壁面滑移条件对豆渣螺杆挤压混合性能的影响  

Effects of wall slip conditions on mixing performance in okara screw extrusion

作　　者：吕磐 伍娟[2,3] 程宇[1,2,3] 马海乐[1,2,3] LYU Pan;WU Juan;CHENG Yu;MA Haile(Faculty of Agricultural Engineering,Jiangsu University,Zhenjiang 212001,China;School of Food and Biological Engineering,Jiangsu University,Zhenjiang 212001,China;Institute of Food Physical Processing,Jiangsu University,Zhenjiang 212001,China)

机构地区：[1]江苏大学农业工程学部,江苏镇江212001 [2]江苏大学食品与生物工程学院,江苏镇江212001 [3]江苏大学食品物理加工研究院,江苏镇江212001

出　　处：《包装与食品机械》2025年第2期39-49,共11页Packaging and Food Machinery

摘　　要：针对豆渣的双螺杆挤压仿真因忽略壁面滑移,而导致与实际不符的问题,采用广义Navier滑移准则对豆渣的混合性能进行仿真。基于Polyflow软件,以停留时间分布、分离尺度和最大剪切应力为指标,探究螺杆类型和转速对混合性能的影响,并通过试验对染色豆渣颜色分布的均匀性进行验证。仿真结果表明,无滑移时,物料在混炼块螺杆停留时间最短,为3~8 s,剪切应力稳定在4×10^(-6)-6×10^(-6) Pa;滑移条件使停留时间扩展至8~30 s;反向螺纹120 r/min时,停留时间图像呈双峰分布,削弱混合均匀性,但混炼块仍保持最快的混匀时间和6×10^(-6)-8×10^(-6) Pa的高剪切应力。验证试验表明,混炼螺杆挤出的物料颜色互嵌分布,R像素标准差为22.89,颗粒细化效果显著,与仿真结论一致。研究为双螺杆挤压工艺的优化提供理论支撑。To resolve the simulation deviation in twin-screw extrusion of okara caused by neglecting wall slip,this study applied the generalized Navier slip criterion to simulate its mixing performance.Using Polyflow software,the effects of screw type and rotation speed on mixing were analyzed through residence time distribution(RTD),mixed statistics,and maximum shear stress.Experimental validation was performed by assessing color distribution uniformity in dyed okara.Simulations showed that under no-slip conditions,materials in kneading blocks had the shortest RTD(3~8 s)and stable shear stress(4×10^(-6)-6×10^(-6)Pa).Wall slip extended RTD to 8~30 s.At 120 r/min with reverse-threaded screws,the RTD exhibited a bimodal distribution,reducing mixing uniformity,though kneading blocks maintained the fastest homogenization time and higher shear stress(6×10^(-6)-8×10^(-6)Pa).Validation tests confirmed interlaced color distribution in extrudates,with an R-pixel standard deviation of 22.89 and significant particle refinement,aligning with simulation results.This research offers theoretical insights for optimizing twin-screw extrusion processes.

关 键 词：豆渣 螺杆挤压 仿真 壁面滑移 混合统计 

分 类 号：TS203[轻工技术与工程—食品科学]