Journal ArticleDOI
Super-strong magnetorheological fluids
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TLDR
In this paper, a compression-assisted aggregation process was developed to change the induced magnetic microstructure of magnetorheological fluids to a structure that consists of robust thick columns with strong ends.Abstract:
Magnetorheological (MR) fluids, which can rapidly be changed from a liquid state to a solid state and vice versa by a magnetic field, have the potential to revolutionize several industrial sectors The key issue is to enhance their yield shear stress This paper reviews the physical mechanism and microstructure of MR fluids It finds that the weak points of the MR microstructure under a shear force are at the chains' ends Hence, a general technique, a compression-assisted-aggregation process, is developed to change the induced MR structure to a structure that consists of robust thick columns with strong ends The scanning electronic micrographic (SEM) images confirm such a structure change With this approach, MR fluids become super-strong The enhanced yield stress of MR fluids reaches 800 kPa at a moderate magnetic fieldread more
Citations
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Journal ArticleDOI
Preparation and controlled self-assembly of Janus magnetic nanoparticles.
Marco Lattuada,T. Alan Hatton +1 more
TL;DR: Control aggregation of the Janus nanoparticles was observed at low pH values, with the formation of stable clusters of approximately 2-4 times the initial size of the particles, and Monte Carlo simulation results compared favorably with experimental observations.
Journal ArticleDOI
Magnetorheology of soft magnetic carbonyl iron suspension with single-walled carbon nanotube additive and its yield stress scaling function
TL;DR: In this paper, the authors introduced fibrous single-walled carbon nanotube (SWNT) into carbonyl iron (CI) based magnetorheological (MR) fluid, to resolve the undesirable sedimentation.
Journal ArticleDOI
Reducing the Viscosity of Crude Oil by Pulsed Electric or Magnetic Field
R. Tao and,X. Xu +1 more
TL;DR: In this paper, a method with pulsed electric or magnetic field to reduce the viscosity of crude oil is developed, which does not change the temperature of the crude oil; instead, it temporary aggregates paraffin particles or asphaltene particles inside crude oil into large ones.
Journal ArticleDOI
Fluid flow analysis of magnetorheological abrasive flow finishing (MRAFF) process
TL;DR: In this article, a capillary viscometer has been designed and fabricated to study the effect of magnetic field on the rheological properties of the medium, and normal force on the abrasive particles is calculated from the applied magnetic field.
Journal ArticleDOI
Theoretical and experimental studies on a magnetorheological brake operating under compression plus shear mode
Chiranjit Sarkar,Harish Hirani +1 more
TL;DR: In this article, an application of compressive force on MR fluid has been proposed to increase the torque capacity of magnetorheological brake, which is based on the idea that an increase in yield stress increases the braking torque.
References
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Journal ArticleDOI
Induced Fibration of Suspensions
TL;DR: In this article, the authors describe some of the phenomena found to have their origin in electrically induced fibration of small particles in fluid liquid suspension, including the induced shear resistances found in layers of the fluid when bounded by potentialized electrode surfaces.
Journal ArticleDOI
Three-dimensional structure of induced electrorheological solid
Rongjia Tao,J. M. Sun +1 more
TL;DR: The induced electrorheological solid has thick columns in the field direction ({ital z} axis), spreading between two electrodes, and can be regarded as a compound of chains of class {ital A} and {ital B}, where chains{ital B} are obtained from chains {ital a} by shifting a distance in the {ital z}.
Journal ArticleDOI
Shear stresses in magnetorheological fluids: Role of magnetic saturation
J. M. Ginder,L. C. Davis +1 more
TL;DR: In this article, the interparticle forces and resulting shear stresses in a magnetorheological fluid are calculated from a finite element analysis in which the nonlinearity and saturation of the particle magnetization are incorporated.
Journal ArticleDOI
Magnetorheological Fluids: Materials, Characterization, and Devices:
TL;DR: Magnetorheological (MR) fluids consist of stable suspensions of magnetic particles in a carrying fluid as discussed by the authors, which is one of the direct influences on the mechanical properties of a magnetic fluid.
Journal ArticleDOI
Structure-enhanced yield stress of magnetorheological fluids
TL;DR: In this article, the authors improved the yield stress of magnetorheological (MR) fluids by changing the fluid microstructure, which can reach as high as 800 kPa under a moderate magnetic field.
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