channel having furrowed wall based on sinusoidal wave. Korean J. Chem. Eng. 32, 2187–2203 (2015). https://doi.org/10.1007/s11814-015-0032-z
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DOI: https://doi.org/10.1007/s11814-015-0032-z