Effects of a wavy interface on steam-air condensation on a vertical surface

A CFD study of wave influence on film steam condensation in the presence of non-condensable gas

“…Kim and Corradini (1990) considered a wavy interface of the falling film in their study as a rough wall surface, and they found that waves can enhance the condensation heat transfer up to 10%. Park et al (1997) studied wave influence on condensation experimentally. They found that the falling film can enhance condensation mass transfer due to the wavy interface.…”

Condensation heat transfer enhancement in the presence of non-condensable gas using the interfacial effect of dropwise condensation

“…The condensation heat transfer coefficients were found to be dependent not only on the steam concentration but also on the wave characteristics of the falling liquid layer, and the dominant factors were attributed to the dynamic interaction between the interfacial waves and the adjacent gas layer. Park et al [13,14] dealt with the enhanced condensation heat transfer by the waviness of condensate film within the diffusion layer of a steam-air mixture in a vertical rectangular duct.…”

Bond graph model of a vertical U-tube steam condenser coupled with a heat exchanger

“…It corrects the heat transfer by 15%, which is in accordance with the maximum correction factor of 20% suggested in [24]. This takes care of the uncertainties in estimating parameters such as the heat transfer coefficients, which are extremely sensitive to the surface roughness [29][30] of the inside and outside of the tubes, etc. There are some recent researches into finding good correlations for film condensation [31], but it is not easy to apply them in a physical model.…”

“…These formulations are used in the following sections to construct the bond graph model of the condenser. Note that the formulations described in this section are simple and more accurate formulations are available in literature (see [25][26] for extended Nusselt's formulation, [27] for Maxwell-Stefan equation based formulations for mixtures, [28] for effect of non-condensable gases, [29][30] for effect of wavy interface, etc., and the references therein for further details). Fig.…”