不同流道间隙下矩形通道临界热流密度的实验研究

在氟利昂工质条件下,进行1~3 mm间隙的矩形通道临界热流密度(CHF)的实验研究。研究发现,在1~3 mm间隙的矩形通道内,随着压力的升高,CHF稍有下降;质量流速对CHF的影响呈非单调关系,在低含汽率区随着质量流速的增大,CHF增大;在高含汽率区,随着质量流速的增大,CHF减小;临界含汽量的增加导致CHF明显降低。综合分析表明,在本实验工况参数范围内,流道间隙范围为1~3 mm的矩形通道在相同的工况参数条件下,其CHF基本不受流道间隙的影响。

Experimental Investigation of Critical Heat Flux in Rectangular Channels with Different Gap Sizes

Experiments on Critical Heat Flux(CHF) of Freon-12 have been carried out in the rectangular vertical channels with gap sizes of 1 mm,2 mm,and 3 mm,respectively.Analysis of CHF data in the different channels shows that CHF decreases as the increase of pressure,and while the exit quality rises,CHF falls down quickly.Meanwhile,CHF goes up as the mass velocity increases when the exit quality is lower,and contrarily,when the exit quality is higher,the increase of mass velocity results in the decrease of CHF.According to the analysis results,a conclusion can be drawn that gap sizes almost have no effect on the CHF in rectangular channels with gaps from 1 mm to 3 mm under the same condition in the experiment.