Numerical Study of Thin Film Condensation in Forced Convection in a Canal Whose Walls Are Covered with a Porous Material: Influence of Jacob Number-Determination of Lengths of Entry
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In this paper, the numerical study of the condensation of thin layers in forced convection of pure saturated vapor in a channel whose walls are covered with a porous material is presented. The generalized model Darcy-Brinkman-Forchheimer (DBF) is used to describe the flow in the porous medium, while the classical boundary layer equations have been exploited in pure liquid. This study examines and demonstrates the influence of the Jacob number on the velocity and on the temperature profiles in porous media and pure liquid, the thickness of the liquid film, the local Nusselt number and the Lengths of entry. It has been noticed that the Jacob's number is a very determining parameter on transfers and condensation. The higher the number of Jacob is, the slower the flow is, and therefore more condensation is favoured and the thickness of the liquid film increases. This increase in the thickness of the liquid film results in greater thermal resistance; therefore, a decrease in heat exchange and in the local Nusselt number can be noticed. An exponential decrease in the length of entry is noted and it is strong when the number of Jacob is between Ja = 1E-8 and Ja = 2E-8: a great sensitivity of condensation can be seen, in conclusion.
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