Mechanism and Effects of Predominant Parameters Regarding Limitation of Falling Water in Vertical Countercurrent Two-Phase Flow
Mechanism and Effects of Predominant Parameters Regarding Limitation of Falling Water in Vertical Countercurrent Two-Phase Flow
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垂直逆流两相流落水限制主要参数的机理及影响
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Y. Sudo
中科院分区：
文献类型：
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作者：
Y. Sudo
在这项研究中，为了阐明逆流限制（CCFL）或洪水的机制，即逆流两相流在垂直通道中下降的水质量通量的限制，并确定了主要参数对CCFL的影响，采用了一个包络动量方程来给出CCFL条件的判据，该条件适用于任何空隙率的整个通道长度。结果发现，所提出的分析模型能够充分预测本研究中研究的所有现有实验结果。在通道构型中，圆形、矩形、环形或平面通道、通道直径尺寸、间隙大小、宽度或周长、长度、界面和壁面摩擦、注水方式和进水过冷度是主要参数。因此，CCFL的机制和定量效应已经被确定。
In this study, an investigation was carried out to clarify the mechanism of countercurrent flow limitation (CCFL) or flooding, that is, limitations in the falling water mass flux in countercurrent two-phase flow in vertical channels, and to identify the effects of predominant parameters regarding CCFL, adopting the criterion that the CCFL condition be given by an envelope of momentum equation applied for the entire length of the channel with respect to any void fraction. As a result, it was found that the analytical model proposed could adequately predict all existing experimental results investigated in this study. In the channel configuration, circular, rectangular, and annular or planar channels, channel dimensions of diameter, gap size, width or circumference, and length, interfacial and wall friction, water injection mode, and inlet water subcooling were dominant parameters. Therefore, both the mechanism and the quantitative effects of CCFL have been identified.