Impinging synthetic jets are considered as a potential solution for convective cooling, in applications that match their main characteristics (high local heat transfer rates, zero net mass flux, scalability, active control). Nevertheless the understanding of heat transfer to synthetic jets falls short of that available for steady jets. To address this, this paper uses detailed flow field measurements to help identify the main heat transfer mechanisms in impinging synthetic jets. Local heat transfer measurements have been performed for an impinging round synthetic jet at a range of Reynolds numbers between 1000 and 3000, nozzle to plate spacings between 4D and 16D and stroke lengths (L0) between 2D and 32D. The heat transfer results show evidence of distinct regimes in terms of L0/D and L0/H ratios. Based on appropriate scaling, four heat transfer regimes are identified which justifies a detailed study of the flow field characteristics. High speed particle image velocimetry (PIV) has been employed to measure the time-resolved velocity flow fields of the synthetic jet to identify the flow structures at selected L0/H values corresponding to the identified heat transfer regimes. The flow measurements support the same regimes as identified from the heat transfer measurements and provide physical insight for the heat transfer behaviour.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4940-8
PROCEEDINGS PAPER
Heat Transfer Behaviour and Flow Field Characterisation of Impinging Synthetic Jets for a Wide Range of Parameters Available to Purchase
Rayhaan Farrelly,
Rayhaan Farrelly
Trinity College Dublin, Dublin, Ireland
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Alan McGuinn,
Alan McGuinn
Trinity College Dublin, Dublin, Ireland
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Tim Persoons,
Tim Persoons
Trinity College Dublin, Dublin, Ireland
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Darina Murray
Darina Murray
Trinity College Dublin, Dublin, Ireland
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Rayhaan Farrelly
Trinity College Dublin, Dublin, Ireland
Alan McGuinn
Trinity College Dublin, Dublin, Ireland
Tim Persoons
Trinity College Dublin, Dublin, Ireland
Darina Murray
Trinity College Dublin, Dublin, Ireland
Paper No:
IHTC14-22864, pp. 667-674; 8 pages
Published Online:
March 1, 2011
Citation
Farrelly, R, McGuinn, A, Persoons, T, & Murray, D. "Heat Transfer Behaviour and Flow Field Characterisation of Impinging Synthetic Jets for a Wide Range of Parameters." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 5. Washington, DC, USA. August 8–13, 2010. pp. 667-674. ASME. https://doi.org/10.1115/IHTC14-22864
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