物理化学学报 >> 1997, Vol. 13 >> Issue (01): 89-95.doi: 10.3866/PKU.WHXB19970120

研究简报 上一篇    

高温高压下水与非极性流体间的界面张力

田宜灵,肖衍繁,朱红旭,董习靖,任晓文,张凤才   

  1. 天津大学化学系,天津 300072
  • 收稿日期:1996-01-15 修回日期:1996-10-24 发布日期:1997-01-15
  • 通讯作者: 田宜灵

Interfacial Tensions between Water and Non-polar Fluids at High Pressures and High Temperatures

Tian Yi-Ling,Xiao Yan-Fan,Zhu Hong-Xu,Dong Xi-Jing,Ren Xiao-Wen,Zhang Feng-Cai   

  1. Department of Chemistry,Tianjin University,Tianjin 300072
  • Received:1996-01-15 Revised:1996-10-24 Published:1997-01-15
  • Contact: Tian Yi-Ling

关键词: 高压, 高温, 界面张力, 甲烷, 正乙烷, 正庚烷, 氧, 氮;水

Abstract:

The pendent drop or standing bubble method is applied to measure the interfacial tensions between water and nonpolar fluids (n-hexane, n-heptane, nitrogen, oxygen and methane) up to 473K and 220MPa. The high pressure autoclave with t wo visual windows and the auxiliary equipment are described. The sizes(ca 2mm) and shapes of drops or bubbles are recorded with microscope and video camera. The use of digital image permits fast, precise determination of the contour parameters. The densit y values of the liquids or gases have been chosen from literature. A special program is proposed to calculate the interfacial tensions automatically from drop shape at given temperature and pressure. The interfacial tensions σ12 increase with pr essure for the two liquid-liquid systems, but decrease with pressure for the three gas-liquid systems.

Key words: High pressure, High temperature, Interfacial tension, Methane, Heptane, Hexane, Oxygen, Nitrogen, Water