Publicou 18 edições por ano
ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561
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THEORETICAL ANALYSIS OF SODIUM VAPOR CONDENSATION ON A PLATE IMBEDDED IN A POROUS MEDIUM UNDER ZERO GRAVITY CONDITION
RESUMO
A theoretical model considering the capillary force rather than the gravitational force is established to study sodium vapor condensation heat transfer on a plate imbedded in a porous medium under zero gravity condition. The impacts of different parameters, including structural and operational ones, are discussed in detail. The results show that no matter what is the layer − thick porous (δ < H) or thin porous (δ > H) − the condensate film thickness δ decreases with the increasing permeability K and radiation source temperature Tr, while it increases with the increasing effective thermal conductivity λe, sodium vapor saturation temperature Ts, and the temperature difference ΔT. The variation trends of the local Nusselt number Nux and condensate film thickness δ versus related parameters, except for the porous medium layer thickness H, are contrary, since Nux tends to vary inversely with δ. Specially, for the case of δ > H, both Nux and δ increase with increasing H, which is different from the condensation of water vapor. Compared with no radiation heat transfer, the presence of radiation heat transfer makes the condensate film thickness δ reduced and the local Nusselt number Nux increased somewhat.