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Thermo-Hydraulics and Relaxation of Thermal Non-Equilibrium Two-Phase Flow

热非平衡两相流的热水力学和弛豫

基本信息

批准号：
04452325
负责人：
ARITOMI Masanori
金额：
$ 4.54万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452325/
关键词：
Boiling two-phase flow Thermo-hydraulics Relaxation of superheated water High conversion Light water reactors Reflooding Critical flow Interfacial transport phenomena Two-fluid model 高転換軽水炉熱的非平衡自己蒸発緩和現象気液界面熱伝達圧力損失ボイド率管

项目摘要

The purposes of this work are to offer a fundamental data base for next generation light water reactors and to sophisticate numerical codes for transient two-phase flow. The effect of channel gaps on thermo-hydraulics and the relaxation process of superheated water have been investigated experimentally and analytically. From the results, the following insights are clarified :(1) For a channel gap narrower than 2mm, thermo-hydraulics of boiling two-phase flow is influenced by channels gaps, and new correlations of boiling heat transfer, two-phase friction multiplier.(2) The drift flux model is applicable to analyze boiling two-phase flow in channels narrower than 2mm.(3) During reflooding phase in channels narrower than 2mm, quench velocity becomes much lower than a reflooding rate, and pressure drop becomes so higher than that in channels wider than 2mm.(4) Underpressure at the relaxation inception point of superheated water and time required for the relaxation inception can be evaluated by modified Jones'model.(5) Macroscopic relaxation inception is governed by interfacial area density and integration of the superheating by the time passing through the superheated region.(6) A new correlation of interfacial heat transfer is proposed and the two-fluid model including this correlation explains well the relaxation process and thermo-hydraulics of superheated water.

这项工作的目的是为下一代轻水反应堆提供基础数据库，并完善瞬态两相流的数字代码。通过实验和分析研究了通道间隙对热水力和过热水弛豫过程的影响。结果表明：(1) 对于窄于 2mm 的通道，沸腾两相流的热工水力受通道间隙以及沸腾传热、两相摩擦乘数的新关系影响。(2) 漂移通量模型适用于分析窄于 2mm 的通道中的沸腾两相流。(3) 窄于 2mm 的通道的再淹没阶段。 2mm时，淬火速度远低于再淹没速率，并且压降变得比宽于2mm的通道中的压降要高。（4）过热水弛豫起始点的负压和弛豫起始所需的时间可以通过修正的琼斯模型来评估。（5）宏观弛豫起始由界面面积密度和过热度与时间的积分决定。 (6)提出了一种新的界面传热关联式，包含该关联式的二流体模型很好地解释了过热水的弛豫过程和热工水力学。