Comments on ER (electrorheological) fluid rheology
The label electrorheological (ER) fluid reflects the salient feature of these materials that continues to attract the attention of scientists and technologists alike. This is the ability to induce significant changes in rheology through an applied electric field. This electrically induced transformation of a fluid-like suspension of nonconducting particles and liquid, to a solid-like gel with a yield stress and corresponding high viscosity, is as useful as it is striking. The ability to characterize and understand this so-called Winslow effect is fundamental to successful applications. The current interest in ER fluid development provides strong motivation to rheologists. Our purpose here is to discuss briefly some principles of rheology that apply to ER fluids; they range from well-established and familiar to somewhat subtle. We will focus on the measurement of viscosity and yield stress. 8 refs., 2 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5439573
- Report Number(s):
- SAND-89-2604C; CONF-8908183--1; ON: DE90002892
- Country of Publication:
- United States
- Language:
- English
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