Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........33p&link_type=abstract
Thesis (PH.D.)--BRIGHAM YOUNG UNIVERSITY, 1993.Source: Dissertation Abstracts International, Volume: 54-06, Section: B, page: 32
Computer Science
1
Scientific paper
Infrared radiometric techniques have been used to characterize local heat transfer for single free-surface liquid jets and arrays of free-surface liquid jets. The single-jet study deals with the effect of selected nozzle configurations on the local heat transfer in the stagnation zone, and is accompanied by a separate flow structure study. The results show that for identical jet Reynolds numbers, significant differences (as much as 40%) exist in the magnitudes of the local Nusselt number for the four nozzle configurations studied. Local heat transfer results reveal that for already turbulent jets, the dimensionless mean radial velocity gradient appears to be more influential in determining the heat transfer than changes in turbulence level. An empirical correlation of the experimental data supports this conclusion, and reveals that the stagnation Nusselt number is affected independently by the jet Reynolds number and the dimensionless mean radial velocity gradient. The multiple-jet study reveals local heat transfer characteristics of jet arrays. The different inter-jet flow interaction, as represented by different jet array configurations (the in-line array and the staggered array with different nozzle-to-nozzle spacings), shows negligible influence on local heat transfer under the central jet. The secondary stagnation Nusselt number between the adjacent jets is a direct consequence of the inter-jet flow interaction, and can be as high as 50% of the primary stagnation Nusselt number. Local and average heat transfer also show dependence on the nozzle-to-plate spacing. A correlation for average heat transfer is proposed.
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