CFD simulation of solar air heater using artificial wavy roughness
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Date
2018-11
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In the present work, Computational Fluid Dynamics (CFD) analysis of solar air heater having artificial wavy roughness has been performed. Ansys FLUENT software is used as a simulation tool for CFD analysis. Twelve different configurations of the wavy surface having rib height (e) 0.7 mm, 1 mm and 1.4 mm and pitch (p) of 10, 15, 20 and 25 mm have been considered as roughness element. A two-dimensional computational domain is modelled and the involved differential equations are solved using a finite volume method. The RNG k-ε turbulence model with enhanced wall function is used to solve the transport equations for turbulent flow and energy dissipation rate. Effect of roughness parameter on Nusselt number, friction factor, and thermo-hydraulic performance parameter are studied for uniform heat flux of 1000 W/m2. The optimal values of geometric parameters are obtained on the basis of the thermo-hydraulic performance parameter in the range of the Reynolds number from 3800 to 18000. Optimum thermo-hydraulic performance parameter is found to be 1.96 corresponding to the rib height of 0.7 mm and pitch 15 mm at Reynolds number of 12000.
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