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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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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container_title International journal of sustainable energy
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creator Chamoli, Sunil
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description 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.
doi_str_mv 10.1080/14786451.2013.857318
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source Taylor and Francis Science and Technology Collection
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
title Correlations for solar air heater duct with V-shaped perforated baffles as roughness elements on absorber plate
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