Heat Transfer in Rotating Rectangular Channels with V-Shaped and Angled Ribs
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An experimental study was performed to measure the regionally averaged heat-transfer distributions in a rotating ribbed channel with an aspect ratio of 4:1. The Reynolds number, based on hydraulic diameter, varies from 5 × 103to 40 × 103. The rotation number ranges from 0 to 0.3, and the inlet coolant-to-wall density ratio (Δp/p) is maintained around 0.122. Six different configurations of ribs, oriented at an angle of 45 deg to the direction of flow, are placed on both the leading and trailing surfaces: 1) parallel V-shaped ribs without gaps, 2) staggered V-shaped ribs without gaps, 3) parallel V-shaped ribs with gaps, 4) parallel angled ribs without gaps, 5) staggered angled ribs without gaps, and 6) parallel angled ribs with gaps. The rib-height-to-hydraulic-diameter ratio (e/Dh) is 0.078, and the rib-pitch-to-height ratio (P/e) is 10. The channel orientation with respect to the plane of rotation is 135 deg. The results show that the V-shaped rib configuration produces more heat-transfer enhancement than the angled rib configurations. It is also shown that there is only a negligible difference between the heat-transfer enhancement due to the staggered V-shaped ribs without gaps and the enhancement due to the parallel V-shaped ribs without gaps. The same is true for the staggered and parallel angled ribs without gaps. Also, the parallel V-shaped ribs without gaps produce more heat-transfer enhancement than the V-shaped ribs with gaps, whereas the parallel angled ribs with gaps produce more heat-transfer enhancement than the angled ribs without gaps. Finally, rotation further increases the heat transfer from all surfaces above that of the stationary channels.
author list (cited authors)
Lee, E., Wright, L. M., & Han, J.