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Research Initiation Awards: Study of Thermal Phenomena at Interfaces

研究启动奖：界面热现象研究

基本信息

批准号：
9010311
负责人：
Arunava Majumdar
金额：
$ 3.91万
依托单位：
Arizona State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1990
资助国家：
美国
起止时间：
1990-08-15 至 1992-09-15
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9010311&HistoricalAwards=false
关键词：
Research Initiation Awards Study Thermal

项目摘要

Roughness measurements of solid surfaces, such as thin films and machined metals, at microscales and nanoscales show that the surfaces are rough and disordered over several decades of length scales. Similar features have been observed in turbulent fluid interfaces. Such disordered structures strongly influence thermal phenomena at interfaces. Previous studies on thermal phenomena at such interfaces have conventionally made either oversimplifying idealizations of smoothness of an interface or resorted to empirical and semi- empirical methods of analysis. This lack of physical understanding of the phenomena was mainly due to an inability to quantify the disorder in these structures. This study proposes to use the novel concepts of fractal geometry to understand and characterize the fundamental nature of disordered surfaces. Such a characterization quantifies the structure of surfaces at every length scale within certain limits. This is particularly important in providing key insight into the interactions of thermal phenomena with interfaces at relevant length scales. Preliminary studies on applying fractals in contact conductance have explained several previous experimental results. Based on these encouraging prospects, this study proposes to use fractals to study interfacial thermal phenomena of scientific and engineering importance such as contact conductance, frictional heating, and interactions of radiation with surfaces.

薄膜等固体表面的粗糙度测量和机械加工金属的微观和纳米尺度研究表明，几十年来，长度刻度。类似的特征在湍流界面这种无序的结构强烈影响界面处热现象。先前对这种界面处的热现象的研究传统上要么过于简化理想化，光滑的界面或诉诸经验和半- 经验分析方法。这种身体上的缺乏对这种现象的理解主要是由于来量化这些结构中的无序。本研究建议使用分形几何的新概念，理解并描述无序的表面这种表征量化了在一定范围内的每个长度尺度上的表面结构限制. 这一点在提供关键深入了解热现象与在相关长度尺度上的界面。的初步研究在接触电导中应用分形解释了之前的一些实验结果。基于这些令人鼓舞的前景，这项研究建议使用分形，研究科学和工程中界面热现象，工程重要性，如接触电导，摩擦加热和辐射与表面的相互作用。