Measurement of the diffusion coefficient of miscible fluids using both interferometry and Wiener's method

被引:37
作者
Rashidnia, N
Balasubramaniam, R
Kuang, J
Petitjeans, P
Maxworthy, T
机构
[1] NASA, Glenn Res Ctr, Natl Ctr Micrograv Res Fluids & Combust, Cleveland, OH 44135 USA
[2] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[3] ESPCI, PMMH, F-90075 Paris, France
关键词
diffusion coefficient; interferometry; miscible interfaces; Wiener's method;
D O I
10.1023/A:1010735117408
中图分类号
O414.1 [热力学];
学科分类号
摘要
Measurements of the diffusion coefficient of two miscible liquids are reported. The liquids at e various combinations of pure silicone oils and those to which small amounts of solvents are added to control the difference in density between the fluids. The liquids were placed in a quartz cell such that the interface is initially horizontal. As the fluids diffuse, the profile of the index of refraction near the interface is time dependent and is related to the local concentration of the diffusing fluids. The concentration gradient profile was measured by a shearing interferometer incorporating a Wollaston prism, as well as Wiener`s method. In the latter technique, a 45 degrees light sheet was passed through the test cell. and the local deflection of the light beam was measured. The average diffusion coefficient was obtained by analysis of the measured concentration gradient profile, assuming that the diffusion process is one-dimensional and is characterized by a constant value of the diffusion coefficient.
引用
收藏
页码:547 / 555
页数:9
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