中强脉冲电场叉指式平板处理室的多物理场仿真与试验  

Multi-physical field simulation and experiments of parallel treatment chamber with interdigital structure under moderate intensity pulsed electric fields

作　　者：王思敏 甘芝霖 孙爱东[1,2] 孙铭爽 WANG Simin;GAN Zhilin;SUN Aidong;SUN Mingshuang(College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083,China;Beijing Key Laboratory of Forest Food Processing and Safety,Beijing 100083,China;College of Food Science,Northeast Agricultural University,Harbin 150030,China)

机构地区：[1]北京林业大学生物科学与技术学院,北京100083 [2]林业食品加工与安全北京市重点实验室,北京100083 [3]东北农业大学食品学院,哈尔滨150030

出　　处：《中国农业大学学报》2022年第10期186-195,共10页Journal of China Agricultural University

基　　金：国家自然科学基金面上项目(31871817,32172222)。

摘　　要：处理室是脉冲电场系统的关键部件,为改善处理室的结构和性能,设计并优化一种在中强脉冲电场下的处理室。运用COMSOL Multiphysics软件对优化前后处理室的电场、流场和温度场进行分析,测定物料出口温度和杀菌效果对优化效果进行实际评价,基于优化后的处理室对比中强脉冲电场处理和巴氏杀菌处理对蓝莓果汁的品质影响。结果表明:1)研究得到的直角型叉指式平板处理室,除电极拐角处存在电场尖峰外,其他区域的电场强度分布均匀,均为2kV/cm,与理论值相同,优化后的圆角型叉指式平板处理室在拐角处消除了电场尖峰,电场强度峰值由22.7kV/cm降低至2.64kV/cm,电场强度分布更加均匀,物料出口温度降低了4.3℃,温度和流速分布均得到改善;2)基于叉指式平板处理室搭建的中强脉冲电场处理系统具有显著的杀菌效果,电场强度大于2kV/cm时,直角型和圆角型叉指式平板处理室均使大肠杆菌菌落数下降了3lg(CFU/mL)以上,但圆角型叉指式平板处理室的物料温度升高幅度显著降低,效果更好,与仿真结果一致;3)与热处理相比,中强脉冲电场处理更好地保持了蓝莓果汁的pH、颜色、花色苷和抗氧化能力。本研究研发的叉指式平板处理室具有良好的杀菌效果,优化后物料温升更小,能够较好地保持蓝莓果汁的品质。Treatment chamber is the key equipment of the pulsed electric field system.To develop the structure and performance of the treatment chamber,a type of treatment chamber under moderate intensity pulsed electric fields(MIPEF)was designed and optimized.COMSOL Multiphysics software was used to analyze the electric field,flow field,and temperature field of the treatment chamber before and after optimization.The practical effects were evaluated by measuring material outlet temperature and sterilization effect.Based on the optimized treatment chamber,the effects between MIPEF treatment and pasteurization treatment on the quality of blueberry juice were compared.The results showed that in the right-angled type of interdigital parallel treatment chamber obtained by this study,except for the sharp electric fields at the corners of the electrodes,the electric intensity distribution was uniform in other areas with the theoretical value of 2kV/cm.The corner-filleted type of interdigital parallel chamber after optimized showed a more uniform electric intensity distribution that the peak electric intensity was declined from 22.7kV/cm to 2.64kV/cm with the sharp electric fields eliminated around the corners,and the material temperature at the exit was reduced by 4.3℃with the temperature and velocity distributions improved.Significant sterilization effects were obtained by the MIPEF processing systems built with the interdigital parallel treatment chambers,and more than 3lg(CFU/mL)reduction of E.coli was observed when the electric intensity was more than 2kV/cm both in the right-angled and the corner-filleted type of interdigital parallel treatment chambers.However,a better effect was observed that a smaller increment of material temperature was acquired in the corner-filleted type of interdigital parallel chamber,which was consistent with the simulation results.Compared to heat treatment,MIPEF treatment better kept the pH,color,anthocyanin,and antioxidant capability of blueberry juice.Therefore,the interdigital parallel treatm

关 键 词：平板式处理室 杀菌 叉指结构 中强脉冲电场 COMSOL Multiphysics 

分 类 号：TS203[轻工技术与工程—食品科学]