| 初乳真空冷冻干燥传热传质系数测定与分析 |
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| 引用本文： | 李云飞,王成芝.初乳真空冷冻干燥传热传质系数测定与分析[J].农业机械学报,1997,28(2):96-100. |
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| 作者姓名： | 李云飞 王成芝 |
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| 作者单位： | [1]华东工业大学动力工程学院制冷研究室 [2]东北农业大学工程学院 |
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| 摘 要： | 应用准稳态传热传质理论，在考虑水蒸气扩散对传热作用情况下，分别建立了奶牛初乳在真空冷冻干燥中多孔干燥层有效导热系数，冻结层导热系数和水蒸气扩散系数的测试模型，利用在冻干机上测取的试验数据，回归得到初乳的传热系数与水蒸气扩散系数，分析了压力与系数间的关系，结果表明，在１０Ｐａ～１２０Ｐａ范围内，干燥层有效导热系数随压力增大而增加，尤其在１０Ｐａ～６０Ｐａ范围内更为明显，而水蒸气扩散系数随压力的改变变
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| 关 键 词： | 初乳 干燥 传热 传质 乳制品 |
MEASUREMENT AND ANALYSIS OF COEFFICIENTSOF HEAT AND MASS TRANSFER FOR FREEZE DRYING OF BOVINE COLOSTRUM |
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| Li Yunfei.MEASUREMENT AND ANALYSIS OF COEFFICIENTSOF HEAT AND MASS TRANSFER FOR FREEZE DRYING OF BOVINE COLOSTRUM[J].Transactions of the Chinese Society of Agricultural Machinery,1997,28(2):96-100. |
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| Authors: | Li Yunfei |
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| Institution: | Li Yunfei (East China University of Technology) Wang Chengzhi (Northeast Agricultural University) |
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| Abstract: | The model of coefficient including the effect of water vapor diffusion on heat transfer was developed based on quasi steady heat and mass transfer theory. The heat transfer coefficients of porous dried layer and frozen layer, the diffusivity of mass transfer were regressively derived from experimental data. The results showed that the pressure from 10 Pa to 120 Pa had a significant effect on the heat transfer coefficient of porous dried layer, especially from 10 Pa to 60 Pa. On the other hand, it had little effect on the diffusivity of mass. |
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| Keywords: | Colostrum Drying Heat transfer Mass transfer |
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