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http://dx.doi.org/10.7836/kses.2015.35.4.043

Numerical study on overall thermal performance in SAH duct with compound roughness of V-shaped ribs and dimples  

Kumar, Anil (School of Mechanical Engineering, Kyungpook National University)
Kim, Man-Hoe (School of Mechanical Engineering, Kyungpook National University)
Publication Information
Journal of the Korean Solar Energy Society / v.35, no.4, 2015 , pp. 43-55 More about this Journal
Abstract
This paper presents the thermal hydraulic performance of a three dimensional rib-roughened solar air heater (SAH) duct with the one principal wall subjected to uniform heat flux. The SAH duct has aspect ratio of 12.0 and the Reynolds number ranges from 2000 to 12000. The roughness has relative rib height of 0.045, ratio of dimple depth to print diameter of 0.5 and rib pitch ratio of 8.0. The flow attack angle is varied from $35^{\circ}$ to $70^{\circ}$. Various turbulent flow models are used for the heat transfer and fluid flow analysis and their results are compared with the experimental results for smooth surfaces. The computational fluid dynamics (CFD) results based on the renormalization k-epsilon model are in better outcomes compared with the experimental data. This model is used to calculate heat transfer and fluid flow in SAH duct with the compound roughness of V-shaped ribs and dimples. The overall thermal performance based on equal pumping power is found to be the highest (2.18) for flow attack angle of $55^{\circ}$. The thermo-hydraulic performance for V-pattern shaped ribs combined with dimple ribs is higher than that for dimple rib shape and V-pattern rib shape air duct.
Keywords
CFD, Computational fluid dynamics; SAH, Solar air heater; Flow attack angle; Heat transfer enhancement; Overall thermal performance; Roughness of V-shaped ribs and dimples;
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Times Cited By KSCI : 1  (Citation Analysis)
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