Critical Heat Flux in a Locally Heated Liquid Film Driven by Gas Flow in a Minichannel

摘要

The rupture of a liquid film driven by friction with a gas flow in a horizontal minichannel and the heat-exchange crisis in this film locally heated by a 1 x 1 cm source in the channel wall has been experimen_tally studied. A heat flux of 250 W/cm~2 is achieved, which is greater by an order of magnitude than the limiting heat flux for a vertically falling liquid film with the same Reynolds number (Re_l = 21). These experiments confirmed good prospects for using gas-flow-driven liquid films in cooling systems of devices with intense local heat evolution.