Experimental Studies of Convective Turbulence

对流湍流的实验研究

• 批准号: 9623612
• 负责人: Penger Tong
• 金额: $ 24万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623612&HistoricalAwards=false
• 关键词: Experimental; Studies; Convective; Turbulence

9623612 Tong The research project will utilize light scattering and laser Doppler velocimetry techniques to study statistical properties of, and correlations among the velocity, temperature, and vorticity fields of turbulent thermal convection in water. The experiments will investigate (1) the spatial structure of the coherent motions and the correlations between the velocity and temperature fluctuations in turbulent convection, and (2) new scaling laws of velocity and vorticity statistics over varying Rayleigh numbers and length scales in the turbulent core region and near the boundary layers. The project will provide a body of reliable data to test current theories for turbulent convection and to understand key features in the turbulent heat transport and in the atmospheric convection. %%% The research project will utilize light scattering and laser Doppler velocimetry techniques (similar to automobile laser radar) to study statistical properties of turbulent motion in thermal convection. The proposed experiments are of fundamental interest for understanding the nature of convective turbulence, and they are also relevant to many practical applications in engineering, geography, and meteorology. The project will provide a body of reliable data to understand key features in the turbulent heat transport and in the atmospheric convection. Understanding the heat transport phenomena under different boundary conditions will shed new light on technological improvements for more efficient heat transfer in various industrial applications ranging from heat exchangers in a nuclear reactor to a reentry vehicle. The development of novel laser light scattering techniques will have additional applications in the discipline of fluid mechanics. ***

小行星9623612 该研究项目将利用光散射和激光多普勒 测速 技术来 研究 统计特性 ，以及它们之间的相互关系。 的 水的湍流热对流的速度场、温度场和涡度场。 实验将研究（1）相干运动的空间结构和相关性 之间 的 速度 和 湍流对流中的温度波动;（2）湍流核心区和边界层附近不同瑞利数和长度尺度上速度和涡度统计的新标度律。 该项目将提供一系列可靠的数据，以检验当前的湍流对流理论，并了解湍流热传输和大气对流的关键特征。 %该研究项目将利用光散射和激光多普勒测速技术（类似于汽车激光雷达） 研究热对流中湍流运动的统计特性。 所提出的实验对于理解 性质 对流湍流，它们也与许多实际的 在工程、地理、 和气象学。 该项目将提供一系列可靠的数据，以了解湍流热传输和大气对流的关键特征。 了解 在不同边界条件下的热传输现象将为从核反应堆中的热交换器到再入飞行器的各种工业应用中更有效的热传输的技术改进提供新的启示。 新型激光散射技术的发展将在流体力学学科中有更多的应用。 ***