The dynamics and stability of thin liquid films have fascinated scientists over many decades: the observations of regular wave patterns in film flows down a windowpane or along guttering, the patterning of dewetting droplets, and the fingering of viscous flows down a slope are all examples that are familiar in daily life. Thin film flows occur over a wide range of length scales and are central to numerous areas of engineering, geophysics, and biophysics; these include nanofluidics and microfluidics, coating flows, intensive processing, lava flows, dynamics of continental ice sheets, tear-film rupture, and surfactant replacement therapy. These flows have attracted considerable attention in the literature, which have resulted in many significant developments in experimental, analytical, and numerical research in this area. These include advances in understanding dewetting, thermocapillary- and surfactant-driven films, falling films and films flowing over structured, compliant, and rapidly rotating substrates, and evaporating films as well as those manipulated via use of electric fields to produce nanoscale patterns. These developments are reviewed in this paper and open problems and exciting research avenues in this thriving area of fluid mechanics are also highlighted.

Dynamics and stability of thin liquid films

Evaporation of pure liquid sessile and spherical suspended drops: a review.

Evaporation of a Droplet: From physics to applications

The formation of turbulent patterns in plane Couette flow is investigated near the onset of transition, using numerical simulation in a very large domain of size 800 h x 2h x 356 h. Based on a maxi ...

Formation of turbulent patterns near the onset of transition in plane Couette flow

Journal of Chemical Physics, Vol. 36-37 : 1962年に発表されたレオロジー関連の論文

Although droplet evaporation is widely assumed to be a diffusion process, our results show that when a droplet evaporates sufficiently fast it exhibits a vigorous interior flow. This flow is driven by surface tension gradients. The typical interior flow field behavior is shown as well as measurements of the droplet surface area and volume as it evaporates. We also discuss the droplet lifetime and how the system tends toward a state of marginal stability. \textcopyright{} 1996 The American Physical Society.

Natural convection in droplet evaporation

https://hal.archives-ouvertes.fr/hal-01261281/document

Growth of a dry spot under a vapor bubble at high heat flux and high pressure

This study deals with a simple pure fluid whose temperature is slightly below its critical temperature and whose density is nearly critical, so that the gas and liquid phases coexist. Under equilibrium conditions, such a liquid completely wets the container wall and the gas phase is always separated from the solid by a wetting film. We report a striking change in the shape of the gas-liquid interface influenced by heating under weightlessness where the gas phase spreads over a hot solid surface showing an apparent contact angle larger than 90 degrees. We show that the two-phase fluid is very sensitive to the differential vapor recoil force and give an explanation that uses this nonequilibrium effect. We also show how these experiments help to understand the boiling crisis, an important technological problem in high-power boiling heat exchange.

https://hal.archives-ouvertes.fr/hal-01261321/document

Gas spreading on a heated wall wetted by liquid.

We present an experimental study of the thermal response to a positive temperature quench in two-phase fluid ${\mathrm{SF}}_{6}$ in low gravity for temperature ranging from $10.1$ to $0.1$ K from the critical temperature. The temperature was measured simultaneously in the gas, the liquid, and the cell wall by thermistors and the density distribution was observed by interferometry. During the quench the gas temperature considerably exceeded the temperature of the heating walls (overheating up to $23%$). This striking observation is discussed in the light of the adiabatic heat transfer in this highly compressible fluid while the key role of the localization in low gravity of the gas and liquid phases is revealed.

/pdf/thermalization-of-a-two-phase-fluid-in-low-gravity-heat-2tpuxj6cmd.pdf

John Hegseth

Papers

Natural convection in droplet evaporation

Growth of a dry spot under a vapor bubble at high heat flux and high pressure

Gas spreading on a heated wall wetted by liquid.

Thermalization of a two-phase fluid in low gravity: heat transferred from cold to Hot

Turbulent spots in plane Couette flow.