Optimum jet-to-jet spacing of heat transfer for staggered arrays of impinging air jets

The effect of jet-to-jet spacing on the local Nusselt number for confined circular air jets vertically impinging on a flat plate is investigated. Five jets in equilaterally staggered arrays are considered. The surface heat flux on the plate is 1500 W m −2 . The jet diameter is 3 mm. Three different...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2001-11, Vol.44 (21), p.3997-4007
Main Authors: San, Jung-Yang, Lai, Mao-De
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat transfer
Impingement
Jet
Nusselt number
Stagnation point
Theoretical studies. Data and constants. Metering
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Summary:The effect of jet-to-jet spacing on the local Nusselt number for confined circular air jets vertically impinging on a flat plate is investigated. Five jets in equilaterally staggered arrays are considered. The surface heat flux on the plate is 1500 W m −2 . The jet diameter is 3 mm. Three different jet Reynolds numbers ( Re= 10,000, 20,000 and 30,000) are individually considered. The influence of jet-to-jet spacing, Re and jet height on the stagnation Nusselt number of the center jet is experimentally investigated. An optimum ratio of jet-to-jet spacing to jet diameter, ( s/ d) opt, is obtained. The existence of the ( s/ d) opt is attributed to jet interference before impingement and/or formation of jet fountain between two adjacent jets. The stagnation Nusselt number is correlated as a function of Re, s/ d and H/ d.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(01)00043-6