Temperature analysis for the horizontal target cooling with non-confined and inclined air jet

Abstract

In jet impingement cooling applications, the inclined jet in non-confined condition; also called as submerged jet is experimentally investigated. The objective is to analyze for hot surface cooling applications. Air is used as the working fluid, by using placement of jet on the leading edge of a horizontal rectangular target plate at height H, and examined for downhill side comprehensive cooling performance approach. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20000 is investigated with circular jet for inclination of 15° ≤ θa ≤ 75°. The effect of jet to target distance (H) is also investigated in the range 0.5 ≤ H⁄D ≤ 6.8. The temperature variation at the center line of target is studied with analysis of temperature profile. Its variation with respective to horizontal distance of jet from leading edge (X) and counters are plotted for jet diameter (D) of 16mm. The location of minimum temperature during cooling by jet impingement, goes to downhill side for jet impingement with an angle of 75, 60, 45, 30 and 15°. Cooling is observed to be increase up to X⁄D = 5, and then it declines. The cold spot is seen at (X⁄D) of around 5 to 7 except at high Reynolds number. The impact of jet inclination is more on temperature variation of flat target, compared to other parameters.