螺旋藻细胞冷冻过程微尺度传热传质特性  

Micro-scale heat and mass transfer characteristics of sipirulina platensis cell during freezing

作　　者：彭润玲[1] 徐成海[1] 李全顺[1] 刘长勇[2] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110004 [2]沈阳理工大学机械工程学院,沈阳110168

出　　处：《低温工程》2006年第4期63-68,共6页Cryogenics

基　　金：2004年沈阳市科委计划项目(040656)

摘　　要：为了探索保持螺旋藻活性的最佳冷冻条件,研究了冷冻过程凝固界面和螺旋藻细胞之间相互作用的物理现象,在考虑细胞和冰界面之间的耦合传热传质、膜的传输特性和凝固界面的移动过程的情况下,建立了螺旋藻细胞冷冻过程冰界面与细胞之间相互作用的数学模型,检查了螺旋藻细胞被冰界面包围过程的温度场和浓度场,研究了螺旋藻细胞被冰界面包围过程中细胞体积的收缩情况及影响因素。计算结果表明,膜的渗透性和冷却速率是影响细胞体积收缩的主要因素。该模型可优化减小螺旋藻细胞损伤的最佳冷冻条件。In order to search optimum cooling condition for the survival of sipirulina platensis cell, the physics of interaction of ice to sipirulina platensis cell during freezing were studied by a numerical method. The numerical simulation of sipirulina platensis cell＇ s response to the ice front was developed with the heat transfer, mass diffusion, membrane transport and evolution of the solidification front were considered during freezing. The temperature and concentration fields both inside and outside a cell were computed and the characteristics of cell volume response to an advancing ice front were studied. The results indicate membrane permeability and cooling rate are main factors that affect the cell shrinkage. This model can be used to optimize the cooling rate for reducing damage to sipirulina platensis cell

关 键 词：冷冻 传热传质模型 微尺度温度场 浓度场 细胞体积收缩率 

分 类 号：TB69[一般工业技术—制冷工程] Q-331[生物学]