HEAT TRANSFER BY ARRAYS OF TWO-DIMENSIONAL JETS DIRECTED NORMAL TO SURFACES INCLUDING THE EFFECTS OF A SUPERPOSED WALL-PARALLEL FLOW.

1 January 2019

proceedings article
Published by Begell House

p. 280-291
https://doi.org/10.1615/ihtc3.1900

Abstract

The average heat-transfer coefficient for arrays of slot-jets of air impinging normally on heat-transfer surfaces was investigated for ratios of the nozzle-spacing to the nozzle-width from 5 to 100 and for Re_b from 250 to 30 000, where Re_b is the Reynolds number based on the nozzle width and speed. In a selected case, a wall-parallel flow was superposed on the impinging jets with a speed up to about 60% of that in the jet without a detrimental effect on the heat transfer. The power-efficiency at heat transfer of impinging slot-jets compares well with impinging round jets and with internal channel-flow.

Keywords

SLOT JETS
HEAT TRANSFER
WIDTH
SPEED
FLOW
NOZZLE

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