THERMOGRAVITATIONAL SEPARATION AND THE THERMAL-DIFFUSION FACTOR NEAR CRITICAL-POINTS IN BINARY-LIQUID MIXTURES

被引：11

作者：

ECENARRO, O ^{[1
]}

MADARIAGA, JA ^{[1
]}

NAVARRO, JL ^{[1
]}

SANTAMARIA, CM ^{[1
]}

CARRION, JA ^{[1
]}

SAVIRON, JM ^{[1
]}

机构：

[1] UNIV ZARAGOZA, FAC CIENCIAS, ZARAGOZA, SPAIN

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1993年 / 5卷 / 15期

关键词：

D O I：

10.1088/0953-8984/5/15/002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The thermogravitational separation for each of the binary liquid systems nitrobenzene + n-hexane and isobutyric acid + water, as a function of composition, was measured at temperatures above and near to their critical conditions. The first system, in which the component densities are very different, presents large separations near the critical composition. In contrast, in the second one, with similar densities of the pure components, no separation is observed. The extension to high Soret numbers of our previously developed thermogravitational theory, which takes into account the effect of the bouyancy-driven convection induced by the density composition dependence allows us to obtain values of thermal diffusion factors of binary liquid mixtures in the vicinity of consolute points from separation measurements.

引用

页码：2289 / 2294

页数：6

共 15 条

[1]

ALMENARA E, 1977, 7 P S THERM PROP, P744

[2]

BONNER FJ, 1984, Z NATURFORSCH C, V39, P656

[3] CRITICAL PHENOMENA IN A BINARY MIXTURE OF N-HEXANE AND NITROBENZENE - ANALYSIS OF VISCOSITY AND LIGHT-SCATTERING DATA [J].