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Film condensation heat transfer on a vertical porous-layer coated plate

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Abstract

Film condensation on a vertical porous coated plate is investigated numerically for a porous/fluid composite system based on the dispersion effect in the porous coating. The mathematical model improves the conventional matching conditions by considering the stress force at the porous coating interface. The numerical results show the effects of the porous coating thickenss, the effective thermal conductivity and the permeability on condensate film thickness and local Nusselt number. The predicted average Nusselt number has similar tendencies to experimental results reported in literature, such that using a thin porous coating would be a viable alternative for enhancing the condensation heat transfer.

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Author notes

  1. Xuehu Ma

    Present address: Institute of Chemical Engineering, Dalian University of Technology, 116012, Dalian, China

Authors and Affiliations

  1. Thermal Engineering Department, Tsinghua University, 100084, Beijing, China

    Xuehu Ma & Buxuan Wang

Authors
  1. Xuehu Ma
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  2. Buxuan Wang
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Additional information

Project supported by the National Postdoctoral Research Foundation of China

Nomenclature:F r, Modified Froude number;g, gravitational acceleration;H, dimensionless porous coating thickness;h, porous coating thickness;h tg, latent heat of evaporation;K, permeability;k, thermal conductivity;L, plate length;m, condensate mass flow;q″, local heat flux;T, temperature;U, dimensionless velocity;u,x-component of velocity;V i, deviation velocity;x, vertical Cartesian coordinate;X, dimensionless vertical coordinate;y, horizontal Cartesian coordinate;Y, dimensionless horizontal coordinate. Greek symbols;α, condensation heat transfer coefficients; δ, condensate film thickness; σ, dimensionless temperature; μ, dynamic viscosity; ϕ, friction coefficients; π, density. Subscripts: e, effective porous/fluid; i, interface; 1, external condensate zone; L, averaged along the vertical length; p, porous coating zone; s, saturation; v, vapor; w, wall; x, local value. Superscript: dimensionless.

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Ma, X., Wang, B. Film condensation heat transfer on a vertical porous-layer coated plate. Sci. China Ser. E-Technol. Sci. 41, 169–175 (1998). https://doi.org/10.1007/BF02919679

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  • DOI: https://doi.org/10.1007/BF02919679

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