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Dynamic viscoelasticity measurement under alternative torque using electromagnetically spinning method with quadruple

Yusuke Matsuura1, Taichi Hirano1, Keiji Sakai1

  • 1Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan.

The Review of Scientific Instruments
|August 3, 2017
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Summary

A new rheological measurement system uses quadruple electromagnets for noncontact probe rotation. This enhanced electromagnetically spinning (EMS) viscometer measures both shear viscosity and viscoelasticity frequency spectra.

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Area of Science:

  • Rheology and Materials Science
  • Electromagnetism and Instrumentation

Background:

  • The electromagnetically spinning (EMS) viscometer is a widely adopted tool for rheological flow curve measurements across industries.
  • Existing EMS systems primarily focus on shear viscosity, limiting comprehensive viscoelastic characterization.

Purpose of the Study:

  • To develop an advanced rheological measurement system with enhanced capabilities.
  • To enable noncontact, periodic rotational driving of a spherical probe using quadruple electromagnets.
  • To expand the functionality of the EMS viscometer for detailed viscoelastic property analysis.

Main Methods:

  • Development of a novel rheological measurement system employing quadruple electromagnets.
  • Noncontact, periodic rotational actuation of a spherical probe via applied torques.
  • Integration of variable torque operation modes to switch between viscosity and viscoelasticity measurements.

Main Results:

  • The quadruple EMS system successfully measures shear viscosity in steady flow.
  • The system provides the frequency spectrum of viscoelasticity by altering torque operation modes.
  • Experimental validation was performed using Newtonian fluids and viscoelastic materials, confirming system accuracy.

Conclusions:

  • The novel quadruple EMS system offers a significant advancement in rheological measurement.
  • This enhanced system provides a broader range of rheological data, including viscoelastic properties.
  • The demonstrated validity supports its potential application in diverse industrial and research settings.