环形窄缝通道单相流动特性研究

对环形窄缝通道内单相流动特性进行了分析，提出了理论模型预测环形窄缝通道内单相流动阻力特性。根据该模型，对窄缝宽度分别为1.0、1.5、2.0mm环形通道内单相湍流流动摩擦阻力系数进行了理论计算，并与实验结果进行了比较。理论预测值与实验结果符合较好，且窄缝间隙大小对环形窄缝通道内流动特性有着重要影响，随着间隙的减小，摩擦阻力系数相应减小。间隙对流动阻力系数的影响还依赖于Re大小，其影响随Re的减小而降低。

Study on Flow Characteristics of Single-Phase Flow in Narrow Annular Channels

The characteristics of the single-phase flow in narrow annular channels were analyzed and theoretical model was proposed.Based on the present model,the theoreti- cal calculation was performed to predict the flow characteristics for the developed flow in narrow annuli with the gap sizes of 1.0,1.5 and 2.0 mm,respectively.The calculation results are in good agreement with experimental data.In addition,the gap size of the narrow annuli has great impact upon the flow characteristics.The decrease of the gap size reduces the friction factor.The higher the Reynolds number,the larger the effect of the gap size upon the friction coefficient during single-phase flowing through narrow an- nular channels.The effect of the gap size upon the friction coefficient depends on the Reynolds number,and will decrease with the decrease of the Reynolds number.