Two kinds of thermodynamics quality at onset of nucleate boiling with subcooled boiling were calculated for force circulation by using Bergles and Rohesenow method or Davis and Anderson method,and natural circulation by using Tsinghua University project group s empirical equations suggested in our natural circulation experiment at same condition.

Experimental investigation on the subcooled boiling heat transfer was carried out in a vertical up-flow double narrow annulus with 1.

Several models for calculating the initial points of subcooled boiling were introduced.

The anal-ysis shows:①Sub-cooled boiling,condensation and flashing play an important role on the flow instabil-ities in a natural circulation system,and have connection with lots of instabilities,which is different to the forced ci.

Characteristic study of highly subcooled boiling in the 5MW nuclear heating reactor;

Experimental study on vapor-liquid-solid three-phase flow boiling heat transfer of ethanol-water binary mixtures in a vertical tube was carried out.

To make clear the characteristics of bubble formation, coalescence and deformation in the narrow annular channel, a visible flow boiling heat transfer experiment has been carried out in vertical narrow annuli with inner side heating.

An experimental study on the flow boiling heat transfer and its visualization of water in a rectangular micro-groove horizontally laid;