| 真空冷冻干燥机内的水蒸气压力分布计算 |
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| 引用本文： | 刘军,徐成海. 真空冷冻干燥机内的水蒸气压力分布计算[J]. 真空与低温, 2004, 10(1): 52-57 |
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| 作者姓名： | 刘军 徐成海 |
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| 作者单位： | 1. 东北大学,机械工程与自动化学院,辽宁,沈阳,110004;沈阳大学,师范学院,辽宁,沈阳,110015
2. 东北大学,机械工程与自动化学院,辽宁,沈阳,110004 |
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| 摘 要： | 试图从冻干过程中冻干室内水蒸气压力分布不均匀的角度,分析解释大型真空冷冻干燥机存在的不同部位物料干燥速率不均匀问题.通过建立描述搁板层间通道和搁板组间抽气通道内水蒸气流动的数学模型,计算得出流动通道内的水蒸气压力分布规律.定义了2个通道特征系数,反映出冻干机结构、工艺参数对水蒸气压力分布的影响作用.计算结果可以用于估算冻干机内不同部位物料的干燥速率,并可为确定冻干机关键结构工艺参数提供重要的理论参考依据.
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| 关 键 词： | 真空冷冻干燥 压力分布 模型 通道特征系数 |
| 文章编号： | 1006-7086(2004)01-0052-06 |
| 修稿时间： | 2003-06-17 |
DISTRIBUTION OF VAPOR PRESSURE IN THE VACUUM FREEZE DRYING EQUIPMENT |
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| LIU Jun. DISTRIBUTION OF VAPOR PRESSURE IN THE VACUUM FREEZE DRYING EQUIPMENT[J]. Vacuum and Cryogenics, 2004, 10(1): 52-57 |
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| Authors: | LIU Jun |
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| Abstract: | In the big vacuum freeze-drying equipment, the drying rate of materials is uneven at different position. This phenomenon can be explained by the unequal distribution of vapor pressure in chamber during the freeze-drying process. A mathematical model is developed to describe the vapor flow in the passageways between material plates and in the channel between plate groups. The distribution of vapor pressure along flow passageway is given. Two characteristic factors of passageways are defined to express the effects of structural and process parameters on vapor pressure distribution. The analysis conclusion can be used to estimate the difference of material drying rate at different parts in equipment and to direct the choice of structural and process parameters. |
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| Keywords: | vacuum freeze-drying distribution of vapor pressure model characteristic factor of passageway |
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