Computational Study of Slot Jet Impingement Heat Transfer on a Combined Dimpled and Protruded Concave Surface

Abstract

Numerical simulations are performed to explore heat transfer characteristics of jet impingement on dimpled and protruded concave surface. Many researchers have found that protrusions and dimples act as turbulent promoters which enhance jet impingement cooling. The protrusions increase the weight whereas dimples increase the stress. Therefore, proper combination and arrangement of dimples and protrusions are necessary to enhance impingement heat transfer. In the present study, a constant temperature of 335 K is applied at the backside of a concave surface while the top surface is cooled by impinging air. Calculations are done for various combinations and arrangement of dimples and protrusions of different dimensions over a concave surface. It is observed that a particular arrangement of dimples and protrusions lead to high augmentation in heat transfer compared to dimples or protrusions alone. Also, the higher dimension of dimples/protrusions degrades impingement heat transfer.