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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL INVESTIGATION ON INTERNAL HEAT TRANSFER OF IMPINGEMENT/EFFUSION DOUBLE WALL COOLING WITH VARIOUS CROSSFLOW SCHEMES

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.021397
pages 5159-5166

Sinopsis

The present study reports the effects of different crossflow schemes on the internal heat transfer performance in an impingement/effusion double wall cooling system. An impingement plate and a flat target plate with effusion holes construct the double-wall cooling system at a low jet to plate spacing of H/D=1.5. A numerical investigation is conducted to obtain the detailed information of the flow field and the temperature field at Reynolds numbers ranging from 5,000 to 30,000. In this paper, three crossflow schemes were studied, including zero, maximum and intermediate. And computations of the impingement cooling are also conducted for comparisons, which only has two crossflow schemes: intermediate, maximum. It is found that the Nusselt number of the internal wall of the target plate increases if the strength of the crossflow reduces. So the impingement/effusion cooling with zero crossflow has the highest Nusselt number in all working conditions. The Nusselt number of the impingement/effusion cooling with maximum crossflow or intermediate crossflow is higher than that of the corresponding impingement cooling because the discharge flow through the effusion holes weakens the crossflow, and the improvement of the Nusselt number can be up to 12.1% in the cases with maximum crossflow scheme at Re=30,000. The impingement/effusion cooling with intermediate crossflow shows the highest thermo-hydraulic performance as it requires the smallest pumping power at the same Reynolds number with other cases.