Measurement of Binary Diffusion Coefficients for Neon–Argon Gas Mixtures Using a Loschmidt Cell Combined with Holographic Interferometry

Measurement of Binary Diffusion Coefficients for Neon–Argon Gas Mixtures Using a Loschmidt Cell Combined with Holographic Interferometry
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使用洛施密特池结合全息干涉测量测量氖氩气体混合物的二元扩散系数

DOI:
10.1007/s10765-012-1352-4
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发表时间:
2013
影响因子:
2.2
通讯作者:
A. P. Fröba
A. P. Fröba
中科院分区:
工程技术4区
文献类型:
--
作者:
T. Kugler;B. Jäger;M. H. Rausch;E. Bich;A. P. Fröba

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本文报道了双组分扩散系数的实验数据。在293.15 K和333.15 K之间的温度范围内进行测量,并为1巴和10巴之间的压力在几乎整个组合物范围内,使用Loschirm扩散池结合全息干涉。恒温罗氏电池分为两个半电池,可以通过滑板分离和连接。在测量之前,将两种不同的纯气体填充到两个半电池中。在开始扩散过程之后,使用两个全息干涉仪在两个半电池中检测偏摩尔密度的时间变化,或者更确切地说气体的折射率的时间变化。利用该装置,可以确定二元扩散系数的温度、压力和浓度依赖性。扩散测量的相对不确定度在0.4%和1.4%之间,取决于压力。实验数据进行了比较,从文献中的数据和新的理论数据的基础上结合气体的动力学理论的量子mechanicalab initocalculations。由于系统误差,在上半电池中确定的浓度依赖性显示出与理论值和大多数文献数据的偏差。然而,从下半电池的数据中获得的浓度、温度和压力依赖性与现有数据非常一致。的产品的二元气体的扩散系数和气体混合物的摩尔密度显示没有显着的压力依赖于所研究的氘-氩惰性气体系统。
The paper reports on experimental binary diffusion coefficient data of neon–argon gas mixtures. Measurements were performed in the temperature range between 293.15 K and 333.15 K and for pressures between 1 bar and 10 bar over almost the whole composition range using a Loschmidt diffusion cell combined with holographic interferometry. The thermostated Loschmidt cell is divided into two half-cells, which can be separated and connected by a sliding plate. Prior to the measurements, two different pure gases are filled into the two half-cells. After starting the diffusion process, the temporal change of the partial molar densities, or rather of the refractive index of the gases, is detected in both half-cells using two holographic interferometers. With this apparatus, the temperature, pressure, and concentration dependence of the binary diffusion coefficient can be determined. The relative uncertainty of a diffusion measurement is between 0.4 % and 1.4 % depending on the pressure. The experimental data are compared with data from the literature and with new theoretical data based on quantum-mechanicalab initiocalculations combined with the kinetic theory of gases. Due to a systematic error, the concentration dependence determined in the upper half-cell shows deviations from the theoretical values and from most of the literature data. The concentration, temperature, and pressure dependence obtained from the data from the lower half-cell, however, are in very good agreement with available data. The product of the binary gas diffusion coefficient and the molar density of the gas mixture shows no significant dependence on pressure for the studied neon–argon noble gas system.
氖惰性气体系统中的气体扩散
DOI: --
发表时间: 1969
期刊:
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期刊: Physica D: Nonlinear Phenomena
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