不同形状果蔬速冻时辅助磁场位置的研究  

Study on the Location of Magnetic Field Assisting in Freezing Vegetables with Difformity

作　　者：李天颖 刘斌[1] 宋健飞 吴子健[2] LI Tian-ying;LIU Bin;SONG Jian-fei;WU Zi-jian(College of Mechanical Engineering,Tianjin University of Commerce,Tianjin Key Laboratory of Refrigeration Technology,Tianjin 300134,China;College of Biotechnology and Food Science,Tianjin University of Commerce,Tianjin Key Laboratory of Food Biotechnology,Tianjin 300134,China)

机构地区：[1]天津商业大学机械工程学院天津市制冷技术重点试验室,天津300134 [2]天津商业大学生物技术与食品科学学院天津市食品生物技术重点试验室,天津300134

出　　处：《食品研究与开发》2018年第17期193-196,208,共5页Food Research and Development

基　　金：2017国家重点研发计划重点专项(2017YFD0401305);天津市武清区科技发展项目(WQKJ201633)

摘　　要：在磁场辅助冻结果蔬时,磁场位置即预冷时间的确定至关重要。通过对蔬菜速冻过程中热量传递过程的分析,建立切成立方体的胡萝卜与马铃薯、类球形的豌豆和类圆柱的西兰花预冷过程的多维分析解模型和集中参数法模型,并进行试验验证。结果表明,多维分析解的模型可较好地预测胡萝卜、马铃薯和豌豆的预冷时间,进而确定辅助磁场的位置;以R为特征长度的集中参数模型对西兰花的预测较为准确。研究结论为不同几何体的果蔬在速冻机中的预冷时间即磁场位置的确定提供理论基础,保证试验的准确性和可重复性。It＇s important to confirm the precooling time,namely the location of the magnetic field,which was used to assist in freezing vegetables, The models of the multidimensional analysis solution and the lumped parameter method were set up to estimate the precooling time of the carrot and potato cut into cube,near spherical pea and quasi cylindrical broccoli, and were confirmed by the experiment, The results showed that the multidimensional analysis model could estimate the time properly for the carrot,potato and pea so as to determine the positions of the magnetic field, and for the broccoli ,the lumped parameter method adopting the characteristic length R was better, This work provides the theory basis for the precooling time of the three geometric bodies in the instant freezer and ensures the accuracy and repeatability of the experiment,

关 键 词：磁场辅助冻结 磁场位置 传热分析 果蔬 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程]