Abstract
Abstract With the objective of estimating the thermal resistance of a two-phase closed thermosyphon (TPCT), the work presented is a state of the art of condensation and falling film evaporation/boiling correlations. A deep analysis of up-to-date reported equations dealing with falling film heat transfer is carried out and recommendations are provided to select the most suitable and reliable correlations. Mechanisms such as filmwise condensation and Nusselt theory, falling film development in the thermal entry length (TEL), film thickness, appearance of waves and turbulence, two-phase flow interaction and entrainment with the shear stress at the liquid-vapour interface, falling film evaporation and boiling, in addition to film breakdown, are comprehensively explained and discussed. For all sections, the advised correlations are reported in a clear and simple way using tables. The objective of this paper is to cover sufficient knowledge on the falling film dynamic in thermosyphons to ease the prediction of heat transfer coefficients. This paper can be taken as a starting point for thermosyphon users in the study of falling film heat transfer in wickless heat pipes.
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