| 小管径冷凝管的数学模型 |
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| 引用本文： | 柏立战,林贵平.小管径冷凝管的数学模型[J].北京航空航天大学学报,2009,35(6):665-668. |
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| 作者姓名： | 柏立战 林贵平 |
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| 作者单位： | 北京航空航天大学航空科学与工程学院,北京,100191;北京航空航天大学航空科学与工程学院,北京,100191 |
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| 基金项目： | 国家自然科学基金资助项目(50676006);;航空基金资助项目(2007ZC09) |
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| 摘 要： | 基于环状流流型建立了小管径冷凝管的数学模型.模型考虑了气液界面表面张力的作用,在同一横截面上气相与液相存在压力差.对两相压降的计算,考虑了气液两相间的相互作用,包括摩擦切应力和动量转移切应力.应用该模型,可考察气相与液相压降、液膜厚度、气相与液相平均速度、气液界面切应力以及管内壁换热系数等的沿程变化情况.根据模拟结果可得:两相压降沿管长呈近似线性增加;气相平均速度沿管长先增大后逐渐减小,但变化范围很小,且远大于液相平均速度;动量转移切应力随液膜厚度增加而增大,同摩擦切应力相比不可忽略;管内壁对流换热系数随液膜厚度增加而减小,由于冷凝管的管径很小,即使蒸气冷凝趋于完毕,气液界面接近冷凝管中心线,换热系数仍较大.
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| 关 键 词： | 冷凝管 模拟 压降 传热 |
| 收稿时间： | 2008-05-26 |
Mathematical model of small diameter condenser pipes |
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| Bai Lizhan,Lin Guiping.Mathematical model of small diameter condenser pipes[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(6):665-668. |
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| Authors: | Bai Lizhan Lin Guiping |
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| Institution: | School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | Based on the annular flow pattern,the mathematical model of condenser pipes with small diameters was established.The effect of surface tension on the liquid/vapor interface causing the pressure difference between liquid and vapor phases on the same cross section and the interaction between the liquid and vapor phases including the frictional and momentum-transfer shear stresses were considered in the model.The variations of the liquid and vapor phase pressure drops,the thickness of the liquid film,shear str... |
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| Keywords: | condenser simulation pressure drop heat transfer |
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