Microscale Heat and Mass Transport of Evaporating Thin Film of Binary Mixture

Characteristics of an evaporating thin film in a microchannel

“…The meniscus is superheated, and vapor space is assumed to consist of pure saturated vapor. The present model complements previous studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16] in three ways. First, heat transfer in the thin-film and micro regions is quantitatively compared and the relative contributions of the two regions to the overall heat transfer delineated.…”

“…The interfacial evaporation heat transfer coefficient h lv is plotted in Fig. 8 for wall superheats of 0.1 K and 1 K. It is clear that h lv is suppressed in the beginning due to the disjoining pressure as has been extensively discussed in the literature [4][5][6][7][8][9][10]. After a peak at x  400 nm, h lv is seen to decrease again, this time because of the suppression due to capillary pressure.…”

“…While the suppression effect of disjoining pressure on thin film evaporation has been widely discussed [4][5][6][9][10], a similar discussion of the effect of capillary pressure has seldom been reported. The interfacial evaporation heat transfer coefficient h lv is plotted in Fig.…”

“…Finally, a higher dispersion constant A is known to result in a longer thin-film region and to promote heat transfer [4][5][6][7][8][9][10]. A higher capillary pressure (due to a higher value of surface tension) also flattens the film profile.…”

“…The polarity effect was found to elongate the transition region while suppressing evaporation. Recently, binary liquids [10] have been found to induce a distillation-driven capillary stress to counteract the thermocapillary stress, leading to an elongation in thin-film length. Atomistic simulations by Freund [11] showed that the thermal resistance at the solid-liquid interface is significant in very thin films.…”