Heat transfer and fluid flow analysis of an artificially roughened solar air heater: a CFD based investigation

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• 作者：Anil Singh Yadav (1) (2)
  J. L. Bhagoria (2)
  
• 关键词：heat transfer ; pressure drop ; thermo ; hydraulic performance parameter
• 刊名：Frontiers in Energy
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：8
• 期：2
• 页码：201-211
• 全文大小：
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• 作者单位：Anil Singh Yadav (1) (2)
  J. L. Bhagoria (2)
  
  1. Mechanical Engineering Department, Technocrats Institute of Technology-Excellence, Bhopal, MP, 462021, India
  2. Mechanical Engineering Department, Maulana Azad National Institute of Technology, Bhopal, MP, 462051, India
  
• ISSN：2095-1698

文摘

In this paper, the effect of rib (circular sectioned) spacing on average Nusselt number and friction factor in an artificially roughened solar air heater (duct aspect ratio, AR = 5:1) is studied by adopting the computational fluid dynamics (CFD) approach. Numerical solutions are obtained using commercial software ANSYS FLUENT v12.1. The computations based on the finite volume method with the semi-implicit method for pressure-linked equations (SIMPLE) algorithm have been conducted. Circular sectioned transverse ribs are applied at the underside of the top of the duct, i.e., on the absorber plate. The rib-height-to-hydraulic diameter ratio (e/D) is 0.042. The rib-pitch-to-rib-height (P/e) ratios studied are 7.14, 10.71, 14.29 and 17.86. For each rib spacing simulations are executed at six different relevant Reynolds numbers from 3800 to 18000. The thermo-hydraulic performance parameter for P/e = 10.71 is found to be the best for the investigated range of parameters at a Reynolds number of 15000.