Dielectric relaxation effect on flow behavior of electrorheological fluids

被引：9

作者：

Wang, Zhiyuan ^{[1
]}

Gong, Xinglong ^{[1
]}

Yang, Fan ^{[1
]}

Jiang, Wanquan ^{[2
]}

Xuan, Shouhu ^{[1
]}

机构：

[1] Univ Sci & Technol China USTC, CAS Key Lab Mech Behav & Design Mat, Dept Modern Mech, Hefei 230027, Peoples R China

[2] Univ Sci & Technol China USTC, Dept Chem, Hefei 230027, Peoples R China

来源：

JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES | 2015年 / 26卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Electrorheological fluids; break shear rate; relaxation time; flow curve; RHEOLOGICAL PROPERTIES; SUSPENSIONS; MECHANISMS; PARTICLES; TIO2;

D O I：

10.1177/1045389X14536007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dielectric relaxation effect on the flow behavior of electrorheological fluids under dynamic shear was studied. The flow curves of electrorheological fluids in the dynamic state were simulated with shear rates from 0.1 to 1000 s(-1) under different relaxation times. When the magnitude of the relaxation time is smaller than 10(-2) s, the break shear rate changes little at different relaxation times. But the break shear rate changes obviously when the magnitude of the relaxation time is larger than 10(-2) s. To further understand the influence of the relaxation time, Sr/Ba-doped TiO2 electrorheological fluids were prepared and their dielectric properties and flow curves under shear flow were tested. The relaxation time of the electrorheological fluid is influenced by the Sr/Ti mole ratio but not the Ba/Ti mole ratio, and the electrorheological effects of the fluids were highly influenced by varying the Sr/Ti mole ratios. The experimental results agreed well with the above computer simulation. Finally, a possible mechanism was proposed to explain the effect of dielectric relaxation on flow behavior of electrorheological fluids.

引用

页码：1141 / 1149

页数：9

共 31 条

[1] Shear stress analysis of a semiconducting polymer based electrorheological fluid system [J].

Cho, MS ;

Choi, HJ ;

Jhon, MS .

POLYMER, 2005, 46 (25) :11484-11488

[2] Synthesis and electrorheological characteristics of polyaniline-coated poly(methyl methacrylate) microsphere: Size effect [J].

Cho, MS ;

Cho, YH ;

Choi, HJ ;

Jhon, MS .

LANGMUIR, 2003, 19 (14) :5875-5881

[3] Electrorheology of polymers and nanocomposites [J].

Choi, Hyoung Jin ;

Jhon, Myung S. .

SOFT MATTER, 2009, 5 (08) :1562-1567

[4]

Choi Y., 1990, Journal of Intelligent Material Systems and Structures, V1, P91, DOI 10.1177/1045389X9000100106

[5] Critical role of flow-modified permittivity in electrorheology: Model and computer simulation [J].

Dassanayake, UM ;

Offner, SSR ;

Hu, Y .

PHYSICAL REVIEW E, 2004, 69 (02) :021507-1

[6] POLARIZATION FORCES AND CONDUCTIVITY EFFECTS IN ELECTRORHEOLOGICAL FLUIDS [J].

DAVIS, LC .

JOURNAL OF APPLIED PHYSICS, 1992, 72 (04) :1334-1340

[7] Electrorheological behavior of urea-doped mesoporous TiO2 suspensions [J].

Di, Kai ;

Zhu, Yihua ;

Yang, Xiaoling ;

Li, Chunzhong .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2006, 280 (1-3) :71-75

[8] Boundary effect in electrorheological fluids [J].

Gong, X. L. ;

Yang, F. ;

Xuan, S. H. ;

Zong, L. H. ;

Zhu, W. ;

Jiang, W. Q. .

PHYSICAL REVIEW E, 2011, 84 (06)

[9] Computer simulation of structures and rheological properties of electrorheological fluids [J].

Guo, HX ;

Mai, ZH ;

Tian, HH .

PHYSICAL REVIEW E, 1996, 53 (04) :3823-3831

[10] ELECTRORHEOLOGICAL FLUIDS [J].

HALSEY, TC .

SCIENCE, 1992, 258 (5083) :761-766

← 1 2 3 4 →