2018 Volume 46 Issue 5 Pages 203-206
Viscosity is a fundamental parameter in fluid dynamics and the only physical property for determining the relationship between stress and strain, in other words, force and deformation. In addition, it may be a measure of strength of molecular motions and their interactions. As for the commercially available viscometers or rheometers, they still have problems about usable range of the minimum torque, condition control of measurement environment, time-consuming work of exchanging sample, and so on. Furthermore, it remains difficulty to clear which mode of molecular motion represents the measured data. Considering the slow progress of technique for solving these problems, I have developed many innovative systems to accurately measure and/or directly observe the rheological properties. In this paper, I introduce the newly developed systems, and show the remarkable results.