Presidential Young Investigators Award: Exploratory Studiesin Heat and Mass Transfer

总统青年研究员奖：传热传质探索性研究

• 批准号: 8858288
• 负责人: John Lienhard
• 金额: $ 31.2万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-15 至 1994-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8858288&HistoricalAwards=false
• 关键词: Presidential; Young; Investigators; Award; Exploratory

This research addresses a number of topics in the general area of heat and mass transfer. One effort considers the high heat fluxes and enhancement techniques to increase the maximum measured heat transfer. This problem will be pursued in relation to the boiling of impinging liquid jets, with the general intention of generating the greatest heat transfer rates possible. A key objective is to determine what, if any, maximum exists for the energy transfer by phase change. Another area for this year's work is an analysis of the effects of thermal radiation on multilayer Rayleigh-Benard instability. A continuing study concerns the effects of strongly stabilizing stratification on heat transfer in turbulent flow. Large density gradients suppress turbulent heat convection, in a process antithetical to natural convection. Studies of the coagulation of aerosols in turbulent flows will also be initiated, with the objective of obtaining reliable data on coagulation rates under given turbulent conditions. The high flux studies will influence the handling of heat at high power densities. If successful, they will provide the means of cooling such high flux systems as fusion reactors and high power laser mirrors. The stability studies are directly relevant to flat-plate solar collectors and will enable more efficient designs to be implemented. The stratified turbulence studies are of fundamental importance to the understanding of transport processes in the atmosphere and oceans, as well as to a number of engineering situations. Control of the stratification in a fluid (viz., the density gradient) enables control of heat losses. The aerosol studies address a fundamental issue in particle transport and have many potential applications to engineering.

这项研究解决了一些主题的一般领域的热量 和质量传递。 一种努力考虑了高的热通量， 增强技术，以增加最大测量的热传递。 这一问题将在有关沸腾的碰撞 液体射流，一般的目的是产生最大的 热传递速率可能。 一个关键目标是确定什么， 如果存在，则对于通过相变的能量传递存在最大值。 今年工作的另一个领域是分析 热辐射对多层Rayleigh-Benard不稳定性的影响 一 持续的研究关注强烈稳定的影响， 湍流传热分层 大密度 梯度抑制湍流热对流，在一个过程中， 与自然对流相反。 混凝作用的研究 湍流中的气溶胶也将启动，目标是 在给定的湍流条件下， 条件 高通量研究将影响高温下的热处理。 功率密度 如果成功，他们将提供 聚变反应堆和高功率激光器等高通量系统的冷却 镜子. 稳定性研究与平板直接相关 太阳能集热器，并将使更有效的设计， 切实贯彻 分层湍流的研究具有重要的理论意义和实用价值 对了解大气中的输运过程的重要性 大气和海洋，以及一些工程 situations. 控制流体中的分层（即，的 密度梯度）能够控制热损失。 气溶胶研究 解决了粒子传输中的一个基本问题， 潜在的工程应用。