中文摘要：

采用相位多普勒粒子分析仪对圆管内碳酸钠溶液的盐析湍流流动进行了研究．实验结果表明，随温度的降低，颗粒相的相对数密度及平均粒径值均呈上升趋势，15℃时平均粒径值由30℃时的40μm增至60μm以上，表明在过饱和度增加的情况下盐析晶体颗粒不断析出与生长；在相同温度下，液相脉动强度低于颗粒相，在接近壁面处受壁面的影响而减小，但颗粒相却是越接近边壁越大：在盐析流动过程中，湍流具有明显的各向异性：不同温度下两相平均速度沿水平方向基本呈对称分布，且液相平均速度均略大于颗粒相，二者速度差值在主流平均速度值的3％以内，仍可以把这种状态下的流动看成平衡流；同时随温度降低，颗粒相平均速度减小．

英文摘要：

A phase Doppler particle analyzer was used to measure salt precipitation turbulent flow of sodium carbonate solution under salt precipitation in a round pipe. Experimental results indicate that the relative count density and average diameter of particle phase show a climbing trend with temperature failing. And average diameter of particle phase increases from 40 μm to above 60 μm with the temperature from 30 ℃ to 15 ℃. The crystallized particles from salt precipitation are separated out and grow up continually when the supersaturation increases. The fluctuating intensity of liquid phase is lower than that of particle phase at the same temperature and falls down close to the wall surface, but that of particle phase becomes higher. The turbulence is obviously anisotropic during the course of salt precipitation flow. The average velocities of liquid and particle phases are symmetric basically along the horizontal direction at different temperatures. And the average velocity of liquid phase is slightly bigger than that of particle phase, the difference of average velocity between two phases is about 3% of mainstream velocity. Meanwhile, the average velocity of particle phase decreases with the temperature falling down.