THEORETICAL STUDY AND REVIEW ON THE OPERATIONAL LIMITATIONS DUE TO VAPOUR FLOW IN HEAT PIPES | Zendy

Vincent Ayel | Zendy; Rémi Bertossi | Zendy; Cyril Romestant | Zendy; Yves Bertin | Zendy

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THEORETICAL STUDY AND REVIEW ON THE OPERATIONAL LIMITATIONS DUE TO VAPOUR FLOW IN HEAT PIPES

Author(s) -

Vincent Ayel,

Rémi Bertossi,

Cyril Romestant,

Yves Bertin

Publication year - 2012

Publication title -

frontiers in heat pipes

Language(s) - English

Resource type - Journals

ISSN - 2155-658X

DOI - 10.5098/fhp.v3.2.3001

Subject(s) - mechanics , heat flux , flow (mathematics) , vapor pressure , thermodynamics , materials science , heat transfer , physics

Vapour flow in heat pipes is subject to two operating limitations that can restrict the performances of such technologies. The first one is the viscous limitation: it occurs when the operating temperature is closed to the triple point and the pressure slope on the saturation curve, related to the temperature glide, is not large enough to counterbalance the viscous pressure losses of the vapour flow. The second one is the sonic limitation: it can appear when the vapour velocity becomes high so that it reaches the speed of sound. This paper presents a detailed description of the physical phenomena which take place in these two types of limitations. Some analytical expressions of maximal heat flux induced by the latter are also proposed.

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