冰浆水平直管非均匀输运特性研究

通过建立CFD-PBM耦合模型,研究含冰率与流速对水平直管内冰浆的冰晶体积分数与粒径的分布规律,着重分析了冰浆管内非均匀流动过程的输运特性。研究结果表明:含冰率对冰晶体积分数及粒径演化有显著影响,含冰率越高,冰晶体积分数越大,冰晶平均粒径越大;而流速对冰晶体积分数分布的影响主要在于近壁面区,流速增大主流区的冰晶体积分数几乎不变,而近壁面处冰晶体积分数则有所下降;随着流速的增加,冰晶粒径增大,但增加的速率逐渐下降。

Study on Non-Uniform Transport Properties of Ice Slurry Horizontal Straight Tubes

A CFD-PBM (computational fluid dynamics-population balance model) coupling model has been established to study the effects of ice packing factor and flow velocity on the ice volume fraction (IVF) and particle size distribution (PSD) in horizontal straight tubes, followed by an analysis of the transport properties of heterogeneous flow in ice slurry pipes. The results show that the ice content has a significant effect on the ice volume fraction (IVF) and particle size distribution (PSD): the higher the ice content is, the bigger the ice volume fraction (IVF) will be, and the bigger the particle size distribution (PSD) will be as well. The main effect of the flow velocity on the IVF distribution mainly focuses on the regions near the wall of pipes. While the ice volume fraction (IVF) in the mainstream almost remains unchanged, the ice volume fraction (IVF) near the wall region decreases. With the increase of velocity, the size of ice crystals increases, while the increasing rate of ice crystals decreases.