CFD Analysis of Heat Transfer through Artificially Roughened Solar Duct

CFD Analysis of Heat Transfer through Artificially Roughened Solar Duct

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2013 by IJETT Journal
Volume-4 Issue-9                      
Year of Publication : 2013
Authors : Suman Saurav , V.N.Bartaria

Citation 

Suman Saurav , V.N.Bartaria. "CFD Analysis of Heat Transfer through Artificially Roughened Solar Duct". International Journal of Engineering Trends and Technology (IJETT). V4(9):3936-3944 Sep 2013. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group.

Abstract

The thermal performance of solar air heater is generally poor due to low heat transfer coefficient between the absorber plate and air flowing in the duct. In order to improve the thermal performance artificial roughness is provided on the underside of a bsorber plate due to which turbulence is created in the heat transfer zone and ultimately performance of solar air heater improves considerably. This paper presents the study of heat transfer in a rectangular duct of a solar air heater having triangular ri b roughness on the absorber plate by using Computational Fluid Dynamics (CFD). The effect of Reynolds number on Nusselt number was investigated to study the heat transfer, friction factor and flow characteristics in a solar air heater having triangular rib roughness on the absorber plate. The computations based on the finite volume method with the SIMPLE algorithm have been conducted for the air flow in terms of Reynolds numbers ranging from 4000 – 20000 and p/e (4 to 20) has been carried out with k - ? turbu lence model is selected by comparing the predictions of different turbulence models with experimental results available in various literature. In present work computational fluid dynamics software (Fluent 6.3 Solver) has been used for simulation. Fluid flo w (FLUENT) module has been used in present work. Fluid flow (FLUENT) module predicts the outlet temperature, velocity, flow behavior to great accuracy due to application of thermal loading on the work piece. It has been found that the nusselt number increa ses with increase in Reynolds number. Maximum value of nusselt number friction factor is obtained at relative roughness pitch of 4.

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Keywords
Artificial roughness, Solar air heater, Roughness geometry, Nusselt number, Friction factor, Thermo hydraulic performance, Reynolds number.