Journal
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
Volume 38, Issue 2, Pages 643-663Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40430-015-0402-9
Keywords
CFD; Chamfered square ribs; Solar air heater; Artificial roughness; Thermo-hydraulic performance parameter; Friction factor
Categories
Ask authors/readers for more resources
An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a solar air heater has been carried out using chamfered square rib as artificial roughness on the absorber plate. The relative roughness pitch (P/e = 7.14-17.86), chamfer angle (alpha = 0 degrees-40 degrees), Reynolds number (Re = 3800-18,000) and relative roughness height (e/D = 0.042) are chosen as design variables for analysis. A uniform heat flux of 1000 W/m(2) is maintained on the surface of absorber plate. CFD code, ANSYS FLUENT 14.5 with renormalization group k-epsilon model was chosen. An enhancement in Nusselt number and friction factor with decrease in relative roughness pitch (P/e) is presented and discussed with reference to experimental and CFD analysis. The effect of chamfer angle and Reynolds number on enhancement of Nusselt number and friction factor is also presented. Optimum configuration of roughness element for artificially roughened solar air heater has been determined in terms of thermo-hydraulic performance parameter. The chamfer angle of 20 degrees on square rib and relative roughness pitch of 7.14 provide best thermo-hydraulic performance of 2.047 considering the maximum heat transfer and minimum pressure drop.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available