Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||H J. Walls; Robert F. Berg; Eric J. Amis;|
|Title:||Multi-Sample Couette Viscometer for Polymer Formulations|
|Published:||January 01, 2005|
|Abstract:||We describe a prototype scalable viscometer aimed at facilitating rapid measurements of multiple samples. The device simultaneously measures the viscosity of four samples in an array of Couette cells. Each cell contains a rotor with an embedded permanent magnet that is driven by an oscillating magnetic field generated by a 2-axis Helmholtz coil. The angular displacement of the rotors is recorded by a CCD camera. Image analysis determines the amplitude and phase of the rotors with respect to the coil s sinusoidal current. The viscosity of each sample influences the amplitude and phase of the rotor, which can be predicted with a viscously damped oscillator model. We present data for Newtonian fluids with viscosities from 50 to 2,000 mPa s. The results suggest that our approach can be extended to non- Newtonian fluids.|
|Citation:||Measurement Science & Technology|
|Keywords:||combinatorial methods,combinatorial viscometer,Couette cell,high throughput materials testing,magnetic rheometer,rheology|
|PDF version:||Click here to retrieve PDF version of paper (611KB)|