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On the radial heat transfer coefficient in grooved heat pipe

par Rossomme, Séverine ;Goffaux, Cécile;Hillewaert, Koen;Colinet, Pierre
Référence EUROTHERM(84: 25-27 mai 2009: Namur), Proceedings of the EUROTHERM n°84 Seminar on “Thermodynamics of Phase Changes”
Publication Publié, 2009

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Résumé :

It is well known that microscopic effects are important in the evaluation of the radial heat transfer within a grooved heat pipe evaporator. We develop a multi-scale model which is composed of two parts, macroscopic and microscopic, which cannot be decoupled from each other. In our study, we include various effects such as the disjoining pressure, the influence of the interfacial curvature, the variation of the saturation temperature, the interfacial resistance and the thermal conduction. The macroscopic part consists in a heat conduction problem with a mixed boundary condition at the meniscus, while the microscopic part is based on a classical lubrication type theory which allows to determine, thanks to a correlation, the apparent contact angle. This last quantity is essentially in order to couple the two scales. We also underline in particular the variation of the heat transfer coefficient with, on the one hand, the apparent contact angle and, on the other hand, the geometry of the groove.