利用热重力技术测量压力下烃类二元混合物的热扩散系数。

Measurement of thermodiffusion coefficient of hydrocarbon binary mixtures under pressure with the thermogravitational technique.

作者信息

Urteaga P, Bou-Ali M M, Alonso de Mezquia D, Santamaría J, Santamaría C, Madariaga J A, Bataller H

机构信息

Mechanical and Manufacturing Department, Engineering Faculty, Mondragon Unibertsitatea, Loramendi 4 Apdo. 20500 Mondragon, Spain.

出版信息

Rev Sci Instrum. 2012 Jul;83(7):074903. doi: 10.1063/1.4737628.

DOI:10.1063/1.4737628

PMID:22852714

Abstract

It was designed and constructed a new thermogravitational column able to operate at high pressures (up to 50 MPa). This new thermogravitational column is of the cylindrical type with closed ends. It is made of stainless steel. The length of the column is 0.5 m and the gap between its two walls is variable. First, the column was validated at atmospheric pressure by means of measurements of the thermodiffusion coefficient of well-known binary mixtures. Then, this new thermogravitational column was used to measure the thermodiffusion coefficient of the binary mixtures 1,2,3,4-tetrahydronaphtalene/isobutylbenzene, 1,2,3,4-tetrahydronaphtalene/n-dodecane, and isobutylbenzene/n-dodecane at high pressures and within the pressure range between 0.1 and 20 MPa at a mean temperature of 25 °C. We have found a linear dependence between the thermodiffusion coefficient and the pressure.

摘要

设计并建造了一种能够在高压（高达50兆帕）下运行的新型热重力柱。这种新型热重力柱为圆柱形，两端封闭。它由不锈钢制成。柱长0.5米，两壁之间的间隙可变。首先，通过测量知名二元混合物的热扩散系数，在大气压下对该柱进行了验证。然后，使用这种新型热重力柱在25℃的平均温度下，在0.1至20兆帕的压力范围内，测量了二元混合物1,2,3,4 - 四氢萘/异丁基苯、1,2,3,4 - 四氢萘/正十二烷以及异丁基苯/正十二烷在高压下的热扩散系数。我们发现热扩散系数与压力之间存在线性关系。