Computational Fluid Dynamics of Solar Air Heater Duct Roughened with Multiple Arc Rib having Gap and Staggered Rib Piece
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Artificial roughening of solar air heater duct wall is the effective method which leads to significant enhancement in heat transfer as well comparable rise in friction losses. The different investigations have been performed by various authors to study the heat transfer rate and friction factor characteristics. In this present study, a numerical investigation is carried out using Computational Fluid Dynamics software ANSYS Academic Research CFD 15.0 to determine the heat transfer rate and thermo-hydraulic performance of rectangular solar air heater duct roughened with multiple arc rib having gap and staggered rib piece. The parameters considered were relative roughness pitch of 8, relative roughness height of 0.043, relative roughness width of 5, relative gap width of 1, arc angle of 60° and relative staggered rib size of 4. The investigation encompassed for the Reynolds number and relative staggered rib pitch range from 2000 to 18000 and 0.2 to 0.8 (4values) respectively. The maximum enhancement in Nusselt number and friction factor was observed to be 3.38 and 6.2 times as compared to smooth duct at relative staggered rib pitch of 0.4. The maximum thermo-hydraulic performance found to be 1.83 for relative staggered rib pitch of 0.4 at Reynolds number of 12000.
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