Turbulent Kinetic Energy Dissipation in Buoyant Motions

浮力运动中的湍流动能耗散

• 批准号: 8412641
• 负责人: E. John List
• 金额: $ 38万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1984
• 资助国家: 美国
• 起止时间: 1984-11-15 至 1988-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8412641&HistoricalAwards=false
• 关键词: Turbulent; Kinetic; Energy; Dissipation; Buoyant

This research project examines the influence of buoyancy forces on the rate of turbulent kinetic energy dissipation. Two problems in which buoyancy forces play a significant role in determining the motion are investigated: turbulent plume generated by a source of buoyant fluid and vertical mixing across adensity- interface within a fluid. The experiments are performed using alaser-Doppler anemometer for velocity measurement and laser induced fluorescence in dye molecules for tracer concentration. The research results will be of practical importance to environmental engineers concerned with particle coagulation mechanics, and the mixing of dissolved materials withindensity-stratified fluids. Applications include the optimal design of waste water treatment and disposal systems, description of processes such as aeration of water bodies, dissolution of atmospheric gases such as carbon dioxide, and flocculation of suspended particles in river estuaries.

该研究项目研究浮力对湍流动能耗散率的影响。 研究了浮力在确定运动中起重要作用的两个问题：由浮力流体源产生的湍流羽流和穿过流体内密度界面的垂直混合。 实验使用激光多普勒风速计进行速度测量，并使用染料分子中的激光诱导荧光测量示踪剂浓度。 研究结果对于关注颗粒凝结力学以及密度分层流体中溶解材料的混合的环境工程师具有实际意义。 应用包括废水处理和处置系统的优化设计、水体曝气、二氧化碳等大气气体的溶解以及河口悬浮颗粒的絮凝等过程的描述。