圆盘反应器液膜表面更新数值模拟

Numerical simulation of surface renewal frequency on vertically rotating disc

以圆盘反应器的开发和放大为背景,通过理论分析将液膜更新频率与液膜变形相关联,运用VOF模型研究竖直旋转圆盘液膜更新频率空间分布特性;将量纲分析与数值模拟相结合考察影响普通圆盘液膜平均更新频率的相关因素;从表面更新的角度研究自由膜与附壁膜的差异,优化圆盘结构。结果表明:圆盘表面液膜加速区液膜更新频率最快,较其他区域高150%,较平均值高75%;获得了普通圆盘液膜平均更新频率表达式;圆盘开窗形成自由膜,更新频率比附壁膜高40%以上;相同面积圆形窗区域自由膜更新频率比扇形窗自由膜高34%,但是扇形窗自由膜对附壁膜强化作用更明显。

The surface renewal in rotating disc reactor was investigated by using CFD. The liquid film surface renewal frequency was associated with the rate of film deformation. The spatial distribution of film surface renewal frequency was studied with the volume of fluid method. Based on the investigation of main factors influencing average renewal frequency, a correlation equation was presented. The difference of surface renewal frequency between free film and wall-bounded film was also investigated. The renewal frequency of the accelerating region was the fastest, about 150% faster than other regions and 75% faster than the average. An expression of renewal frequency was obtained. The renewal frequency of the free film was 40% faster than that of the wall-bounded film. The renewal frequency of the free film on round window was 34% faster than the fan-shaped free film, but the fan-shaped free film could intensify the wall-bounded film significantly.