Applied and Natural Science Foundation
Its publication:
Journal of Applied and Natural Science
An International Journal | Print ISSN: 0974-9411 | Online ISSN: 2231-5209
NAAS RATING 5.08
Sign up for free registration!
Already registered Log in
*Email Id  
*Password
Submit
[Forgot Password]
         
Abstract
Journal of Applied and Natural Science 8 (1): 251-256 (2016)
Effect of rib roughness pitch on thermal and thermo-hydraulic performance of a solar air heater roughened artificially with arc rib having gap
V. S. Hans1, R. S. Gill2* and Rupinderpal Singh2
1School of Energy Studies for Agriculture, Punjab Agricultural University, Ludhiana (PB.), INDIA
2Department of Mechanical Engineering, Punjab Agricultural University, Ludhiana (PB.), INDIA
* Corresponding author. E-mail: rsgill@pau.edu
Abstract : This experimental study on a solar air heater having absorber plate roughened artificially by providing roughness in the form of arc ribs having gap was carried out in the Department of Mechanical Engineering, Punjab Agricultural University, Ludhiana, India to study the effect of relative roughness pitch on thermal and thermohydraulic performance as well as to compare the performance of arc rib with gap roughened solar air heater with that of continuous arc rib roughened solar air heater. The roughness geometry parameters included relative roughness height of 0.043, angle of attack of 30 degree, relative gap position of 0.80, gap-width equal to the width of the rib and five values of relative roughness pitch ranging from 4 to 12 for flow Reynolds number range of 2000 to 16,000. The Nusselt number and friction factor were found to be more for relative roughness pitch value of 10 as compared to other values of relative roughness pitch. Thermo-hydraulic performance of solar air heaters roughened by arc with gap and continuous arc roughness geometries were found to be 1.91 times and 1.78 times respectively as compared to that of solar air heater having smooth absorber plate due to generation of turbulence in laminar sublayer region. However, improvement in thermo-hydraulic performance of solar air heater roughened by arc with gap geometry over continuous arc rib roughened solar air heater was attributed to generation of a region of turbulence on downstream side of the gap.

Keywords : Artificial roughness, Reynolds number, Solar air heater, Thermal performance, Thermo-hydraulic performance
Back
Bookmark and Share
Home | Admin Panel | Sitemap | Feedback | FAQ
© Copyright 2009-2016. All Rights Reserved. Designed & Maintained by www.apvtechnologies.com