【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。更多还原

【Abstract】 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.更多还原