Abstract
Detached ribs are one of the surface roughners for heat transfer augmentation. The mounts provided under the detachable rib act as a turbulator and assist in additional heat transfer augmentation. The influence of number of mounts under the detachable rib on heat transfer augmentation is investigated experimentally by varying nozzle to surface distance (z/d = 0.5 to 6) for jet Reynolds number of 20000. The heat transfer characteristics is determined by IR thermal imaging and thin foil method. At stagnation region, detachable rib design resulted constant enhancement in heat transfer distribution in comparison to the results of smooth flat surface. At z/d = 0.5, the enhancements of around 43%, 53% and 58% in average Nusselt numbers are observed for fully detached rib, detached rib with 4 mounts and 6 mounts when compared with smooth flat surface. For lower value of nozzle to surface distance (z/d = 0.5), the augmentation in average Nusselt numbers are effective for detachable rib with 6 mounts due to higher turbulence intensity as a consequence of mixing caused by flow recirculation and counter spinning vortex formation behind the mounts.
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