【摘要】 以氮气和水为工质,在水平矩形小通道(dh=0.99mm)中对两相流摩擦压降和流型进行了实验研究。实验在大气压力下进行,氮气的折算流速的范围为0.017~33.3m/s,水的折算流速的范围为0.1~5m/s。对实验所得的219个数据点进行分析,并与L&M关系式、H&S关系式(修正了C值的L&M关系式)、均相流模型以及均相流修正模型进行了比较。得出:(1)L&M关系式比均相流模型、均相流修正模型以及H&S关系式的偏差都小,能更好地预测两相流压降变化。(2)L&M关系式中的C在不同的流型(流型是由UGS、ULS以及dh决定)具有不同的值,在同一ULS下,C随X(UGS)的变化呈现一定的规律性,在X=7左右,C出现最大值,而此处恰好是块状流最激烈区域。但是C随ULS没有一定的规律性。同时,通过可视化方法(高速摄像仪)和压差波动相结合的方法初步确定了各个流型的范围。更多还原

【Abstract】 Two-phase frictional pressure drop and flow regimes in small channels were experimentally investigated.Using nitrogen and water,experiments were conducted in small horizontal rectangular channels with 0.99mm inner diameter.The gas and liquid superficial velocity ranges were 0.017～33.3 and 0.1～5m/s,respectively.The atmospheric pressure condition was maintained throughout the experiments.There are two conclusions:（1） Comparisons between the experimental data and the predictions indicate that the L&M model shows a better predictive ability than the other empirical correlations.（2） In the case of the same U_LS,the parameter C shows a regular relation with parameter X(U_GS) and reaches a maximal value at X=7,where churn flow existed.But there is no regular relation between C and U_LS.At the same time,by the means of combination of high-speed camera and pressure signal fluctuation,flow regimes in the small channels were identified.更多还原