Effective optimization of measurement accuracy of rotational viscometers based on the double cylindrical perturbation model.

Abstract

We introduce an optimized principle for measuring liquid viscosity based on the rotational method. This principle can be further utilized in an improved dynamic torque viscosity testing system to obtain a wide range of viscosities with high accuracy. Newton's law of viscosity serves as the foundation for the traditional rotational viscosity measurement principle, which measures a liquid's viscosity by measuring its resistance to a rotating cylinder. Throughout the studies, it was discovered that the liquid's viscous interaction with the vessel's top and bottom surfaces regularly produced extra torque that would have raised the measurement results. The instability and unpredictability of the measurement core device often affect the accuracy of the measurements. Hence, we improved the calculation method for traditional viscometer measurements and used a high-precision dynamic torque sensor to modify the fundamental measuring element. To ensure the precision and dependability of the results, the experimental apparatus was calibrated and tested using standard substances (H2O and NaCl). We found that the average error of the viscosity measurements was below 2.73% within the 0-60 rpm range, with a minimum detectable difference of 1 µPa·s. Furthermore, the experimental system further stores and analyzes the data using RS485 communication with a host computer.