Performance evaluation of synthetic jet cooling with cross flow
Vivek Mathew JOSE
Abstract. Jet cooling is one of the effective methods used in situations where high heat transfer is required. The performance of a jet can be enhanced by making the flow unsteady. The flow can be made unsteady by using a pulse jet or synthetic jet. In the case of synthetic jets, the major parameters on which the cooling performance depends are the frequency of flow fluctuation (f), normalized orifice to target spacing(Z/D), Reynolds number (Re) and cross flow. The cooling performance of a circular synthetic jet subjected to cross flow (lateral flow) is numerically investigated. Stokes number is varied from 32 to 93, Z/D from 2 to 12, Re from 5100 to 23000 and ratio of cross to jet flow Reynolds numbers(α) from 0 to 2. As in the case of steady jets, optimum value of Z/D is 6. At Z/D ≥10, synthetic jets are more effective than equivalent steady jets, irrespective of the Stokes number. At Z/D< 10 and at low Stokes numbers, steady jets outperform synthetic jets. In synthetic jets, fluctuation in stagnation Nusselt number is as high as 19 percent of the average value and is due to the impingement of primary vortices on the wall. At low values of Z/D, cross flow helps to enhance peak Nusselt number (Nu). Decrease in peak Nu is observed at high Z/D. At Z/D=6, stagnation Nu reduces by 47% when cross flow with α = 2 occurs. Performance deterioration in the upstream of the jet depends strongly on Z/D.
Keywords
Jet Impingement Cooling, Synthetic Jet, Cross Flow, Nusselt Number
Published online 3/1/2025, 10 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Vivek Mathew JOSE, Performance evaluation of synthetic jet cooling with cross flow, Materials Research Proceedings, Vol. 49, pp 74-83, 2025
DOI: https://doi.org/10.21741/9781644903438-8
The article was published as article 8 of the book Mechanical Engineering for Sustainable Development
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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