On the Impact of Ambient Humidity and Evaporation on Demixing of Binary Mixtures.

As per known data, hexane and diethylene glycol monoethyl ether (DGME) are perfectly miscible at temperatures above some 6 °C (critical solution temperature, CST), manifesting a miscibility gap below this temperature. Yet, when deposing hexane-DGME layers or sessile droplets, we unexpectedly observe demixing already at room temperature. As hexane is volatile, one may be tempted to explain this in terms of evaporative cooling.

Active Role of Vapor Clouds around Evaporating Sessile Droplets in Microgravity: Marangoni Jets and Electroconvection.

A benchmark microgravity experiment (dubbed "ARLES") is analyzed. It concerns evaporation of several-μL sessile droplets with a pinned millimetric circular contact line on a flat substrate into a vast calm (here nitrogen) atmosphere at nearly normal conditions. Hydrofluoroether (HFE-7100) is used as a working liquid whose appreciable volatility and heavy vapor accentuate the contrast between the micro- and normal gravity.

Erratum: Leidenfrost effect: Accurate drop shape modeling and refined scaling laws [Phys. Rev. E 90, 053011 (2014)].

This corrects the article DOI: 10.1103/PhysRevE.90.

Controlling the wetting and evaporation dynamics of non-ideal volatile binary solutions.

Hypothesis: Volatile binary liquid samples on wetting substrates are known to undergo either spreading or contraction tendencies, as a result of solutal Marangoni stresses due to differential volatility. Enhanced spreading is commonly thought to occur when the lower surface tension component is more 'volatile', while contraction is expected otherwise. We seek to test the limits of this scenario for various configurations such as sessile drops with free or pinned contact lines, without or with microparticles, and tears-of-wine menisci.

Spheroidal approximation for finite-amplitude highly viscous axisymmetric drop/bubble free shape relaxation.

A common simplification used in different physical contexts by both experimentalists and theoreticians when dealing with essentially non-spherical drops is treating them as ellipsoids or, in the axisymmetric case, spheroids. In the present theoretical study, we are concerned with such a spheroidal approximation for free viscous shape relaxation of strongly deformed axisymmetric drops towards a sphere. A general case of a drop in an immiscible fluid medium is considered, which includes the particular cases of high and low inside-to-outside viscosity ratios (e.