扭摆法测定界面剪切粘度中的若干问题

SOME PROBLEMS IN THE MEASUREMENT OF INTERFACIAL SHEAR VISCOSITY BY OSCILLATION METHOD

本文从动态力学原理出发,给出扭摆法测定界面剪切粘度计算公式的推导,以证明某些文献中所引公式的可能错误。此外,推荐一种基液阻尼因子的计算方法和扭摆体系转动惯量和扭力常数的测定方法。

The viscous properties of fluid interfaces play an important role in the stability of foams and emulsions as well as in the selection of surfactants and polymers for enhanced oil recoveries (EOR). In this work, the equations for calculating interfacial shear viscosity using oscillating torsional method were derived in terms of the fundamental principles of mechanics and, by the way, a confusing error in some literature source was pointed out. In addition the calculating methods for the moment of inertia of irregular objects, the conatant of the torsion wire, and the damping factors of bulk liquids were proposed.