Comparative analysis of Bingham characteristics of ER/MR fluids with different viscometers

Young-Tai Choi; Norman M. Wereley

doi:10.1117/12.472651

27 June 2002 Comparative analysis of Bingham characteristics of ER/MR fluids with different viscometers

Young-Tai Choi, Norman M. Wereley

Proceedings Volume 4697, Smart Structures and Materials 2002: Damping and Isolation; (2002) https://doi.org/10.1117/12.472651
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

This paper theoretically presents Bingham characteristics of ER (electrorheological)/MR (magnetorheological) fluids with respect to different rotational viscometers through comparative analysis. For doing so, two different types of rotational viscometers are introduced and configured for ER/MR fluids; one is a rotational coaxial cylinder viscometer and the other is a rotational parallel disk viscometer. In order to determine the shear stress and shear rate of fluids tested in both viscometers, the fundamental equations between shear stress and torque as well as shear rate and angular velocity are derived on the basis of the biviscous constitutive model. The biviscous model is characterized by a yield stress: when the shear stress is less than this yield stress, the preyield viscosity is relatively large compared to the postyield viscosity when shear stress is greater than the yield stress. For rotational coaxial cylinder viscometers, the shear stress can be calculated directly from the measured torque. However, for the determination of the shear rate, some strategies are required. In this study, different methods of determining the shear rate are developed and their accuracy is assessed. In the case of rotational parallel disk viscometers, the calculation of the shear rate is straightforward from angular velocity measurements, but the shear stress requires a relatively complicated calculation. In this study, for simplicity, the shear stress is approximated and the error of this approximation is evaluated with respect to important rotational parallel disk viscometer geometry. Finally, the Bingham characteristics of ER/MR fluids at two different rotational viscometers are theoretically presented and compared in the shear stress vs. shear rate response.

Citation Download Citation

Young-Tai Choi and Norman M. Wereley "Comparative analysis of Bingham characteristics of ER/MR fluids with different viscometers", Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); https://doi.org/10.1117/12.472651

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Error analysis

Velocity measurements

Fluid dynamics

Protactinium

Smart materials

Aerospace engineering

Algorithms

Show All Keywords

Keywords/Phrases

Search In:

Publication Years