Abstract

A 3-dimensional CFD analysis has been carried out of solar air heater to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having combination of circular and square transverse wire rib roughness. The effect of Reynolds number, roughness height, roughness pitch, relative roughness pitch and relative roughness height on the heat transfer coefficient and friction factor have been studied. In order to validate the present numerical model, results have been compared with available experimental results under similar flow conditions. CFD Investigation has been carried out in medium Reynolds number flow.Average Nusselt number increases with an increase of Reynolds number. The maximum value of average Nusselt number is found to be 128.9646 for relative roughness pitch of 20mm and for relative roughness height of 0.06mm at a higher Reynolds number, 14000. Average friction factor decreases with an increase of Reynolds number. The range of parameters for this study has been decided on the basis of practical consideration of the system and operating conditions. The experiment has covered a Reynolds number Re range of 6000-16000, Relative roughness pitch P e of 8, 10 and 12. Relative angle of attack a 90 =0.3333. Results have been compared with the heated plate without roughness and with the earlier reported inclined rib under similar flow condition to determine the enhancement in heat transfer coefficient and friction factor. Ajay Jain | Prof. H. S. Sahu "CFD Analysis of Solar Air Heater for Enhancenment of Heat Transfer Through Inclined Rib Roughness" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-1 , December 2018, URL: http://www.ijtsrd.com/papers/ijtsrd19057.pdf Direct URL: http://www.ijtsrd.com/engineering/mechanical-engineering/19057/cfd-analysis-of-solar-air-heater-for-enhancenment-of-heat-transfer-through-inclined-rib-roughness/ajay-jain

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