Numerical studies of the multiple-jet impingement and internal cooling of small confined space with exit slots

The heat transfer and pressure loss in the multiple-jet impingement and internal cooling of small confined space with exit slots are studied in this paper. Flow visualization studies are also carried out for such flow fields. Eleven cases are studied for the stream function, internal flow pressure distribution, the local and the average coefficients of heat transfer on the upper and lower surfaces of the small confined space. Geometric parameters are varied in the following ranges, H/b=1,2 and 4, L/b=2,4 and 8. The Reynolds numbers used in the analysis are 200, 377 and 650, respectively. The maximum values of the local flow resistances are found in the vicinity of the exit slots where the pressure drop is quite large. The total flow resistance increases by a factor of 3 when the H/b value decreases from 2 to 1. The L/b value seems to have stronger effect on flow resistance in certain range of flow parameters. The average coefficient of heat transfer and the stagnation point heat transfer coefficient are evaluated at different H/b and L/b values. An equation of average Nusselt number is suggested for design purpose