Molecular-level Control of Heat and mass transfer using by surface with nano-size holes

利用纳米孔表面进行传热传质的分子级控制

基本信息

  • 批准号:
    10650211
  • 负责人:
  • 金额:
    $ 2.3万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1998
  • 资助国家:
    日本
  • 起止时间:
    1998 至 1999
  • 项目状态:
    已结题

项目摘要

This study have focused on heat and mass transport on the surface with micro-scale (from micro meter to nano meter) holes. Study is conducted theoretically and experimentally. Results of this study contained three parts ; (1) theoretical discussion on the model of development of anodizing film, (2) development of simulation code of molecular dynamics for micro-hole growth at anodizing, (3) heat transfer experiments and development of measurement methods for it.On the theoretical discussion, reexamination of existing models was conducted. Porous Alumina surface is treated as representative nano-hole surface.On simulation, numerical code of molecular dynamics is developed. Johnson potential function is used in order to adapt to various metallic surface. Computer code are examined by solving on the thermal problem of Sodium.Heat Transfer experiments are conducted on natural convection in a horizontal fluid layer with and without internal heating. Existing of micro-scale hole on the heat transfer surface is not affected on heat transfer, and flow motion. For boiling experiment as the phase-change system, new measurement methods for heat transport experiments were developed. Element analysis by PIXE and flow visualization by proton radiography were adapted to the heat transport phenomena.
本论文主要研究微尺度(从微米到纳米)孔洞表面的热质传输。从理论和实验两方面进行了研究。本研究的结果包含三个部分:(1)阳极氧化膜发展模型的理论探讨;(2)阳极氧化微孔成长的分子动力学模拟程式的发展;(3)热传递实验与热传递量测方法的发展。将多孔氧化铝表面作为典型的纳米孔表面,在模拟方面,编制了分子动力学数值模拟程序。采用约翰逊势函数,以适应各种金属表面。通过求解钠的热力学问题验证了程序的正确性,并进行了水平流体层内有、无内加热时的自然对流换热实验。传热表面上微小孔的存在对传热和流动没有影响。针对沸腾实验这一相变系统,发展了新的传热实验测量方法。通过PIXE元素分析和质子照相流动显示的热传输现象进行了调整。

项目成果

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