内分液结构调控竖直管间歇流型建模研究

马晓林; 徐进良; 谢剑; 邢峰; 程永攀

doi:10.6052/0459-1879-14-218

内分液结构调控竖直管间歇流型建模研究

doi: 10.6052/0459-1879-14-218

低品位能源多相流与传热北京市重点实验室, 华北电力大学, 北京 102206

基金项目: 国家重点基础研究发展计划项目(2011CB710703)和国家自然科学基金重大国际合作项目(51210011)资助.

详细信息

作者简介:
徐进良,教授,主要研究方向:微纳流动与传热;多相流动与传热. E-mail: xjl@ncepu.edu.cn

中图分类号: O359+.1
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- 被引次数: 0
出版历程
- 收稿日期: 2014-07-24
- 修回日期: 2014-12-09
- 刊出日期: 2015-01-18

MODEL RESEARCH ON MECHANISM OF MODULATED FLOW PATTERNS FOR VERTICAL UPFLOW

The Key Laboratory on Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China

Funds: The project was supported by the National Basic Research Program of China (2011CB710703) and the National Natural Science Foundation of China of International cooperation project (51210011).

摘要

摘要: 内分液流型调控管依靠微尺度网孔阻气通液的毛细力学特性,调控气液两相间歇流型以实现传热强化.基于Lockhart-Martinelli 分相模型以及Zuber-Findlay 漂移流动模型,建立描述内分液竖直管内流体动力特性的一维数学模型. 采用模型求解实验工况,计算结果与实验结果误差均在20% 以内. 计算发现,液速对流动现象起决定作用,而气速影响通过丝网的渗透程度. 在定性分析基础上,采用三角立方插值与最小二乘B 样条拟合获得了流动特性与气速、液速的定量函数关系. 据此得出结论,当Re_l < 693 7 时,一定出现第1 类工况;当Re_l > 693 7,且Re_g < 67 时,可能会出现第2 类工况,此时较低的气速会促进第2 类工况的出现. 根据建立的模型与拟合关系式可实现内分液调控管的优化设计.
- 流型调控 /
- 毛细力 /
- 竖直 /
- 分相模型 /
- 最小二乘
Abstract: Due to the fact that micropores prevent gas while pump liquid according to their capillary force characteristics, the tube with mesh construction inside is proposed to modulate flow patterns and enhance heat transfer. Based on Lockhart-Martinelli's separated flow model and Zuber-Findlay's drift model, one-dimensional mathematic model is built to describe the flow dynamic behaviors in vertical flow pattern modulated tube. The experimental conditions are solved by mathematic model and the relative errors between model predicted and experimental results are no more than 20%. It is noted that liquid velocity plays a more important role on flow phenomena than gas velocity while gas velocity influences the degree of penetration through the mesh. Based on qualitative analysis, cubic interpolation and least squares B-spline fitting are used to obtain the quantitative function relationship between flow phenomena and superficial velocity. It comes to the conclusion that when Re_l < 6937, there must be the first kind of condition, and when Re_l > 6937 with Re_g < 67, there can be the second kind of condition which is more likely to present at lower gas velocity. The mathematic model and quantitative function can contribute to the optimal design of flow pattern modulated tube.
- flow pattern modulation /
- capillary force /
- vertical /
- separated flow model /
- least squares

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