Two-phase Flow Characteristics under Taylor-Spiral Flow Condition

泰勒螺旋流条件下的两相流特性

基本信息

批准号：
16560197
负责人：
OZAWA Mamoru
金额：
$ 2.43万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560197/
关键词：
Taylor vortex rotational annulas Flow Characteristics Flow pattern

项目摘要

In this investigation, experimental studies with rotational annular channel, which consisted of rotational inner cylinder and stationary outer cylinder, were conducted by using three kinds of working fluids, i.e.air-water, liquid nitrogen and silicon oil.The experimental apparatuses for the investigations of air-water and liquid nitrogen were similar configuration, and flow and heat transfer characteristics were measured. On the basis on the experimental results of the air-water two-phase flow, pressure drop, flow regime transition, void fraction and bubble characteristics were discussed, and fundamental flow characteristics have been confirmed. In the case of the stationary condition, Misihima-Ishii's flow regime map, which is obtained for the round pipe, could be adapted, and flow regime transition conditions moved to the lower volumetric flow velocity condition with the increasing of the rotational speed. In the investigation, this flow regime transition was explained by the discussion of the bubble characteristics, which was obtained by using the flow image processing, and also drift-flux model had been adapted.In the case of the experiment of the liquid nitrogen, outer cylinder was heated by electric heater, and heat transfer characteristics and dryout characteristics had been confirmed.Former investigations were conducted under forced convection, but the investigation of the silicon oil was conducted under pool condition. In this case inner cylinder is not column but conical, and this conical inner cylinder was cooled. In the experiment, the flow characteristics and temperature distribution was visualized by using the thermo-sensitive liquid crystal and PIV, and flow transition was explained as the phenomena of the mixed convection, i.e. the interaction between the natural convection by the cooling of the inner cylinder and the forced convection caused by the rotation of the inner cylinder.

在这项研究中，通过使用三种工作流体，即（即空气 - 水，液氮和硅油）进行的旋转环形通道的实验研究是由旋转内圆柱和固定的外缸组成的。用于空气水和液态液体氮气的调查是类似的配置和流量转移的特征。根据空气水流两相流，压降，流动状态过渡，空隙分数和气泡特性的实验结果，并已确认基本流动特性。在固定条件的情况下，可以调整用于圆管的Misihima-Ishii流动状态图，并随着旋转速度的增加而移至较低的体积流量速度条件。在调查中，通过对气泡特性的讨论来解释这种流动状态，该讨论是通过使用流程图像处理而获得的，并且也已经适应了漂移通量模型。在实验的情况下，液氮的实验，外部气缸是通过电加热器加热的，由电加热器加热，并确认了井中的调查。游泳池状况。在这种情况下，内圆柱不是圆柱，而是圆锥形的，并且该圆锥形内缸被冷却。在实验中，使用热敏感的液体晶体和PIV可视化流动特性和温度分布，并将流过渡解释为混合对流的现象，即通过冷却内圆柱体的自然对流与内部圆柱体旋转引起的强制对流之间的相互作用。