| 加热方式对真空冷冻干燥热质传递机理的影响 |
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| 引用本文： | 杜小泽,齐锡龄,王补宣. 加热方式对真空冷冻干燥热质传递机理的影响[J]. 工程热物理学报, 1997, 0(5) |
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| 作者姓名： | 杜小泽 齐锡龄 王补宣 |
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| 作者单位： | 清华大学热能工程系!北京100084(杜小泽，王补宣)，天津大学热能工程系!天津300072(齐锡龄) |
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| 摘 要： | 1引言真空冷冻干燥（简称真空冻干）是多孔介质在低温低压下相变界面移动的耦合传热传质过程，其数学模型带有典型的非线性，难于精确求解［‘，2］。从应用上而言，真空冻干具有设备投资高，能耗大，干燥时间长的缺点。能量的供应即加热方式、升华水汽的流动条件、物料的输运性质是影响真空冻干性能的主要因素间。本文以牛肉的真空冷冻干燥过程为例，建立过程的非稳态数学模型，利用数值求解的结果，结合实验分析，研究了通过千层的辐射加热和通过冻结层的导热加热条件下真空冻干过程中传热传质的机理，分析了加热方式对缩短干燥时间的影响…
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| 关 键 词： | 冷冻干燥 传热传质 加热方式 |
INFLUENCE OF HEATING METHODS ON HEAF AND MASS TRANSFER DURING VACUUM FREEZE-DRYING |
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| DU Xiaoze QI Xiling WANG Buxuan. INFLUENCE OF HEATING METHODS ON HEAF AND MASS TRANSFER DURING VACUUM FREEZE-DRYING[J]. Journal of Engineering Thermophysics, 1997, 0(5) |
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| Authors: | DU Xiaoze QI Xiling WANG Buxuan |
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| Abstract: | This paper establishes a unsteady mathematic model of freeze drying process. Analysis of the numerical results of the model indicates that different heating methods lead to different laws of energy's disturbation in increasing the temperature of the products and in sublimating the ice. Also the influence of heating methods on reducing the drying time is studied. The numerical results agree well with the experimeni. |
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| Keywords: | freeze drying heat and mass transfer heating methods |
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