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Energies 2016, 9(6), 415; doi:10.3390/en9060415

CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs

School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
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Academic Editor: Francesco Calise
Received: 31 March 2016 / Revised: 11 May 2016 / Accepted: 19 May 2016 / Published: 28 May 2016
(This article belongs to the Special Issue Solar Cooling and Heating)
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Abstract

This study presents the heat transfer and fluid flow characteristics in a rib-roughened SAH (solar air heater) channel. The artificial roughness of the rectangular channel was in the form of a thin circular wire in discrete multi V-pattern rib geometries. The effect of this geometry on heat transfer, fluid flow, and performance augmentation was investigated using the CFD (computational fluid dynamics). The roughness parameters were a relative discrete distance of 0.69, a relative rib height of 0.043, a relative rib pitch of 10, a relative rib width of 6.0, and a flow-attack-angle of 60°. The discrete width ratios and Reynolds numbers ranged from 0.5 to 2.0 and from 2000 to 20,000, respectively. The CFD results using the renormalization k-epsilon model were in good agreement with the empirical relationship. This model was used to investigate the heat transfer and fluid flow characteristics in the multi V-pattern rib roughened SAH channel. The thermo-hydraulic performance was found to be the best for the discrete width ratio of 1.0. A discrete multi V-pattern rib combined with dimple staggered ribs also had better overall thermal performance compared to other rib shapes. View Full-Text
Keywords: thermal hydraulic performance; heat transfer enhancement; SAH; solar energy thermal hydraulic performance; heat transfer enhancement; SAH; solar energy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kumar, A.; Kim, M.-H. CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs. Energies 2016, 9, 415.

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