Rayleigh-B{é}nard Convection with Phase Change Close to the Critical Point
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909533996056576 |
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| author | Mouet, Valentin Michel, Guillaume Pétrélis, François Fauve, Stephan |
| author_facet | Mouet, Valentin Michel, Guillaume Pétrélis, François Fauve, Stephan |
| contents | Rayleigh-B{é}nard convection is investigated with sulfur hexafluoride (SF$_6$) in the vicinity of its critical point. In the supercritical domain, direct measurements of the heat flux $Q$ as a function of the temperature difference $ΔT$ are consistent with the usual scaling laws of single-phase turbulent convection. Along the liquid-vapor coexistence curve, heat fluxes are dramatically enhanced by condensation and boiling. Optical measurements are performed to document the size and velocity of the bubbles. We report $Q(ΔT, ε)$ in both domains, with $ε$ the dimensionless distance to the critical point. Critical scaling laws are observed that can guide the development of theoretical models. In addition, this documents a system of diverging heat transfer coefficient, i.e., in which a significant heat flux can be achieved with an arbitrarily small temperature difference as $ε\to 0$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_08191 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rayleigh-B{é}nard Convection with Phase Change Close to the Critical Point Mouet, Valentin Michel, Guillaume Pétrélis, François Fauve, Stephan Fluid Dynamics Soft Condensed Matter Rayleigh-B{é}nard convection is investigated with sulfur hexafluoride (SF$_6$) in the vicinity of its critical point. In the supercritical domain, direct measurements of the heat flux $Q$ as a function of the temperature difference $ΔT$ are consistent with the usual scaling laws of single-phase turbulent convection. Along the liquid-vapor coexistence curve, heat fluxes are dramatically enhanced by condensation and boiling. Optical measurements are performed to document the size and velocity of the bubbles. We report $Q(ΔT, ε)$ in both domains, with $ε$ the dimensionless distance to the critical point. Critical scaling laws are observed that can guide the development of theoretical models. In addition, this documents a system of diverging heat transfer coefficient, i.e., in which a significant heat flux can be achieved with an arbitrarily small temperature difference as $ε\to 0$. |
| title | Rayleigh-B{é}nard Convection with Phase Change Close to the Critical Point |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2503.08191 |