Abstract
Subcooled flow boiling of water was performed in a horizontal rectangular channel with a small heating surface of 10 mm square placed at the bottom of the channel. Microbubble emission boiling (MEB) occurred in transition boiling region and the heat flux increased extremely higher than the ordinary critical heat flux with microbubble emission. In periodic MEB, the bubble growth and collapse were repeated periodically in the channel. The heat fluxes in periodic MEB increased proportionally to the pressure frequency in the channel. The evaporation rates were roughly same values regardless of liquid subcooling and liquid velocity. The pressure frequency was considered as the number of liquid supply for one second.
