Effect of artificial roughness on heat transfer and friction factor in a solar air heater

Journal Article · Thu Dec 31 23:00:00 EST 1987 · Solar Energy; (USA)

DOI:https://doi.org/10.1016/0038-092X(88)90058-8· OSTI ID:5331547

Prasad, B N; Saini, J S ^[1]

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1. Univ. of Roorkee (India)

Convective heat transfer coefficient between absorber plate and air in a flat-plate solar air heater can be enhanced by providing the absorber plate with artificial roughness. An investigation of fully developed turbulent flow in a solar air heater duct with small diameter protrusion wires on the absorber plate has been carried out and expressions for prediction of average Stanton number and average friction factor have been developed. The results of these expressions have been compared with available data. The results have been found to compare with a mean deviation of 6.3% for friction factor and {minus}10.7% for the Nusselt number. The effect of height and pitch of the roughness elements on the heat transfer rate and friction has also been investigated.

• OSTI ID: 5331547
• Journal Information: Solar Energy; (USA), Journal Name: Solar Energy; (USA) Vol. 41:6; ISSN SRENA; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140000* -- Solar Energy
AIR HEATERS
DATA
EFFICIENCY
ENERGY TRANSFER
EQUIPMENT
EXPERIMENTAL DATA
FLAT PLATE COLLECTORS
FLUID FLOW
FRICTION FACTOR
HEAT TRANSFER
HEATERS
INFORMATION
NUMERICAL DATA
PERFORMANCE
SOLAR AIR HEATERS
SOLAR COLLECTORS
SOLAR EQUIPMENT
TURBULENT FLOW