Optimum mixture compositions for measurement of cross virial coefficients
Optimum mixture compositions for measurement of cross virial coefficients
复制标题
用于测量交叉维里系数的最佳混合物成分
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
K. Hall
中科院分区：
文献类型：
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作者：
P. T. Eubank;K. Hall
随机误差传播的检查，以确定跨第二和第三维里系数从二元气体密度测量的间接和直接的方法。当ye 1 = ye 2时，通过间接法由单一组分的Bm确定交叉第二维里系数B12是最佳的，其中e1和e2是纯组分的不确定度。当所有误差相等时，等摩尔混合物是预期的最佳混合物。
对交叉第三维里系数C112和C122的相应分析表明，最佳组成不是（frac 13;，frac 23;），而是（frac 14;，frac 34;）。提出的方程允许确定的两个最佳组合物，当电磁随组合物而变化。当所有误差相等时，通过在两种组成下的混合物测量使B12、C112和C122中的组合误差最小化提供了接近（frac 13;，frac 23;）的结果。对直接测量B12的方法进行了重新审查。使用第三维里系数相关性找到最佳组合物。
Random error propagation is examined to determine cross second and third virial coefficients from binary gas density measurements by both the indirect and direct methods. Determination of the cross second virial coefficient B12 from Bm at a single composition via the indirect method is optimized when ye1 = ye2, where e1 and e2 are the pure component uncertainties. When all errors are equal, the equimolar mixture is optimum as expected.
Corresponding analysis of the cross third virial coefficients, C112 and C122, show that the optimum compositions are not (frac13;, frac23;) as expected for equal error distribution, but rather (frac14;, frac34;). Equations presented allow determination of the two optimum compositions, when em varies with composition. Minimization of the combined errors in B12, C112, and C122 via mixture measurements at two compositions provides results near (frac13;, frac23;), when all errors are equal. Methods for direct measurement of B12 are reexamined. Optimal compositions are found using third virial coefficient correlations.