Journal
HEAT AND MASS TRANSFER
Volume 45, Issue 12, Pages 1519-1532Publisher
SPRINGER
DOI: 10.1007/s00231-009-0527-4
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Funding
- DFG (Deutsche Forschungsgemeinschaft)
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Unsteady impinging jets are systematically controlled with respect to their time dependence in order to investigate the influence of unsteadiness on the heat transfer performance. This is achieved by a special mass flow control device, which allows almost arbitrary shapes of unsteadiness to be imposed onto the impinging jet. Three different standard signals (sinusoidal, triangular, rectangular) and two specially designed signals are applied and their influence on heat transfer is determined in terms of an enhancement factor. Heat transfer augmentation up to 30% was found and could be physically explained with the help of PIV and hot-wire measurements of the flow field.
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