Journal
HEAT AND MASS TRANSFER
Volume 45, Issue 2, Pages 193-206Publisher
SPRINGER
DOI: 10.1007/s00231-008-0410-8
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Funding
- German Ministry of Economics and Technology [10024592]
- Rolls-Royce Germany Ltd Co
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The paper concentrates on increasing convective heat transfer due to periodically pulsating impinging air jets. A maximum enhancement rate of cooling effectiveness up to 20% could be detected at an excitation Strouhal number of Sr = 0.82 when using a high pulsation magnitude. Reductions up to 5% occured at low Strouhal numbers with coincident high pulsation magnitudes as well. The thermal results were completed with phase-locked flow field investigations by means of PIV and surface visualizations using the oil film method.
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