Thermographic investigation of surface temperature of the evaporating liquid layer under the action of gas flow

Aleksei Kreta,Yuriy Lyulin

doi:10.1051/matecconf/20179201048

Abstract

An experimental study of the temperature field on the surface of horizontal liquid layer (Ethanol) evaporating into gas flow (Air) has been performed. Temperature gradient of the gas-liquid interface has been measured with the help of Titanium 570M IR camera. Shear stresses on gas-liquid interface induced by thermocapillary effect and inert gas flow have been defined.

Highlights

Study of heat and mass transfer through the gas-liquid interface is one of the most important problems in the present time
Infrared study and measurements of the temperature field on the surface of horizontal liquid layer evaporating into gas flow has been performed
Temperature gradient of the gas-liquid interface has been measured with the help of Titanium 570M IR camera

Summary

Introduction

Study of heat and mass transfer through the gas-liquid interface is one of the most important problems in the present time. The intensive evaporation from the liquid surface into the gas flow induces various convective flows within the liquid. One of them is the gravity that acts essentially on density differences due to temperature gradients, the other one is the thermocapillarity originated by the temperature dependence of the surface tension at the liquid interface. When the convection is induced by the surface tension, it is referred to as Marangoni-Bénard convection. In the most of investigations the fluid layers are steadily heated from below with a static temperature gradient and without evaporation. The evaporating fluid layers with nonlinear temperature gradient have much less been studied due to the complexity of the problem. It was found that evaporation is a means of cooling the layer surface, and a driving power for the development of the convective instabilities

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