Comparison of thermal characteristics of confined and unconfined impinging jets

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In the present study, we compared the thermal performance of the two types of impinging jets: confined and unconfined impinging jets. In order to obtain the thermal characteristics of impinging jets, experimental investigations for air and water are conducted. The effects of dimensionless pumping powers ðP pump ¼ 1:35  1010  4  1013Þ on the Nusselt number are considered. The focus is on the cases where the nozzle-to-plate spacing is equal to or less than one nozzle diameter (H/d 6 1). The results show that the thermal performance of the confined jet is similar to that of the unconfined jet under a fixed pumping power condition, while the thermal performance of the confined jet is 20–30% lower than that of the unconfined jet under a fixed flow rate condition. Based on the experimental results, generalized correlations for the stagnation and average Nusselt numbers for both confined and unconfined impinging jets are presented as a function of the dimensionless pumping power and the Prandtl number.
Publisher
Elsevier
Issue Date
2010-03-31
Keywords

Impinging jet; Confinement

Citation

International Journal of Heat and Mass Transfer, Volume 53, Issue 15-16, July 2010, Pages 3366-3371

Series/Report no.
3366-3371
ISSN
0017-9310
URI
http://hdl.handle.net/10203/19559
Appears in Collection
ME-Conference Papers(학술회의논문)

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