Single-phase and two-phase heat transfer during confined impingement of single jets and jet arrays.

摘要

Single- and two-phase heat transfer during jet impingement of a perfluorinated dielectric liquid, FC-72, on a silicon test chip is experimentally investigated. Integrated heaters and temperature-sensing diodes in the test chip provide precise heat flux control and local temperature measurements, respectively. A test section is custom-built to determine the effects of nozzle diameter, number of nozzles, ratio of nozzle separation from the surface to nozzle diameter (H/D), and Reynolds number. The number of nozzles investigated ranges from 1 to 121, nozzle diameter ranges from 0.4 mm to 3 mm, and the spacing ratio H/D from 1 to 4. The best performing test case was the 9 x 9 array with D = 0.4 mm and Re = 2000, which was able to dissipate 118 W/cm 2 of heat flux during nucleate boiling. Experimental results for single-phase and two-phase heat transfer are compared to predictions from correlations in the literature and show good agreement.