HEAT TRANSFER FOR FILN BOILING OF A LIQUID ON A VERTICAL HEATED WALL IN A POROUS MEDIUM


  • A.A. Avramenko Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • M.M. Kovetskaya Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • E.A. Kondratieva Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • T.V. Sorokina Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
Keywords: heat transfer, film boiling of liquid, porous medium.

Abstract

The paper presents results of the modelling of heat transfer at film boiling of a liquid in a porous medium on a vertical heated wall. Such processes are observed at cooling of high-temperature surfaces of heat pipes, microstructural radiators etc. Heating conditions at the wall were the constant wall temperature or heat flux.

An analytical solution was obtained for the problem of fluid flow and heat transfer using the porous medium model in the Darcy-Brinkman. It was shown that heat transfer at film boiling in a porous medium was less intensive than in the absence of a porous medium (free fluid flow) and further decreased with the decreasing permeability of the porous medium. A sharp decrease in heat transfer was observed for the Darcy numbers lower than five. The analytical predictions of heat transfer coefficients qualitatively agreed with the data [14] though demonstrated lower values of heat transfer coefficients for the conditions of the constant wall temperature and constant wall heat flux.

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Published
2021-03-04
How to Cite
Avramenko, A., Kovetskaya, M., Kondratieva, E., & Sorokina, T. (2021). HEAT TRANSFER FOR FILN BOILING OF A LIQUID ON A VERTICAL HEATED WALL IN A POROUS MEDIUM. Thermophysics and Thermal Power Engineering, 43(1), 20-29. https://doi.org/https://doi.org/10.31472/ttpe.1.2021.3
Section
Heat and Mass Transfer Processes and Equipment, Theory and Practice of Drying