比密粘度和特性粘数的计算及改正

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。

CALCULATION AND CORRECTIONS OF KINEMATIC VISCOSITY AND INTRINSIC VISCOSITY

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 ...