物理化学学报 >> 1991, Vol. 7 >> Issue (05): 524-530.doi: 10.3866/PKU.WHXB19910503

研究论文 上一篇    下一篇

比密粘度和特性粘数的计算及改正

陈立班; 杨淑英   

  1. 中国科学院广州化学研究所,广州 510650
  • 收稿日期:1990-04-16 修回日期:1990-07-27 发布日期:1991-10-15
  • 通讯作者: 陈立班

Calculation and Corrections of Kinematic Viscosity and Intrinsic Viscosity

Chen Li-Ban; Yang Shu-Ying   

  1. Guangzhou Institute of Chemistry, Academia Sinica, Guangzhou 510650
  • Received:1990-04-16 Revised:1990-07-27 Published:1991-10-15
  • Contact: Chen Li-Ban

摘要: 本文导出毛细管粘度计的比密粘度方程:
v=η/ρ=At-Bt~(-1)+C
式中-Bt~(-1)和C分别代表动能改正和残液改正。方程在宽的粘度范围内有良好精度。
本文提出,准确的特性粘数[η]与忽略任何改正的特性粘数[η]~*之间存在简单的线性关系。例如从以上方程可写出
[η]=(1+k_e-k_v)[η]~*+δρ
式中k_e=2Bt_o~(-1)/At_0+Bt_0~(-1)+C), k_v=C/(At_0-Bt_0~(-1)+C), δρ=(ρ_1-ρ_0)/(c_1ρ_0), 它们分别是代表动能改正、残液改正和密度改正的常数。利用以上特性粘数改正公式, 可在确保准确性的前提下极大地简化特性粘数的改正计算。

关键词: 比密粘度, 特性粘数, 动能改正, 残液改正, 计算

Abstract: A kinematic viscosity equation is suggested for capillary viscometers. The equation shows good accuracy in a wide range of viscosity as well as the Reynolds number:
v=η/ρ=At-Bt~(-1)+C
where v is the kinematic viscosity, t is the efflux time, and A,B,C are instrumental constants. The terms of -Bt~(-1) and C are corres ρ onding to the kinetic energy correction and the drainage correction respectively.
In order to simplify the calculation, a linear [η]~[η]~* correlation has been found, where [η] and [η]~* denote the accurate and the approximate (based on ...

Key words: Kinematic viscosity, Intrinsic viscosity, Kinetic energy correction, Drainage correction, Calculation