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Piston-effect-induced thermal jets in near-critical fluids

Abstract : In very compressible fluids, such as fluids near their critical point, the bulk fluid is adiabatically thermalized by the expansion of a hot boundary layer. Thanks to this thermomechanical processthe so-called piston effectthe fluid velocity at the edge of the boundary layer can become very high when the heating power is concen-trated in a fissure. Spectacular jets are then observed in SF6and CO2. Data obtained under weightlessnessinorder to remove convectionand data obtained under earth gravity are compared and analyzed. They empha-size the key role of the boundary layer expansion for thermal phenomena in compressible fluids and thehydrodynamic nature of the piston effect
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https://hal.archives-ouvertes.fr/hal-00130895
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Submitted on : Thursday, July 1, 2021 - 3:00:11 PM
Last modification on : Friday, August 5, 2022 - 11:54:22 AM
Long-term archiving on: : Saturday, October 2, 2021 - 6:58:15 PM

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Thomas Fröhlich, Daniel Beysens, Yves Garrabos. Piston-effect-induced thermal jets in near-critical fluids. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2006, 74 (4), 046307 (6 p.). ⟨10.1103/PhysRevE.74.046307⟩. ⟨hal-00130895⟩

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