Stepping motor driven constant-shear-rate rotating viscometer
MetadataShow full item record
Despite the frequent use of stepping motors in robotics, automation and in a variety of precision instruments, they can hardly be found in rotational viscometers. This paper proposes the use of a stepping motor to drive conventional constant-shear-rate laboratory rotational viscometer, in order to avoid the use of velocity sensor and gearbox and, thus, simplify the instrument design. To investigate this driving technique, a commercial rotating viscometer has been adapted to be driven by a stepping motor, which is controlled via PC. Special circuitry has been added in order to microstep the stepping motor at a selectable step size, and to condition the torque signal. Tests have been carried out using the prototype to produce three flow curves for a standard Newtonian fluid (920 mPa.s at 25°C) but employing a different microstep size for each of them, within the shear rate range from 50 s-1 to 500 s-1. The results indicate the feasibility of the proposed driving technique.
How to cite this document
Showing items related by title, author, creator and subject.
P3L-3 Viscosity measurement of Newtonian liquids using the complex reflection coefficient Franco, Ediguer E.; Adamowski, Julio C.; Higuti, Ricardo T. ; Buiochi, Flávio (Proceedings - IEEE Ultrasonics Symposium, 2006) [Trabalho apresentado em evento]This work presents the implementation of the ultrasonic shear reflectance method for viscosity measurement of Newtonian liquids using wave mode conversion from longitudinal to shear waves and vice-versa. The method is based ...
Stepping-motor-driven constant-shear-rate rotating viscometer de Lucena, Samuel E. ; Kaiser, Walter (IEEE Transactions on Instrumentation and Measurement, 2008) [Artigo]Despite the frequent use of stepping motors in robotics, automation, and a variety of precision instruments, they can hardly be found in rotational viscometers. This paper proposes the use of a stepping motor to drive a ...
A Simple maxwell Based Model in Order to Represent the frequency-dependent viscosity measured by ultrasound Franco, Ediguer E.; Adamowski, Julio C.; Higuti, Ricardo T.; Buiochi, Flávio (Proceedings - IEEE Ultrasonics Symposium, 2008) [Trabalho apresentado em evento]A previous work showed that viscosity values measured high frequency by ultrasound agreed with the values at low frequency by the rotational viscometer when conditions are met, such as relatively low frequency viscosity. ...