Abstract
Evaporation of a heated sessile water micro-drop was studied experimentally at the substrate temperature and surrounding atmosphere from 30 to 50 °C. The studies were performed on the float glass substrate with aluminum nanocoating of optical quality. The research has shown that the specific rate of evaporation (mass loss per unit of the drop surface area) increases with the decrease in droplet volume and at the last stage several times exceeds the initial value.
Highlights
Some of the effective solutions for removal of high heat flux densities are spray cooling systems [1] and systems using the stratified two-phase flow in a microchannel [2, 3]
This paper investigates the evaporation of liquid droplets having an initial volume of less than 1 μl
The second optical technique consisted of a digital video camera Point Grey Grasshopper3 (4.1 Mpix) with a microscope lens 20X Mitutoyo Telecentric Objective
Summary
Some of the effective solutions for removal of high heat flux densities are spray cooling systems [1] and systems using the stratified two-phase flow in a microchannel [2, 3]. In certain regimes in these systems the heat is removed due to intense evaporation of liquid micro-drops. The evaporation of liquid drops on the heated plate was, as a rule, studied using sufficiently large droplets with an initial volume of about 100 μl [4-9].
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