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Thermo-Hydraulic Behavior of Inverted Two-Phase Flow

倒置两相流的热水力行为

基本信息

批准号：
61580190
负责人：
ARITOMI Masanori
金额：
$ 1.28万
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 (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61580190/
关键词：
Inverted Two-phase Flow Inverted Annular Flow Boiling Two-Phase Flow Heat transfer Pressure drop Thermally non-equilibrium state Subcooled liquid 過熱蒸気二相流熱的非平衡軽水炉の安全性

项目摘要

Inverted two-phase flow was investigated experimentally in vertical and horizontal flow channels with various diameters using Freon 113 as a test fluid.The folloving are clarified:(1) Inverted two-phase flow has three flow regimes, which are inverted annularflow, liquid slug flow and superheated dispersed flow.(2) Inverted annular flow appears in the region where thermally equilibrium quality is less than zero, liquid slug flow occurs in the region where it is between zero and 0.1, and superheated despersed flow is formed in the region where it is more than 0.1.(3) Superheated dispersed flow is the same as the one under post-dryout conditions.(4) Nusselt number of liquid slug flow coincides the one of inverted annular flow at zero quality, increases linearly as increasing the thermally equilibrium quality and is proportion to the square of Reynolds number.The thermo-hydraulic behavior under thermally non-equilibrium conditions has never been understood in the constitute equations for n … More umerical analysis of transient two-phase flow, which is important for safety analysis of light water reactors. Inverted annular flow has thermally large non-equilibrium state in the same flow cross section where subcooled liquid and superheated vapor exit. Therefore, inverted annular flow was taken up secondly to produce the fundamental data base on the thermo-hydraulic behavior under thermally non-equilibrium conditions and to model it.From these results, the following are clarified:(5) Nusselt number of inverted annular flow is proportion to 0.35th of Reynolds number for the horizontal flow but is independent of it for the vertical flow.(6) Nusselt number of the horizontal flow decreases exponentialy as increasing wall superheating and thermally equilibrium quality. As increasing the flow diameter, the absolute values of the power concerning superheating increases but the one concerning thermally equilibrium quality decreases.(7) The fundamental data base on vapor film thickness is produced, which is very important for modeling mass, energy and momentum transfer from the interface. The empirical correlation of the thickness is proposed.(8) The frictional multiplier of inverted annular flow to liquid single phase flow is not correlated by the ratio of the vapor film thickness to the flow diameter but by the thickness. The multiplier is less than 1 lor the thickness less than 0.4mm. Less

以氟里昂113为试验流体，在不同直径的垂直和水平流道中对两相反相流进行了实验研究，得到以下结论：（1）两相反相流有三种流型：反相环状流、液弹流和过热分散流。(2)在热平衡干度小于零的区域内出现反向环状流，在热平衡干度为0 ~ 0.1的区域内出现液弹流，在热平衡干度大于0.1的区域内形成过热环状流。(3)过热分散流与干燥后条件下的相同。(4)液弹流的Nusselt数与零干度下的倒环状流的Nusselt数一致，随热平衡干度的增加而线性增加，并与雷诺数的平方成正比。 ...更多信息瞬态两相流的数值分析对轻水堆的安全分析具有重要意义。在过冷液体和过热蒸汽出口处的同一流动截面上，反向环状流存在大的热不平衡状态。因此，本文首先对反环流进行了研究，为热非平衡条件下的热工水力行为提供了基础数据，并对其进行了模拟，得到了以下结论：（5）对于水平流动，反环流的努塞尔数与雷诺数的0.35成正比，而对于垂直流动，努塞尔数与雷诺数无关。(6)水平流动的努塞尔数随壁面过热度和热平衡品质的增加呈指数下降。随着通流直径的增大，与过热有关的功率绝对值增大，而与热平衡品质有关的功率绝对值减小。(7)建立了汽膜厚度的基本数据库，这对模拟界面的质量、能量和动量传递是非常重要的。提出了厚度的经验关联式。(8)反环流与液相单相流的摩擦系数与汽膜厚度和流径之比无关，而与汽膜厚度有关。厚度小于0.4mm时，乘数小于1。少