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

本文主要研究微米级(从微米级到纳米级)孔洞表面的热质传递。研究从理论和实验两个方面进行。本研究包括三个部分：(1)阳极氧化膜形成模型的理论探讨；(2)阳极氧化过程中微孔生长的分子动力学模拟程序的开发；(3)传热学实验及测量方法的发展。将多孔氧化铝表面视为具有代表性的纳米孔洞表面，在模拟的基础上，开发了分子动力学数值程序。为了适应不同的金属表面，采用了约翰逊势函数。通过求解钠的热问题，验证了计算机程序的正确性。在水平流体层中进行了有内加热和无内加热的自然对流换热实验。换热表面微孔的存在不会影响换热和流动。针对沸腾实验这一相变系统，提出了新的传热实验测量方法。PIXE的元素分析和质子射线照相的流动显示适用于热传递现象。

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.