Abstract
A two-dimensional computational fluid dynamics (CFD) analysis of the artificially roughened solar air heater rectangular duct with three different types of vortex generators (rectangular, triangular, and circular) on the absorber plate is conducted in order to increase the transfer of heat in the flow. ANSYS FLUENT 16.0 is used as a solver to determine the nature of flow in the solar air heater duct having vortex generators using finite element method with the SIMPLE algorithm as a base. The variation of average Nusselt number was investigated with the change in Reynolds number ranging from 3800–18,000 and with the constant heat flux of 1100 W/m2. The research has found that the average Nusselt number was considerably increased with every range of Reynolds number in all the geometries but most significantly increased in triangular vortex generator with negligible pressure drop. The value of average Nusselt number found in triangular vortex generator at Reynolds number 18,000 was 3.848 times to that of average Nusselt number of the smooth duct at same Reynolds number. The thermo-hydraulic performance and enhancement ratio of Nusselt number is also studied and found to be the best for the duct with triangular vortex generator at Reynolds number 3800.
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