Study of water droplet evaporation in a mini-channel with gas flow

Evgeniy Orlik,Ekaterina Isachenko,G.V Kuznetsov,P.A Strizhak,A.O Zhdanova

doi:10.1051/matecconf/20179201002

Abstract

A series of experiments was conducted to study the evaporation of single water droplets with volume of 80~150 μl on the polished stainless steel substrate in temperature range of the substrate surface of 25–80°C in 6 mm high mini-channel with gas flow and the Reynolds number of the gas flow within 0-2500. New data on the water drop evaporation depending on the temperature of gas were obtained. The shadow method was the main method of measurement. As a result of experiments the experimental dependences for evaporation were obtained, and the influence of the gas flow rate and temperature on the water drop evaporation was analyzed.

Highlights

Further development of the microelectronic and power technology, which is widely used in the creation of modern ecological transport, in aircraft and space industry, is hampered by a serious technical problem of removal of high local heat fluxes, emitted on the chip and electronic elements
Experimental studies show that the maximum heat removal is realized from the contact line [5], whose thickness is about tens microns [6]
Present paper is devoted to the detailed investigation of the evaporation of water droplet placed on a heated substrate in a flat mini-channel with air flow

Summary

Introduction

Further development of the microelectronic and power technology, which is widely used in the creation of modern ecological transport, in aircraft and space industry, is hampered by a serious technical problem of removal of high local heat fluxes, emitted on the chip and electronic elements. By far the most effective method of heat removal is based on the use of the phase transition and is directly related to the liquid evaporation. Spray cooling by the flow of droplets shows high efficiency of heat removal [1], but the very process of liquid drop evaporation is still not fully understood. Droplet evaporation has been in detail studied both numerically and experimentally, but mostly in open atmosphere. Experimental studies show that the maximum heat removal is realized from the contact line [5], whose thickness is about tens microns [6]. The influence of gas flow on the droplet evaporation is known, all related studies were conducted in the open air with insufficient controlled conditions [8]. The experimental results obtained may be used to develop a new method of heat remvoal on the basis of near-wall drop motion

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Conclusion