Development of New Purge Device Using Liquid Jet

利用液体射流开发新型吹扫装置

• 批准号: 07555066
• 负责人: ESAKI Shuji
• 金额: $ 1.28万
• 依托单位: Kagoshima National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555066/
• 关键词: Nozzle; Multi-phase Flow; Bubble; Gas Entrainment; jet

An experimental study was made to clarify the fundamental characteristics of the gas entrained by water jet which flows into liquid surface in a pipe. Experimental parameters considered were the velocity of water jet, the diameter of nozzle, the height of nozzle from the liquid surface in a test pipe and the diameter of test pipe. Experiments were carried out in air-water system under condition of atmospheric pressure. As the result, the gas entrainment increases with increasing both the velocity of water jet and the height of nozzle. However, the gas entrainment decreases when the location of nozzle from the liquid surface is too high. Bacause, the part of water jet becomes easy to touch the inner wall of test pipe and the flow rate of water which flows along the inner wall of test pipe increases. Also, the use of nozzle with many small holes rather than single large hole would be useful to increase the gas entrainment if the total flow rate of jet is same.

对水射流携带气体进入管内液面的基本特性进行了实验研究。实验参数包括水射流速度、喷嘴直径、喷嘴距试验管液面高度和试验管直径。实验在常压空气-水系统中进行。结果表明，随着水射流速度和喷嘴高度的增加，气体卷吸量增加。当喷嘴距离液面过高时，气体卷吸量减小。这是因为，水射流的一部分变得更容易接触到测试管的内壁，并且水沿着测试管的内壁沿着流动的流量增加。在总流量相同的情况下，采用多小孔喷嘴比采用大孔喷嘴更有利于提高气体卷吸量。