Evaporation of an intensively heated sessile droplet into the open atmosphere

Andrey Semenov,Geniy Kuznetsov,Dmitry Zaitsev,D.V Zaitsev,O.A Kabov

doi:10.1051/matecconf/20168400035

Andrey Semenov, Geniy Kuznetsov + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/20168400035

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Abstract

Evaporation of a heated sessile water drop was studied experimentally at a temperature difference between the substrate and surrounding atmosphere from 30 to 60°C. The studies were performed on the substrates with micro- and nanocoatings with different wettability. The features of evaporation were studied for the pinned, partially pinned and depinned contact line (solid-liquid-gas interface). It is found that during the evaporation process the specific evaporation rate (mass loss per unit of the drop surface area) increases, particularly at the last stage of the drop lifetime.

Highlights

Among the effective solutions for removing high heat flux densities, there are the systems of spray cooling [1] as well as the systems using stratified two-phase flow in a microchannel [2]
In this paper we study the process of evaporation of relatively large liquid droplets to open atmosphere
The substrate surface temperature was measured with the thermocouple fixed at a distance of 1 - 2 mm from the contact line of a liquid droplet

Summary

Introduction

Among the effective solutions for removing high heat flux densities, there are the systems of spray cooling [1] as well as the systems using stratified two-phase flow in a microchannel [2]. Heat in these systems is removed due to intensive evaporation of liquid droplets that are in contact with hot surface. Research on nonisothermal evaporation of liquid droplets with a sufficiently high temperature difference between the substrate and the atmosphere is practically absent.

Results

Conclusion