A Numerical Model of Yield Stress Fluid Dynamics in a Mixing Vessel

2002 ◽  
Vol 12 (4) ◽  
pp. 182-191 ◽  
Author(s):  
M. Marouche ◽  
D. Anne-Archard ◽  
H. C. Boisson
Keyword(s):  
Yield Stress ◽  
Laboratory Experiments ◽  
Numerical Study ◽  
High Yield ◽  
Laminar Regime ◽  
Carreau Model ◽  
Global Power ◽  
2D Flow ◽  
Anchor Agitator ◽  
Shear Thinning Fluid

Abstract A numerical study is conducted on the behaviour of yield stress fluids in a mixing vessel equipped with anchor agitator in laminar regime. It is shown that extending a standard Carreau model of shear thinning fluid is a suitable practice. Validations versus Couette flow analytical solution are satisfactory. Main features of local hydrodynamics and global power consumption are described for a 2D flow. Significant changes in the flow pattern are observed for low inertia and high yield stress and the results are considered as guidelines for further laboratory experiments.

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller

2011 ◽  
Vol 32 (4) ◽  
pp. 351-366 ◽  
Author(s):  
Houari Ameur ◽  
Mohamed Bouzit ◽  
Mustapha Helmaoui
Keyword(s):  
Experimental Data ◽  
Fluid Flow ◽  
Power Consumption ◽  
Yield Stress ◽  
Short Distance ◽  
Numerical Study ◽  
Stirred Vessel ◽  
Higher Power ◽  
Shear Thinning Fluid ◽  
Good Agreement

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.

Electrorheological fluid with an extraordinarily high yield stress

2002 ◽  
Vol 80 (5) ◽  
pp. 888-890 ◽  
Author(s):  
Yuling Zhang ◽  
Kunquan Lu ◽  
Guanghui Rao ◽  
Yu Tian ◽  
Shaohua Zhang ◽  
...  
Keyword(s):  
Yield Stress ◽  
Electrorheological Fluid ◽  
High Yield ◽  
High Yield Stress

Impact of Molecular Chain Structure of Suspension Phase on Giant Electrorheological Performance

2022 ◽  
Author(s):  
Hanqi Xu ◽  
Jinbo Wu ◽  
Yaying Hong ◽  
Weijia Wen
Keyword(s):  
Yield Stress ◽  
Chain Length ◽  
Colloidal Stability ◽  
Chain Structure ◽  
Solid Particles ◽  
High Yield ◽  
Suspension Stability ◽  
Chain Lengths ◽  
The Impact ◽  
Oil Particles

Abstract We demonstrate the impact of diester structure, in particular the alkyl chain length and branching structure, on the giant electrorheological (GER) effect and suspension stability. The existence of oil-particles interaction is of critical importance to induce the GER effect. To quantify GER performance and colloidal stability, we examine the yield stress, current density, field-off viscosity and sedimentation ratio with respect to the variation of chain length and branching structure. The oil-particles interaction is quantitatively analyzed by investigating the cluster size of particles in different diesters by a multiple light scattering analyzer, along with the wettability of different chain lengths of diesters and solid particles by the Washburn method. Our results indicate that long chain lengths favor the formation of particle agglomerates, thereby enhancing the GER effect (such as high yield stress). The attachment of branches on diester causes the formation of electronic correlation between branches and main chain, depending on the position of branches located, and hence results in superior GER performance and favorable suspension stability. An optimal GER fluid constituted by bis(2-ethylhexyl) sebacate is acquired with the achieved yield stress of 113 kPa at electric field strength of 4 kV/ mm and the prominent integrated GER properties.

