Experimental study was performed using water as working medium to investigate the flow instability in a vertical narrow annuli with both subcooled and saturated boilings.

以水为工质,分别在过冷条件下对竖直窄环隙流道行了自然对流沸腾流动不实验,观测到了窄隙流道沸腾时所特有的蒸干型流动不。