The focus of the study was the conjugate heat transfer during impingement of a confined liquid jet. Two numerical models of a heat transfer process with heat transmission through a fluid-solid interface have been developed. In the first case only the fluid region has been considered while in the second case the solid region has been modeled along with the fluid region as a conjugate problem. The inlet nozzle Reynolds number has been kept at values where laminar flow can be assumed in all cases. The solid-fluid interface temperature shows a strong dependence on several geometric, fluid flow, and heat transfer parameters. The Nusselt number increased with Reynolds number. For a given flow rate, a higher heat transfer coefficient was obtained with smaller slot width and lower impingement height. A higher heat transfer coefficient at the impingement location was seen at a smaller thickness, whereas a thicker plate provided a more uniform distribution of heat transfer coefficient. Compared to Mil-7808 and FC-77, ammonia provided much smaller solid-fluid interface temperature and higher heat transfer coefficient.

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