Gebhardt M, Köhler W
Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany.
Eur Phys J E Soft Matter. 2015 Apr;38(4):24. doi: 10.1140/epje/i2015-15024-5. Epub 2015 Apr 24.
Within the framework of an international benchmark test we have performed measurements of the Soret and thermodiffusion coefficients of the organic ternary mixture (0.8/0.1/0.1 mass fraction) of 1,2,3,4-tetrahydronaphthaline (THN), isobutylbenzene (IBB) and n -dodecane (n C12) at 298.15K by means of a two-color optical beam deflection technique (OBD). The data evaluation procedure is based on a least squares fitting routine for an approximate analytical solution for the Soret cell problem. The condition number of the contrast factor matrix and standard error propagation are used for an error estimation for the measured Soret and thermodiffusion coefficients. The Soret coefficients obtained are S (') T(THN) = (1.20±0.09)×10(-3) K^-1, S (') T(IBB) = (- 0.34±0.14)×10(-3) K^-1, and S (') T(nC12) = (- 0.86±0.06)×10(-3) K^-1 and the corresponding thermodiffusion coefficients are D (') T(THN) = (0.72±0.26)×10(-12) m^2(s K)^-1, D (') T(IBB) = (- 0.22±0.42)×10(-12) m^2(s K)^-1, and D (') T(nC12) = (- 0.50±0.16)×10(-12) m^2(s K)^-1. These results will be used as ground-based reference data for the DCMIX project, where thermodiffusion experiments of ternary mixtures are measured in a microgravity environment aboard the International Space Station (ISS).
在国际基准测试框架内，我们利用双色光束偏转技术（OBD），在298.15K温度下对1,2,3,4 - 四氢萘（THN）、异丁基苯（IBB）和正十二烷（nC12）的有机三元混合物（质量分数为0.8/0.1/0.1）的索雷特系数和热扩散系数进行了测量。数据评估程序基于索雷特池问题近似解析解的最小二乘拟合例程。对比度因子矩阵的条件数和标准误差传播用于测量的索雷特系数和热扩散系数的误差估计。得到的索雷特系数为S(')T(THN) = (1.20±0.09)×10(-3) K^-1，S(')T(IBB) = (- 0.34±0.14)×10(-3) K^-1，S(')T(nC12) = (- 0.86±0.06)×10(-3) K^-1，相应的热扩散系数为D(')T(THN) = (0.72±0.26)×10(-12) m^2(s K)^-1，D(')T(IBB) = (- 0.22±0.42)×10(-12) m^2(s K)^-1，D(')T(nC12) = (- 0.50±0.16)×10(-12) m^2(s K)^-1。这些结果将用作DCMIX项目的地面参考数据，该项目中三元混合物的热扩散实验在国际空间站（ISS）的微重力环境中进行测量。
