Effect of curvature on the flow of an electrorheological fluid through an annular duct

Chun Ying Lee, Gong Jih Chao, Jian Da Wu

Research output: Contribution to journalArticle

Abstract

The flow characteristics of the ER fluid through an annular duct are considered in this study. The ER fluid is modeled as a bi-viscous fluid in contrast to frequently used Bingham model. The curvature of the annular duct alters not only the flow dynamics but the electric field distribution through the gap height comparing to its rectangular counterparts. Both effects are included in this study. However, the flow-induced electric field modification is not considered. The calculated results of the numerical examples show that for an annular duct with inner radius to gap height ratio (a/h) > 2, the design formula adopted from rectangular ducts can be used without causing significant error. Nevertheless, for an annular duct with a/h < 1 the adoption of the formula for rectangular ducts can cause serious error except for the ER fluid with an electric-field dependence parameter close to 2.0. An experimental setup is employed to validate some calculated results.

Original languageEnglish
Pages (from-to)345-353
Number of pages9
JournalJournal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
Volume23
Issue number4
Publication statusPublished - 2002 Aug 1

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Annular ducts
Electrorheological fluids
Fluids
Electric fields
Ducts

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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abstract = "The flow characteristics of the ER fluid through an annular duct are considered in this study. The ER fluid is modeled as a bi-viscous fluid in contrast to frequently used Bingham model. The curvature of the annular duct alters not only the flow dynamics but the electric field distribution through the gap height comparing to its rectangular counterparts. Both effects are included in this study. However, the flow-induced electric field modification is not considered. The calculated results of the numerical examples show that for an annular duct with inner radius to gap height ratio (a/h) > 2, the design formula adopted from rectangular ducts can be used without causing significant error. Nevertheless, for an annular duct with a/h < 1 the adoption of the formula for rectangular ducts can cause serious error except for the ER fluid with an electric-field dependence parameter close to 2.0. An experimental setup is employed to validate some calculated results.",
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