A computational study on natural convection heat transfer from an inclined plate finned channel. (August 2019)

• Record Type: Journal Article
• Authors: Roy, Krishna; Giri, Asis; Das, Biplab
• Is Part Of: Applied thermal engineering. Volume 159(2019)
• Publication Date: 2019-08
• Subjects: Inclined channel -- Natural convection -- Fin conductivity -- Nusselt number -- Induced velocity; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2019.113941
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Inclined plate finned channel is performed for variable property fluid. Boussineśq assumption estimate 4–8% higher heat transfer. Increase in fin conductivity from 75 to 150 W/(m K) heat transfer enhance by 14% Increase in clearance from 0.1% to 0.5%, 20% enhancement in heat transfer observed. Inclination 60° provides 60% higher heat transfer than at 30°. Abstract: In this work, a numerical study on the natural convection heat transfer phenomenon from an inclined plate finned channel is performed for variable property fluid. Computations are performed for a range of parameters including dimensionless fin spacing ( S * ) = 0.3 and 0.5, dimensionless clearance ( C * ) = 0.10–0.50, fin height ( H ) of 0.03 and 0.04, and angle of inclination ( θ ) = 30°, 45°, and 60°. For all the values of θ, a decrease in the maximum average pressure ( P * ) is observed with the increase in clearance. Boussinésq fluid with constant properties predicts the heat transfer phenomenon higher by 15% than variable fluid properties, at the highest value of θ. It is also found that the induced velocity ( Win ) increases nearly by 100% with the rise in angle of inclination from 30° to 60°. Increase in the fin conductivity ( k ) from 75 to 150 W/(m K) enhance the heat transfer by 14%. An initial increase in C * value from 0.1 to 0.25–0.4, a maximum of 20% enhancement in heat transfer rate is observed, however, a further increase deteriorates the heat transfer. The highest value of the Nusselt number is observed at θ = 60°, which is about 40% and 60% higher than those observed at θ = 45° and θ = 30°, respectively.