EXPERIMENTAL STUDY OF MIST JET IMPINGEMENT COOLING

In this paper, an experimental study of mist jet impingement cooling over a heated flat surface is performed to identify the effect of Reynolds number, nozzle-to-plate spacing, and mist loading fraction. The parametric experiments were performed for Reynolds numbers ranging from 10,000 to 40,000, nondimensional nozzle-to-plate spacing of 32-56, and loading fraction ranging from 0 to 1%. The present study indicated that the Reynolds number (Re-dhyd) and the loading fraction (f) increases the Nusselt number, whereas increasing the hid ratio adversely affects the cooling. It is concluded that the loading fraction has the highest impact on the cooling controllability, while the Reynolds number and the hid ratio have a secondary and tertiary impact on the cooling. Furthermore, based on the experimental results, a correlation function is developed. It is elucidated that a good correlation function can act as a better alternative over costly and prolonged experiments.