An experimental study of thermocapillary rupture of a locally heated horizontal liquid layer on various substrates

This article experimentally studies a thermocapillary rupture of a locally heated horizontal liquid film on substrates of different materials and different thickness. In the course of work the dependence of the critical heat flux on the initial and final film thickness was determined. Upon reaching the heat flux and film thickness at which the liquid film boils up, the film disrupts at almost constant finite thickness. The research has shown that with an increase in thermal conductivity and thickness of the substrate the critical heat flux increases. On the substrates of a material with high thermal conductivity (copper) the heat flux is redistributed on the substrate; at that the localization of heating is lost, and the rupture is not observed.