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Film condensation generated by free convection in a porous medium

In this paper, the steady process of laminar film condensation on a vertical wall with the backside cooled by free convection in a fluid-saturated porous medium is analysed as a conjugate problem. In the analysis, neither the temperature nor the heat flux at the wall sides is assumed, but they are determined from the solution like other unknown parameters. The analysis is conducted in a dimensionless way to generalize the solution. The main variables controlling the film condensation process are revealed from the analysis, which define the relative importance of interactive wall conduction, free convection and film condensation modes. The study indicates that the conjugate solution of laminar-film condensation problem is different from a Nusselt-type solution.
PAPER REVISED: 2016-12-14
PAPER ACCEPTED: 2016-12-25
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