Flow of a wood pulp suspension through sudden expansion ducts and dispersion control of a high-consistency pulp-fibers

对木浆悬浮液在造纸机水力流浆箱中的流动进行了实验研究。在实验中，我们研究了三个突然膨胀管道中的流动特性，并考察了膨胀率和流量对纸浆纤维行为的影响。对不同浓度的纸浆悬浮液，给出了时均浓度分布的变化和浓度沿管道轴线沿着的波动。此外，我们还讨论了纤维浓度的不均匀程度。研究结果为造纸机流浆箱的改进和优化提供了基础数据。

An experimental investigation of the flow of wood pulp suspensions in a modeled hydraulic headbox of papermaking machines was performed. In the experiments, we investigate the flow characteristics in three sudden-expansion ducts and examine the influences of the expansion ratio and the flow rate on the behavior of the pulp fibers. The changes in the distributions of time-averaged concentration and the fluctuations of the concentration along the duct axis are illustrated for the pulp suspensions with various concentrations. Moreover, we discuss the degree of nonuniformity of the fiber concentration. The results obtained from this study are useful basic data and are expected to contribute to improving and optimizing headbox of the papermaking machines.