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Open AccessArticle10.1299/kikaib.57.1403

Unsteady flow and heat transfer in a channel obstructed by a square rod. 3rd Report. Characteristics and mechanism of heat transfer.

Hiroshi Suzuki,Kenjiro Suzuki,Yoshiaki Inoue,Yoshimichi Hagiwara-1991-01-01-TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
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Two-dimensional numerical computation has been made for unsteady velocity and thermal fields realized in the channel obstructed by an inserted square rod. The previous papers were devoted to the discussion of the obtained velocity fields. The present paper deals with the thermal field and wall heat transfer. The streamwise distribution of time-mean local Nusselt number reveals that heat transfer is augmented by the flow unsteadiness in the region downstream from the rod. Its peak at x/H=1.6 is caused by the peak of instantaneous Nusselt number, which first appears at x/H=0.8 and moves downstream accompanying the value of peak height. At this peak position, instantaneous wall shear stress takes the value lower than its time-mean value. Therefore, dissimilarity between the heat transfer and the momentum transfer exists there instantaneously. The peak position also corresponds to the position inside a wall vortex. Above this wall vortex, another isolated vortex, which is a disconnected to

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Two-dimensional numerical computation has been made for unsteady velocity and thermal fields realized in the channel obstructed by an inserted square rod. The previous papers were devoted to the discussion of the obtained velocity fields. The present paper deals with the thermal field and wall heat transfer. The streamwise distribution of time-mean local Nusselt number reveals that heat transfer is augmented by the flow unsteadiness in the region downstream from the rod. Its peak at x/H=1.6 is caused by the peak of instantaneous Nusselt number, which first appears at x/H=0.8 and moves downstream accompanying the value of peak height. At this peak position, instantaneous wall shear stress takes the value lower than its time-mean value. Therefore, dissimilarity between the heat transfer and the momentum transfer exists there instantaneously. The peak position also corresponds to the position inside a wall vortex. Above this wall vortex, another isolated vortex, which is a disconnected to

Keywords

Nusselt numberMechanicsVortexHeat transferHeat transfer enhancementVortex sheddingPhysicsClassical mechanics

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