Development of a double magnetic circuit yield stress measurement device for magnetorheological fluid

2016 ◽  
Vol 28 (10) ◽  
pp. 1249-1259 ◽  
Author(s):  
Xiang-Fan Wu ◽  
Xing-Ming Xiao ◽  
Zu-Zhi Tian ◽  
Fei Chen ◽  
Jian Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Magnetic Circuit ◽  
Stress Measurement ◽  
Magnetorheological Fluid ◽  
High Yield ◽  
Magnetic Field Measurement ◽  
Measurement Device ◽  
Accuracy And Repeatability ◽  
The Magnetic Field

On the basis of shear working mode of magnetorheological fluid, in this article, a novel temperature controllable yield stress measurement device is designed, and the double magnetic circuit structure and the heating structure are proposed. And then, the magnetic field and temperature field of the measurement device are simulated, respectively, by the finite element method. Furthermore, several experiments are carried out to evaluate the magnetic field, measurement precision, and repeatability of the self-designed device. The results indicate that the proposed measurement device has uniform magnetic field distribution and controllable temperature and also has high yield stress testing accuracy and repeatability.

Extensive application of TMCP steel plates to ship hulls: 40 kgf/mm2 class high yield stress steel

1988 ◽  
Vol 1 (3) ◽  
pp. 219-243 ◽  
Author(s):  
Susumu Machida ◽  
Hiroshige Kitada ◽  
Hiroshi Yajima ◽  
Akinobu Kawamura
Keyword(s):  
Yield Stress ◽  
Steel Plates ◽  
High Yield ◽  
Ship Hulls ◽  
High Yield Stress

The thermal bar

1992 ◽  
Vol 236 ◽  
pp. 27-42 ◽  
Author(s):  
S. S. Zilitinkevich ◽  
K. D. Kreiman ◽  
A. Yu. Terzhevik
Keyword(s):  
Laboratory Experiments ◽  
Heat Budget ◽  
Traditional Approach ◽  
Laminar Regime ◽  
Laboratory Measurements ◽  
Cold Zone ◽  
Thermal Bar ◽  
Simple Theoretical Model ◽  
Theoretical Predictions ◽  
Zone Ii

A simple theoretical model of the thermal bar is derived on the basis of heat budget equations for the following three zones of a wedge-shaped water basin warmed from above: (i) stably stratified shallow warm-water zone; (ii) vicinity of the bar; (iii) convectively mixed deep cold zone. In contrast to the traditional approach, advective warming of the vicinity of the bar and associated facilitating of the thermal bar propagation are taken into account. Theoretical predictions are compared with the data of lacustrine and laboratory measurements taken from current literature. New laboratory experiments have been carried out to examine the laminar regime of the thermal bar.

Numerical study of the combined effects of inertia, slip, and compressibility in extrusion of yield stress fluids

2014 ◽  
Vol 53 (10-11) ◽  
pp. 791-804 ◽  
Author(s):  
Zacharias Kountouriotis ◽  
Georgios C. Georgiou ◽  
Evan Mitsoulis
Keyword(s):  
Yield Stress ◽  
Numerical Study ◽  
Combined Effects ◽  
Yield Stress Fluids

Removable equipment designed to transport timber: new engineering solutions and application of high-yield-stress steel

2020 ◽  
Vol 17 (1) ◽  
pp. 117-128
Author(s):  
N. A. Tanicheva ◽  
◽  
I. V. Fedorov ◽  
I. O. Filippova ◽  
◽  
...  
Keyword(s):  
Yield Stress ◽  
High Yield ◽  
High Yield Stress

Flow Behavior of Fe-3%Si Steel at High Temperatures and Strain Rates

2011 ◽  
Vol 704-705 ◽  
pp. 928-934
Author(s):  
Feng Hui An ◽  
Yu Hui Sha ◽  
Liang Zuo
Keyword(s):  
Yield Stress ◽  
Flow Behavior ◽  
Simulation Method ◽  
Strain Rate Range ◽  
High Yield ◽  
Strain Rates ◽  
Isothermal Compression ◽  
Steady State Flow ◽  
Hot Deformation Behavior ◽  
Controlling Mechanism

Hot deformation behavior of Fe-3%Si steel within temperature range of 1073~1473K and strain rate range of 0.01~5s−1was investigated by isothermal compression test using thermo-simulation method. Over the applied deformation conditions, steady state flow behavior was well described by the power law relationship with dislocation climb as the rate-controlling mechanism, and the high apparent activation energy can be attributed to the high yield stress. A modified Bergström model was proposed by introducing yield stress, and consequently the whole stress-strain curves can be accurately predicted.

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