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Wettability of Solid-Liquid Interface under Microgravity (Dynamic Behavior of Interface in Space)

微重力下固液界面的润湿性（空间界面的动态行为）

基本信息

批准号：
01550506
负责人：
FUKAZAWA Yasushi
金额：
$ 1.47万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

In the fabrication of metal-ceramic joint and composite materials, the wettability behavior must be considered to solve the interface phemomena. Especially, the further studies about the gravity is required to carry out the material experiments in space. Recently, many experimental procedures and analysis have been proposed and tried about the wettability, but a large part of methods have been operated only about the static condition without the bravityeffects. As these tests were made without some expeimetal conditions (dynamic condition, hysteresis, gravity ect.), the results had much difference and a few reproducibility among each tests. In order to observe the wettability in ground and space with considering the some experimental conditions, we proposed some new experimental methods and made the apparatus.In this paper, I carried out the Growing Drop Method and Liquid Bridge Methods in space using an aircraftflyingparabollic ballictic trajectories and added Meniscogrph Method, Incl … More ined Plate and Parallel Plate methods on ground. The results were compared each other and it investigated that the effects of gravity on the wettability.The following conclusions were obtained :(1) Growing Drop Method. Contact angle was depended on the drop size at static condition. Advancing and receding contact angle was affected on growing speed. Wetting behaviors varied with a gravity level.(2) Liquid Bridge Method. Liquid bridge shapes varied with the bridge aspect ratio and wettability onsolid-liquid interface. Contact angle at stable condition depended on the gravity level.(3) Meniscograph Method. Dynamic wetting behaviors were analyzed with a thoritical fluid mechanic equations and depended on the immersion speed, viscosity and the hysteresis. Oxidation had an effect considerably on the wetting phenomena using the melting metal.(4) Inclined Plate and Parallel Plate Method. The static contact angle can be evaluated from tase methods but there were some difference with another research results.(5) Comparing the results of each methods. On the ground, the static contact angle values were almost same between growing drop method and Meniscograph method and the liquid bridge's result agree with the reducing contact angle for other method. Under microgravity, the static contact angle values became larger than another reducing contact angle values at the liquid bridge method. Less

在金属-陶瓷连接及复合材料的制备中，必须考虑润湿行为，以解决界面现象。特别是开展空间物质实验，需要对重力场进行进一步的研究。近年来，人们提出了许多关于润湿性的实验方法和分析，但大多数方法都是在静态条件下进行的，没有考虑到表面的粗糙效应。由于这些测试是在没有某些实验条件（动态条件、滞后、重力等）的情况下进行的，各试验间结果差异较大，重复性差。为了在地面和空间观察润湿性，结合实验条件，提出了一些新的实验方法，并制作了实验装置。本文利用飞行器抛物线弹道飞行，在空间进行了生长液滴法和液桥法，并增加了弯月面法，包括弯月面法和液桥法。实验结果表明，该方法能有效地观察到润湿性，并能在一定程度上提高润湿性。 ...更多信息在地面上的倾斜板和平行板方法。比较了两种方法的结果，并考察了重力对润湿性的影响，得出以下结论：（1）生长液滴法。静态条件下，接触角与液滴尺寸有关.前进和后退接触角影响生长速度。润湿行为随重力水平而变化。(2)液桥法液桥形状随桥长径比和固液界面润湿性的变化而变化。在稳定条件下的接触角取决于重力水平。(3)半月板法用理论流体力学方程分析了动态润湿行为，并与浸泡速度、粘度和滞后有关。氧化对使用熔融金属的润湿现象有相当大的影响。(4)斜板法和平行板法。静态接触角可以用tase法测定，但与其他研究结果有一定差异。(5)比较各种方法的结果。在地面上，生长液滴法和弯月面法测得的静态接触角基本一致，液桥法测得的静态接触角与其他方法测得的静态接触角基本一致。在微重力条件下，液桥法测得的静态接触角大于液桥法测得的还原接触角。少