The Effect of Inclination Angle on Critical Heat Flux in a Locally Heated Liquid Film Moving Under the Action of Gas Flow in a Mini-Channel

Egor M Tkachenko,Dmitry V Zaitsev,G.V Kuznetsov,P.A Strizhak,A.O Zhdanova,E.E Bulba

doi:10.1051/matecconf/20167201114

Egor M Tkachenko, Dmitry V Zaitsev + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/20167201114

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Abstract

Intensively evaporating liquid films moving under the action of the cocurrent gas flow in a microchannel are promising for the use in modern cooling systems of semiconductor devices with high local heat release. This work has studied the dependence of the critical heat flux on the inclination angle of the channel. It has been found that the inclination angle in the plane parallel to the flow has no significant effect on the critical heat flux. Whereas the inclination angle in the plane perpendicular to the flow, on the contrary, significantly changes the value of the critical heat flux. However, for a given flow rate of fluid there is a threshold gas velocity at which the critical heat flux does not differ from the case of zero inclination of the channel. Thus, it can be concluded that the cooling system based on shear-driven liquid films can be potentially used when direction of the gravity changes.

Highlights

The development of modern microelectronic equipment requires efficient cooling systems because of the need to remove high heat fluxes, up to 1 kW/cm2 from local areas of the processor [1]
In this work we investigated how the inclination angle in the flow symmetry plane, 4, affects the flow, breakup and critical heat flux
It is seen that the critical heat flux weakly depends on the inclination angle, except for the case 4 = -90 ̊, where two points fall out of the generalization

Summary

Introduction

The development of modern microelectronic equipment requires efficient cooling systems because of the need to remove high heat fluxes, up to 1 kW/cm from local areas of the processor [1]. Authors of experimental works [68] established the basic laws of the flow and crisis phenomena in the liquid film, moving under the action of the gas flow in the horizontal channel with 1x1 cm heater (simulating an electronic device). Thermal control of electronic devices in transportation, aircrafts and space vehicles requires the analysis of the influence of the gravity direction on the cooling system efficiency. This paper presents experimental data on the critical heat flux for different inclination angles of the working area to the horizon

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