Marangoni effect and heat pipe dry-out

In this study, Marangoni flows effects on heat pipe performances are explored. Recent results dealing with computations of the meniscus shape in a wedge are extended to take into account a nonzero flow rate, caused by the liquid mass lost at the evaporator and supplied by the vapor condensation at t...

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Bibliographic Details
Published in:Physics of fluids (1994) 2006-11, Vol.18 (11), p.118103-118103-4
Main Authors: Savino, R., Paterna, D.
Format: Article
Language:English
Subjects:
Applied sciences
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Heat pipes
Hydrodynamic stability
Physics
Surface-tension-driven instability
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Summary:In this study, Marangoni flows effects on heat pipe performances are explored. Recent results dealing with computations of the meniscus shape in a wedge are extended to take into account a nonzero flow rate, caused by the liquid mass lost at the evaporator and supplied by the vapor condensation at the opposite side. Moreover “inverse Marangoni effects” (prevailing in some binary mixtures) are investigated. Dry-out conditions have been computed for different flow rates and surface tension gradients. Results show that while dry-out occurrence is anticipated by the usual Marangoni effect, as illustrated by Yang and Homsy [Phys. Fluids 18, 042107 (2006) ], an inverse Marangoni effect is beneficial and dry-out conditions are delayed at much larger heating rates.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2397586