非绝热条件下冰浆管内流动特性研究

Research on flow characteristics of ice slurry in pipe under nonadiabatic condition

将过冷水法制取冰浆的工作原理结合多相流欧拉模型和相间传热传质模型,使用Fluent软件模拟非绝热条件下冰浆在出冰管道的流动情况,管道模型包括水平直管和90°弯管.在初始含冰率为1%~10%范围内,结合两种管内冰堵判断依据,研究冰晶粒径、管径、管长、曲率半径等参数对两种临界流速的影响.结果表明:冰晶粒径和直管管长产生的影响较强,两种临界流速呈现显著上升趋势,其中对临界流速一的影响更为明显;管径产生的影响较弱,两种临界流速呈现微弱增长趋势,且增长率趋于平缓,变化范围为0.02~0.07 m/s;弯管曲率产生的影响微弱,两种临界流速呈现微弱下降趋势,变化范围为0.01~0.03 m/s.

The working principle of supercooled water method for preparing ice slurry was combined with multiphase flow Euler model and interphase heat and mass transfer model,and Fluent software was used to simulate the flow of ice slurry in ice slurry outlet pipeline under nonadiabatic conditions.The pipe model included horizontal straight pipe and 90°elbow.In the range of 1%~10%of the initial ice packing fraction,combined with two kinds of judgment basis of ice blockage in pipe,the influence of parameters such as ice particle size,pipe diameter,pipe length and curvature radius on the two critical velocities were studied.Results show that the influence of ice particle size and straight pipe length is strong,and the two critical velocities exhibit a significant upward trend,especially on the critical velocity I.The influence of pipe diameter is weak,the two critical flow velocities exhibit a tiny growth trend,and the growth rate tends to be flat,with a variation range of 0.02~0.07 m/s.Bend curvature has a little effect on critical velocities,and the two critical velocities exhibit a slight downward trend,with a variation range of 0.01~0.03 m/s.