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research-article

Performance Investigation of Triangular Solar Air Heater Duct having Broken Inclined Roughness using Computational Fluid Dynamics

[+] Author and Article Information
Sheetal Kumar Jain

JLN MARG JAIPUR, Rajasthan 302017 India sheetaljain91@gmail.com

Rohit Misra

NH-8, Barliya Chouraha Ajmer, 302025 India rohiteca@rediffmail.com

Prateek Verma

NH-8, Barliya Chouraha Ajmer AJMER, 305001 India prateek.ver24@gmail.com

Sanjay Rathore

NH-8, Barliya Chouraha Ajmer AJMER, RAJASTHAN 305001 India rathoresanjay1810@gmail.com

Doraj Kamal Jamuwa

NH-8 BARLIYA CIRCLE AJMER, 305001 Ireland kdoraj@yahoo.com

Ghanshyam Das Agrawal

Jawahar Lal Nehru Marg jaipur Jaipur, 302019 India gdagrawal2@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received February 22, 2019; final manuscript received May 6, 2019; published online xx xx, xxxx. Assoc. Editor: M. Keith Sharp.

ASME doi:10.1115/1.4043751 History: Received February 22, 2019; Accepted May 10, 2019

Abstract

Large scale adaptation of solar air heating in industries and agro-processing will lead to clean energy processing as well as reducing the production cost for these industries. Solar air heater uses the principle of greenhouse effect to heat air through the collected heat in the absorber. Among the various techniques employed by the researchers to augment the heat transfer, the addition of artificial roughness elements/fins/corrugations on the heated surface is the promising one for heat transfer augmentation. In the present work, the effect of broken inclined ribs with rectangular cross-section on heat transfer and friction characteristics of equilateral triangular passage duct has been analyzed using computational fluid dynamics. The effect of roughness parameters, viz., relative gap position and relative gap width is being investigated for the Reynolds number (Re) ranging from 4000 to 18000. The values of relative gap position (d/W) and relative gap width (g/e) are varied from 0.16 to 0.67 and 0.5 to 2, respectively while a constant heat flux is supplied on absorber side, other surfaces being insulated. The Nusselt number increased up to 2.16 times by using broken ribs than that of smooth duct at d/W = 0.25 and g/e = 1.

Copyright © 2019 by ASME
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