Abstract
Self-organization of a cloud of liquid micro-droplets into an ordered two-dimensional array, levitating over a heated layer of liquid due to upward vapor flow, has been observed in several recent experimental works. In the present paper, the levitating micro-droplet array is studied under the condition when the liquid layer ruptures and a dry spot form on the heater. It has been found, that when the levitating micro-droplets are moving from wetted heater area to dry heater area and passing over the contact line, the micro-droplets levitation height is drastically increased, which is indicative of the intensive evaporation occurring in the region of the contact line.
Highlights
A spatially ordered structure of micro-droplets levitating above the free surface of a liquid layer spot-heated from below was discovered in [1]
In stratified two-phase flows, the highest heat transfer rate is reached in the regime when local dry areas on the heater quickly appear and disappear [9], forming multiple contact lines
With the help of high-speed imaging technique, we study the behaviour of the droplet array as it approaches and passes over the contact line region
Summary
A spatially ordered structure of micro-droplets levitating above the free surface of a liquid layer spot-heated from below was discovered in [1]. Among the effective solutions for removal of high heat fluxes, there are systems of spray cooling [4, 5] as well as systems using stratified two-phase flows in micro-/minichannels [6, 7]. The impact and subsequent spreading of droplets on the surface results in formation of multiple contact lines. In stratified two-phase flows, the highest heat transfer rate is reached in the regime when local dry areas on the heater quickly appear and disappear [9], forming multiple contact lines
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