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Cooling by Baroclinic Acoustic Streaming

Abstract : In the absence of natural convection, efficient heat transfers rely on externally forced flows. Generating such flows with acoustic waves rather than mechanical fans would enable remote locations to be cooled using virtually infinite lifetime transducers. This outlook is reinforced by the recent discovery that standing acoustic waves drive streaming flows of much higher velocities if the background medium is inhomogeneous. This regime of streaming is investigated experimentally in a cavity filled with stably-stratified air in which horizontal sound waves are found to significantly enhance heat transfers. The additional heat flux scales as the square of the input acoustic power for low amplitude waves and increases with the air stratification. These two features qualitatively match theoretical predictions, although corrections possibly ascribed to gravity are observed.
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Contributor : Guillaume Michel Connect in order to contact the contributor
Submitted on : Friday, November 19, 2021 - 9:54:40 PM
Last modification on : Wednesday, January 12, 2022 - 3:10:34 AM


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Guillaume Michel, Christophe Gissinger. Cooling by Baroclinic Acoustic Streaming. Physical Review Applied, American Physical Society, 2021, 16, pp.L051003. ⟨10.1103/PhysRevApplied.16.L051003⟩. ⟨hal-03437452⟩



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