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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.

本研究采用空气-水、液氮和硅油3种工质进行由旋转内筒和静止外筒组成的旋转环形通道的实验研究。空气-水和液氮实验装置结构相似，测量了流动和传热特性。在气水两相流实验结果的基础上，对压降、流态转变、空隙率和气泡特性进行了讨论，确定了基本的流动特性。在静止条件下，可以对圆管获得的三岛-石井流态图进行调整，并且随着转速的增加，流态转变条件移动到较低体积流速条件。在研究中，通过对使用流图像处理获得的气泡特性的讨论来解释这种流态转变，并且还采用了漂移通量模型。在液氮实验的情况下，通过电加热器加热外筒，确认了传热特性和干燥特性。以前的研究是在强制对流下进行的，但硅油的研究是在强制对流下进行的。泳池状况。在这种情况下，内筒不是圆柱形而是圆锥形，并且该圆锥形内筒被冷却。实验中，利用热敏液晶和PIV将流动特性和温度分布可视化，并将流动转变解释为混合对流现象，即内筒冷却产生的自然对流与内筒旋转产生的强制对流之间的相互作用。