窄通道内水沸腾换热的数值模拟研究

Here in the research we discussed the boiling heat transfer in three kinds of vertical narrow channels on fluent，the length of them is 100mm while the width are 2mm，5mm and 10mm．In condition that Gravity，Surface tension and the roughness of the surface have been taken into consideration，the research simulated boiling process in narrow channels and explored how the width of the channel influences onset of nucleate boiling，the import and export pressure difference，average temperature of the outlet and the average surface heat transfer coefficient． It was found that a narrower channel has a higher export temperature and average surface heat transfer coefficient，an earlier ONB．It proves that a narrow channel has an advantage of strengthen heat transfer，and a little roughness is in favor of boiling heat transfer．