“An investigation of Heat transfer and fluid flow analysis of an artificially roughness of solar air heater with combination of triangular and pantagon ribs on the absorber plate based on CFD (Computational fluid dynamics)”
This article presents the numerical investigation of an artificially roughened solar air heater having combination of triangular and pentagon transverse ribs on the absorber plate by using computational fluid dynamics (CFD). The effects of small diameter of transverse wire rib roughness on heat transfer and fluid flow have been investigated. The input parameters for the analysis are taken as Reynolds number (Re), relative roughness pitches (P/e) and relative roughness height (e/D) are chosen as design variables. A 3-Dimensional CFD simulation is performed using the ANSYS FLUENT 14.5 code with Renormalization-group (RNG) k-ε turbulence model is selected as the most appropriate one. It is apparent that the turbulence created by small diameter of transverse wire ribs result in greater increase in heat transfer over the duct. Due to artificial roughness heat transfer increase as compared to the smooth duct. The present CFD investigation shows the effect of input design parameter on various thermal properties like Nusselt number, average friction factor and thermo hydraulic performance parameter. The condition for optimum performance has been determined in term of heat transfer coefficient. A maximum value of heat transfer has been found to be 34.35154 w/m2k and thermo-hydraulic performance 1.163 for the range of parameters investigated.
Article Details
Unique Paper ID: 150495

Publication Volume & Issue: Volume 7, Issue 7

Page(s): 7 - 14
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Volume 8 Issue 4

Last Date 25 September 2021

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