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Investigation of interfacial area concentration transport of bubbly flows in small diameter pipe at normal and micro-gravity environment

常重力和微重力环境下小直径管道内气泡流界面区域浓度传递研究

基本信息

批准号：
14580542
负责人：
HIBIKI Takashi
金额：
$ 2.3万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The two-fluid model is considered most accurate and rigorous model as a two-phase flow analysis utilized in various engineering fields such as mechanical, nuclear and chemical engineering. The two-fluid model consists of six equations of mass, momentum and energy equations for each phase. In order to make the two-fluid model useful, the interfacial transfer term given by the product of the interfacial area concentration and the driving force should be given accurately.This study focuses on the development of the interfacial area transport equation of bubbly flows in a small diameter pipe at normal and microgravity conditions, and the construction of the database.The following researches have been made at relatively low Reynolds number where the effect of the gravity on the flow parameters would be enhanced.1. Construction of the database at normal gravity condition2. Modeling of source and sink terms of the interfacial are a concentration3. Evaluation of the interfacial area transport equationBased on the above results, the following conclusions are obtained as1. The dominant interfacial area transport mechanism at low Reynolds number under normal gravity environment is wake entrainment.2. The dominant interfacial area transport mechanism at low Reynolds number under micro gravity environment is pseudo-wake entrainment.3. The relative velocity between phases is not zero even at micro gravity conditionsThis research is expected to contribute the design criteria of two-phase flow machines at micro gravity conditions.

双流体模型被认为是最精确和严格的模型，作为两相流分析中使用的各种工程领域，如机械，核和化学工程。双流体模型包括六个方程的质量，动量和能量方程的每一个阶段。为了使双流体模型具有实用性，需要准确地给出由界面浓度和驱动力的乘积给出的界面传递项.本文着重建立了正常和微重力条件下小直径管道中泡状流的界面传递方程，在雷诺数较低的情况下，重力对流动参数的影响会增强，本文主要进行了以下研究.正常重力条件下数据库的构建2.模拟的源和汇项的界面是一个浓度3。界面面积输运方程的评价基于以上结果，得到以下结论：1.在正常重力环境下，低雷诺数下界面面积输运的主要机制是尾流湍流.微重力环境下低雷诺数下的界面输运机制主要是伪尾迹湍流.微重力条件下两相流的相对速度不为零，本文的研究为微重力条件下两相流机械的设计提供了依据。