水平管泡状流相分布特性

<正>气液两相泡状流的主要特征是连续液相中携带散布其中的细小气泡,气泡的存在不仅对气液两相流的传热、传质及阻力特性有很大的影响,而且对两相流动的稳定性也有很大的影响.前人有关泡状流的研究大多偏重于两相流的平均参数,对于两相流局部统计参数如局部空隙率等参数的变化规律是近年来两相流研究的新趋势.对于垂直管内的流动已经积累了相当数量的数据,而同样有广泛应用的水平管内相分布规律还知之甚少.气泡对气液两相流的传热、传质及流动结构影响机理的研究必须以了解相分布及气泡的局部统计参数为前提,同时对相分布特性的深人研究也为气液两相流的数学模型化提供实验依据.本文以空气、水为工质,研究水平管内气液两相流的相分布特性,给出了典型泡状流的时域信号图,研究了相分布随气液两相流量的规律变化,并与前人的有关结果进行了比较.

PHASE DISTRIBUTION IN HORIZONTAL GAS-LIQUID TWO-PHASE BUBBLY FLOW

An investigation on the phase distribution in air - water gas - liquid two - phase flow in a hor-(?)ontal circular channel was conducted by using the double - sensor resistivity probe. The typical time se-ries signal of the probe were presented. The variations of phase distribution with variations of gas and liquid volumetric fluxes were analyzed and the present data were compared with prior work data and existing models. It was found that there exists a more complex phase distribution pattern in horizontal flow system than in vertical flow. The radial local void fraction profiles have a similarity at the same measuring angle with different gas and liquid flow rates. However, a non - symmetric profile can be observed at a given slice of pipe cross - section except along the horizontal axis of the pipe .