稀释水应用于匀浆辊流浆箱的数值模拟

为了确定匀浆辊流浆箱能否采用稀释水来调节纸页横幅定量偏差,文中采用计算流体动力学软件Fluent对匀浆辊流浆箱内的流场进行数值模拟,利用Multiphase-Mixture模型分析了两种流体在匀浆辊流浆箱中的混合情况,利用旋转坐标系统(RRF)模型考察流场内旋转域对流场的影响,计算在不同进浆流速和匀浆辊转速的情况下,稀释水的调节效果.模拟结果表明:稀释水的调节效果与匀浆辊转速符合一次函数关系.实验证明,采用稀释水调节后,横幅定量偏差降低了3个百分点以上,该结果与数值模拟结果相符,说明稀释水调节单元可用于匀浆辊式流浆箱.

Numerical Simulation of Dilution Water Applied to Headbox with Perforated Rolls

In the present study, the software of Computational fluid dynamics－Fluent was employed as the tool to simulate the flow inside of perforated roll-headbox. The multiphase model of Mixture was used to analyze the mixing of two kinds of liquid inside of perforated roll-headbox. The rotate reference frame (RRF) approach was used to simulate the rotating zone in flow field. The adjusting effect of dilution water in the conditions of different inlet speed and rotate speed of perforated rolls was evaluated. The simulation result showed the adjusting effect of dilution water has linear function to rotate speed of the perforated rolls. The experimental data indicated that the dilution water can adjust basic weight in CD and the effectiveness is above 3%. The experimental results accord well with the simulated ones. We considered the result of the present work is of significant theoretical value for the designing of headboxs with perforated rolls.