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Can heat flow backward? unusual thermal phenomena observed in near-critical fluids

Abstract : A study is presented concerning an experiment under weightlessness. A pure fluid (SF6) is heated near and below its critical point, where liquid coexists with vapor. After the temperature rise, the vapor phase passes well beyond the temperature of the heating walls. This surprising finding is discussed in the light of an adiabatic heat transfer or "Piston effect" and the special geometry of the liquid and vapor. In addition, the shape of the gas-liquid interface is distorted near the solid wall by the thrust of vapor production ("recoil" force), a precursor to the well-known boiling crisis in heat exchanger.
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https://hal.archives-ouvertes.fr/hal-00818179
Contributor : Stéphane Toulin Connect in order to contact the contributor
Submitted on : Thursday, July 1, 2021 - 1:01:43 PM
Last modification on : Tuesday, December 7, 2021 - 1:16:05 PM
Long-term archiving on: : Saturday, October 2, 2021 - 6:45:22 PM

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Daniel Beysens, Yves Garrabos, Régis Wunenburger, Carole Lecoutre-Chabot. Can heat flow backward? unusual thermal phenomena observed in near-critical fluids. Physica A: Statistical and Theoretical Physics, 2002, 314 (1-4), pp.427-436. ⟨10.1016/S0378-4371(02)01175-5⟩. ⟨hal-00818179⟩

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