2. LITERATURE REVIEW Kuethe et al. [1] was the first suggest the use of dimple surface for heat transfer Enhancement. Surface dimples are expected to promote turbulent mixing in the flow and Enhance the heat transfer, as they behave as a vortex generator. M. A. Dafedaret. al. [2] studied experimentally the heat transfer augmentation through various geometries of dimpled surfaces in longitudinal and lateral directions. In his paper horizontal
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