Abstract
In the present study it is found that enhancement of air turbulent flow and heat transfer at Re=104 is influenced by a set of one-row oval-trench dimples of depth 0.25 inclined at an angle of 65° to the incoming flow and located at the heated wall of the rectangular (9×1) narrow channel when the dimple step H is varied. The periodic section of the dimpled channel 8 in length is considered. The dimple step H is varied from 8 to 2. Abnormal enhancement of flow and heat transfer at H=2 is followed by both a 4-fold decrease in relative negative friction and a 6.5-fold increase in relative heat transfer in the separated flow zone. The phenomenon of turbulent flow acceleration with a 1.39-fold increase in the maximum flow velocity (at H=2) in the dimpled narrow channel in comparison to the plane-parallel channel is discovered.
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