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。
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 η_r~*=t/t_0) values of the intrinsic viscosity respectively. [η]= (1+k_e-k_v)[η]~*+δ_ρ where k_e= 2Bt_0^(-1)/(At_0-Bt_0^(-1)+C),k_v= C/(At_0-Bt_0^(-1)+C),and δ_ρ=(ρ_1-ρ_0)/(c_1ρ_0), They are constants for the kinetic energy correction, the draiaage correction, and the density correction respectively, t_0,ρ_0 are the efflux time and the density of the pure solvent; c_1,ρ_1 are the concentration and the density of the primary solution.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第5期524-530,共7页
Acta Physico-Chimica Sinica
关键词
比密粘度
特性粘数
计算
改正
动能
Kinematic viscosity, Intrinsic viscosity, Kinetic energy correction, Drainage correction, Calculation
