Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Heat Transfer Measurement of Confined Multiple Impinging Slot Jets without Cross-Flow Effects

Get access (open in a dialog) DOI: 10.1615/IHTC12.2150
6 pages

Abstrakt

An experimental study of the heat transfer between confined multiple impinging slot jets and a flat surface is presented in this paper. In the experimental apparatus,the exhaust ports between neighboring jets were manufactured to recover the spent flow so that to eliminate the cross flow effects, which degrade the heat transfer of the downstream impinging jets. The slot width is fixed at 2.5 mm, with a spanwise length of 360 mm. The Reynolds number at the nozzle exit ranges from 1 150 to 7 500,and the nozzle-to-plate distance is varied between 4,8,16 and 24 in the experiments.
Liquid crystal thermography is employed to reveal temperature distributions on the test plate,because of its ability to map the thermal field. Local heat transfer coefficients are obtained,and then the average heat transfer coefficients are evaluated. The heat transfer results of the single slot jet and the central jet of the three slot array are compared to reveal the flow interaction. The spent fluid removal diminishes the influences of the cross flow, and the heat transfer rates are enhanced compared with the multiple impinging slot jets with cross flow effects.