基于VOF模型的层叠器流动过程分析及流道结构优化

基于FLUENT软件的流体体积(VOF)模型研究了不同壁面滑移程度以及不同流道结构参数下4层等厚熔体通过层叠器倍增为8层熔体时,流道中熔体的分层情况变化。结果表明,壁面滑移程度的降低会促使熔体在上下壁面聚集,进而导致上下壁面处熔体层厚增加;汇流段与出口段间圆角半径、汇流段扩压角和平衡段长度这3个结构参数则只会影响熔体在左右壁面的聚集,进而影响各层熔体的尺寸精度,且其中扩压角的影响程度最大,平衡段长度次之,圆角半径的影响较小。

Flow Process Analysis and Channel Structure Optimization of Laminator Based on VOF Model

Based on the FLUENT software,the VOF model was adopted to study the changes of the melt delamination in the flow channel when the four-layer melt was multiplied to the eight-layer one by a laminator under different wall slip degrees and flow channel structure parameters.The analysis results indicated that the reduction of the degree of wall slip led to the accumulation of the melt on the upper and lower wall surfaces.This led to an increase in thickness of the melt layer at the upper and lower wall surfaces.The three structural parameters of fillet radius between the confluence section and the exit section,expansion angle of the confluence section and length of the equilibrium section only affected the accumulation of the melt on the left and right wall surfaces and therefore inflenced the dimensional accuracy of the melt in each layer.The influence of the angle was most signficant,followed by the length of equilibrium section.However,the influence was least from the radius of the fillet.