Experimental and Numerical Simulation of Heat Transfer in an Impact Synthetic Jet

Local heat transfer in an synthetic impact jet on a flat plate has been experimentally and numerically studied with a varying Reynolds number and pulse frequency. The thermal characteristics at the stagnation point on the surface of an obstacle have been studied: instantaneous and fluctuation values...

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Bibliographic Details
Published in:High temperature 2023-04, Vol.61 (2), p.206-212
Main Authors: Lemanov, V. V., Pakhomov, M. A., Terekhov, V. I.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Barriers
Classical and Continuum Physics
Flat plates
Fluid flow
Heat and Mass Transfer and Physical Gasdynamics
Heat flux
Heat transfer
Heat transfer coefficients
Industrial Chemistry/Chemical Engineering
Laser Matter Interaction
Materials Science
Mathematical analysis
Nusselt number
Physical Chemistry
Physics
Physics and Astronomy
Reynolds number
Stagnation point
Synthetic jets
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Summary:Local heat transfer in an synthetic impact jet on a flat plate has been experimentally and numerically studied with a varying Reynolds number and pulse frequency. The thermal characteristics at the stagnation point on the surface of an obstacle have been studied: instantaneous and fluctuation values of the heat flux rate and the spectrum of heat flux fluctuations. Measurements and numerical calculations of the local heat transfer coefficient are carried out under varying the distance to the plate and the amplitude and frequency of synthetic jet fluctuations. Regions with maximum instantaneous values of the heat flux and heat transfer coefficient are determined for local heat transfer values. The maximum value of the time-averaged Nusselt number is observed at the stagnation point of the synthetic impact jet for all considered distances to the obstacle surface. A qualitatively similar distribution of the Nusselt number over the radial coordinate corresponds to those for nonsteady and steady impact jets. The largest and smallest values of the averaged heat flux at the stagnation point were obtained at H / d = 4 and 1, respectively.
ISSN:0018-151X
1608-3156
DOI:10.1134/S0018151X23020128