An Investigation of Convective Cooling of an Array of Channel-Mounted Obstacles

Abstract

A numerical investigation of forced convective cooling of an array of obstacles was performed to synthesize the effects of various pertinent parameters on the cooling performance. Reynolds number, channel clearance height-to-element length ratio, spacing-to-channel height ratio, geometric ratio of the blocks, and total number of obstacles were varied to estimate their influence on the cooling process. Two generalized sets of Nusselt number correlations were developed for the obstacles in the channel based on a very large number of computational simulations. The numerical data match the correlation equations quite well.

Enhancement of Heat Transfer of Mixing Convection in a Vertical Channel by a Moving Block

“…It is well-known methods of enlargement of heat dissipation surface [9][10][11][12][13], disturbance of flow field [14][15][16][17][18][19] and vibration of heat surface [20][21][22][23] are most usually applied to enhance heat transfer rate of the channel flow and the results of the above methods are remarkable and available. Due to the speedy formation of thermal boundary layer along the flow direction, the heat transfer rate of the above methods seems to only have a superior heat transfer rate in the upstream region.…”

Enhancement of forced convection heat transfer in a three-dimensional laminar channel flow with insertion of a moving block

“…At present well-known methods of the enlargement of heat dissipation surface [3][4][5][6][7][8][9][10][11], the disturbance of flow field [12][13][14][15][16][17][18][19] and the vibration of heat surface [20][21][22][23][24][25][26] are most usually adopted to enhance the forced convection heat transfer rate of the channel flow and the results of the above methods are remarkable and available. However, the increment of the heat transfer rate of the above methods seems to have limitation because a thermal boundary layer which is disadvantageous to heat transfer mechanisms still forms on the heat surface.…”

An analysis of flow and heat transfer in separated flows over blocked surface

“…Many investigations of the blocked surface have been carried out to provide information concerning effects of the free stream velocity and geometric parameters on separated flow and heat transfer. A numerical investigation of forced convective cooling of an array of obstacles was performed to synthesize the effects of various parameters on the cooling performance by Zeng and Vafai, 1 and they developed two empirical correlations for Nusselt numbers. Miyake et al 2,3 carried out two numerical studies on the turbulent flow in channels with rib-roughened wall, and offered that the major effect of the roughness element was to enhance the turbulent mixing and heat exchange.…”