实验表明 ,狭缝间隙对液氮自然对流核态沸腾换热有明显的影响。在低热流密度下 ,间隙小的狭缝沸腾换热比间隙大的狭缝明显增强。当狭缝间隙小于实验压力下气泡的脱离直径时 ,对于同样的热流密度 ,传热温差减小一个数量级以上 ,沸腾换热系数提高十几倍到二十倍以上 ,当热流密度增加一定程度( >4W/cm2 )时 ,间隙小的狭缝沸腾换热比间隙大的狭缝有所减弱 Experiments show that the slit gap has a significant effect on the natural convection nucleate boiling heat transfer. At low heat flux density, slits with small interspaces boil and heat transfer significantly increases compared to slits with large interspaces. When the slit gap is smaller than the desorption bubble diameter under the experimental pressure, the heat transfer temperature difference decreases more than one order of magnitude and the boiling heat transfer coefficient increases more than ten times to twenty times for the same heat flux density. When the heat flux density increases to some extent > 4W / cm2), the slit having a small clearance boils and the heat transfer of the slit is weaker than the slit having a larger clearance