Heat transfer from a finned surface in ducted air jet suction andimpingement

Experimental measurement were obtained to characterize thethermal performance of ducted air suction in conjunction with a pin-fin heat sink. Four single nozzles of afferent diameters andtwo multiple-nozzie arrays were studied at a fixed nozzle-to-targetdistance, for different turbulent Reynold: numbers (5000≤Re≤20,000). Variations of nozzle-to-tar get distance, i.e., open area, in ducted suction were fund to hone a strong effect on heat trans-fer especially with the larger diameter single nozzle and both multiple-nozzie arrays. Enhancement factors were computed withthe heat sink in suction flow, relative to a bare surface, and werein the range of 8.3 to 17.7. with the largest value being obtainedfor the nine-nozzle array. Results from the present srudy on air jetsuction are compared wish previous experiments with air jet im-pingement on the pin-fin heat sink Average heat transfer coeffi-cient and thermal resistance values are reported fir the heat sink as a function of Reynolds number, air flow rate, and pumping power.