Correlations for solar air heater duct with V-shaped perforated baffles as roughness elements on absorber plate

An experimental investigation has been carried out to study the effect of heat transfer and friction characteristics of air passing through a rectangular duct which is roughened by V-down perforated baffles. The experiment encompassed Reynolds number (Re) from 3800 to 19,000, relative roughness heig...

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Bibliographic Details
Published in:International journal of sustainable energy 2016-01, Vol.35 (1), p.1-20
Main Authors: Chamoli, Sunil, Thakur, N.S.
Format: Article
Language:English
Subjects:
Baffles
Correlation analysis
Ducts
Ductwork
Fluid dynamics
Fluid flow
Friction
Friction factor
Heat transfer
Heaters
Nusselt number
open area ratio
perforated baffles
Reynolds number
Roughness
V-down
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Summary:An experimental investigation has been carried out to study the effect of heat transfer and friction characteristics of air passing through a rectangular duct which is roughened by V-down perforated baffles. The experiment encompassed Reynolds number (Re) from 3800 to 19,000, relative roughness height (e/H) values of 0.285-0.6, relative roughness pitch (P/e) range of 1-4 and open area ratio values from 12% to 44%. The effect of roughness parameters on Nusselt number (Nu) and friction factor (f) has been determined and increase in heat transfer and friction loss has been observed for ducts having a roughened test plate. Maximum Nusselt number is observed for the relative roughness pitch ranging from 1.5 to 3 for flow and geometrical parameters under consideration. The experimental data have been used to develop Nusselt number and friction factor correlations as a function of roughness and flow parameters.
ISSN:1478-6451
1478-646X
DOI:10.1080/14786451.2013.857318