Computational Study of Mist Jet Impingement Heat Transfer on a Flat Plate with Slotted Nozzle

The work presents the numerical investigation of a slot mist jet impingement cooling on an isothermal flat plate surface at three different temperatures 323, 350 and 363 K. A two-dimensional model was analyzed with mist (air and water) as working fluid. The distance from nozzle exit to the surface of the heated plate is varied from h/S = 4 and 8. The numerical analysis was carried out for jet Reynolds number Re-s = 2750 varying the volume fraction, vof 1-10% and size of droplet from 1 to 300 micron. Addition of mist causes significant increase of heat transfer coefficient as compared to the single-phase heat transfer coefficient. The numerical result of local heat transfer coefficient is compared with the experimental results of Gardon and Akfirat [1]. Also, the effect of heat transfer coefficient varying the distance from nozzle to plate spacing is shown. The turbulence models k - epsilon and k - omega SST were considered for the study, and their differences are also presented.