Heat Transfer and Friction Characteristics of Solar Air Heater Duct Roughened by Broken Arc Shaped Ribs Combined with Staggered Rib Piece

R S Gill, V S Hans, J S Saini
2015 International Journal of Engineering Research and  
In this paper, results of experimental investigation on heat transfer and friction in rectangular ducts roughened with broken arc-rib roughness combined with staggered rib piece has been presented. The rib roughness has relative gap position of 0.65, relative staggered rib position of 0.6, relative staggered rib size of 2.0, relative roughness pitch of 10, arc angle of 30° and relative roughness height of 0.043. The relative gap size was varied from 0.5 to 2.5. The effects of gap size on
more » ... gap size on Nusselt number, friction factor and thermo-hydraulic performance parameter have been discussed and results compared with smooth duct and continuous arc rib roughened duct under similar conditions.
doi:10.17577/ijertv4is110607 fatcat:kveh5ifscjb77ac3xrqhimqwcq