Vol. 337 No. 2 (2026)
DOI https://doi.org/10.18799/24131830/2026/2/5073
Heat and mass transfer during condensation on a vertical pipe placed in a granular layer of a microporous structure
Relevance. The necessity to develop innovative approaches to control condensation. The proposed two-layer analytical model describes heat and mass transfer on a vertical tube within a microporous medium, serving as a tool to enhance the efficiency of phase transition and heat removal while accounting for the physical parameters of the system. Aim. To validate the developed model by comparing its calculated results with those obtained from a more complex three-layer model proposed by other researchers. Methods. Mathematical modeling of the heat and mass transfer based on a two-layer scheme: a liquid condensate film on the tube surface and a microporous medium filled with saturated vapor. Results and conclusions. The research covers two types of media with differing wettability: hydrophilic and hydrophobic. It was established that in a hydrophilic medium, capillary effects cause the "suction" of condensate away from the tube wall into the vapor-gas environment. In the absence of capillary effects, a heat transfer correlation and an equation for the condensate film thickness near the tube wall were derived; these results show good agreement with established three-layer model calculations for a horizontal half-pipe embedded in a microporous layer under corresponding conditions. It is shown that under capillary effect conditions, the results of the proposed two-layer model demonstrate good convergence with data from the more complex three-layer model. For a hydrophobic medium, a higher condensate drainage rate along the tube wall was observed, leading to a significant reduction in film thickness – by nearly two orders of magnitude compared to a hydrophilic medium. This thinning of the film substantially intensifies heat transfer.
Keywords:
heat exchange during condensation, vertical pipe, microporous medium, capillary effects, hydrophobic medium, hydrophilic medium, condensate film
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