Shear yield stress of partially flocculated colloidal suspensions

AIChE Journal ◽  
1998 ◽  
Vol 44 (3) ◽  
pp. 538-544 ◽  
Author(s):  
Peter J. Scales ◽  
Stephen B. Johnson ◽  
Thomas W. Healy ◽  
Prakash C. Kapur
Keyword(s):  
Yield Stress ◽  
Colloidal Suspensions ◽  
Shear Yield Stress ◽  
Shear Yield

The shear and compressive yield stress of fibrillated acacia pulp fiber suspensions

2020 ◽  
Vol 35 (2) ◽  
pp. 243-250
Author(s):  
Jiulong Sha ◽  
Yueyue Yang ◽  
Can Wang ◽  
Wei Li ◽  
Peng Lu ◽  
...  
Keyword(s):  
Yield Stress ◽  
Paper Industry ◽  
Pulp Fiber ◽  
Fiber Suspensions ◽  
Fiber Morphology ◽  
Shear Yield Stress ◽  
Geometrical Properties ◽  
Compressive Yield Stress ◽  
Shear Yield ◽  
Fiber Cell Wall

AbstractThe degree of interactions between fibers and the tendency of fibers to form flocs play an important role in effective unit operation in pulp and paper industry. Mechanical treatments may damage the structure of the fiber cell wall and geometrical properties, and ultimately change the fiber-fiber interactions. In this study, the gel crowding number, compressive and shear yield stress of fibrillated acacia pulps were investigated, and the results showed that the gel crowding number of the refined pulp samples ranged from 8.7 to 10.7, which were much lower than that of un-refined pulps. As the concentration increased, both the compressive yield stress {P_{y}} and shear yield stress {\tau _{y}} of all suspensions increased accordingly, and the yield stress was found to depend on a power law of the crowding number. Moreover, the values of {\tau _{y}}/{P_{y}} were also examined and the variation of {\tau _{y}}/{P_{y}} became largely dependent on the fiber morphology and mass concentration.

Demonstration of Combined Shear and Squeeze Strengthening Modes in a Searle-Type Magnetorheometer

2013 ◽  
Author(s):  
Andrew C. Becnel ◽  
Norman M. Wereley
Keyword(s):  
Yield Stress ◽  
Energy Absorption ◽  
Shear Yield Stress ◽  
Particle Chain ◽  
Solids Loading ◽  
Mr Fluids ◽  
Shear Yield ◽  
Microstructure Model ◽  
Novel Method ◽  
A Chain

This research details a novel method of increasing the shear yield stress of magnetorheological (MR) fluids by combining shear and squeeze modes of operation to manipulate particle chain structures, to achieve so-called compression-assisted aggregation. The contribution of both active gap separation and particle concentration are experimentally measured using a custom-built Searle cell magnetorheometer, which is a model device emulating a rotary Magnetorheological Energy Absorber (MREA). Characterization data from large (1 mm) and small (250 μm) gap geometries are compared to investigate the effect of the gap on yield stress by compression enhancement. Two MR fluids having different particle concentrations (32 vol% and 40 vol%) are also characterized to demonstrate the effect of solids loading on compression-assisted chain aggregation. Details of the experimental setup and method are presented, and a chain microstructure model is used to explain experimental trends. The torque resisted by practical rotary MREAs is directly related to the strength of the MR fluid used, as measured by the shear yield stress. This study demonstrates that it is feasible, utilizing the compression-enhanced shear yield stress, to either (1) design a rotary MREA of a given volume to achieve higher energy absorption density (energy absorbed normalize by device volume), or (2) reduce the volume of a given rotary MREA to achieve the same energy absorption density.

Compression Enhanced Shear Yield Stress of Electrorheological Fluid

2009 ◽  
Vol 26 (4) ◽  
pp. 048301 ◽  
Author(s):  
Zhang Min-Liang ◽  
Tian Yu ◽  
Jiang Ji-Le ◽  
Zhu Xu-Li ◽  
Meng Yong-Gang ◽  
...  
Keyword(s):  
Yield Stress ◽  
Electrorheological Fluid ◽  
Shear Yield Stress ◽  
Shear Yield

Effect of annealing on the shear yield stress of rejuvenated polycarbonate

Polymer ◽  
1988 ◽  
Vol 29 (11) ◽  
pp. 1985-1989 ◽  
Author(s):  
C. Bauwens-Crowet ◽  
J-C. Bauwens
Keyword(s):  
Yield Stress ◽  
Shear Yield Stress ◽  
Shear Yield

scholarly journals Preliminary experimental evaluation of a novel loudspeaker featuring magnetorheological fluid surround absorber

2020 ◽  
Vol 17 (2) ◽  
pp. 922 ◽  
Author(s):  
Endra Dwi Purnomo ◽  
Ubaidillah Ubaidillah ◽  
Fitrian Imaduddin ◽  
Iwan Yahya ◽  
Saiful Amri Mazlan
Keyword(s):  
Magnetic Flux ◽  
Yield Stress ◽  
Experimental Evaluation ◽  
Flux Distribution ◽  
Magnetic Circuit ◽  
Experimental Result ◽  
The Finite Element Method ◽  
Shear Yield Stress ◽  
Shear Yield ◽  
Novel Design

<span>A novel design of magnetorheological fluids (MRF) based surround device in a loudspeaker system was studied in this article. The main objective of this research is to design a new surround device of the loudspeaker that can be easily controlled its damping. Therefore, it was predicted that the audio pressure level on the loudspeaker could be easily manipulated at a different sound source by applying a certain magnetic field. This function could not be reached using one conventional speaker system. Firstly, a set of an electromagnetic device containing MRF was designed to replace the conventional rubber surround. The magnetic circuit was then evaluated using the finite element method magnetics to study the flux distribution in the MRF area. The current was varied from 0.25 to 0.75 A by an interval of 0.25 A. The magnetic flux resulted from the simulation was then logged and used as the based value for predicting the change of shear yield stress. The base properties of the shear yield stress of the MRF against the magnetic flux was obtained from previous experimental result. Therefore, it was hopefully the prediction could be closed to the real system. Based on the simulation result, the shear yield stress varied from 43 to 49 Mpa or about 15 % increment. </span><span lang="IN">A simple experimental work was carried out. By applying particular direct current into the coil, the sound quality generated by the loudspeaker shows different values</span><span>.</span><span lang="IN"> Based on the preliminary experiment, the level of decibel decreased about 3 dB as the application of magnetic fields. The idea has been proven in this preliminary experimental evaluation.</span>

scholarly journals Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4692
Author(s):  
Daniel Chuchala ◽  
Jakub Sandak ◽  
Kazimierz A. Orlowski ◽  
Tomasz Muzinski ◽  
Marcin Lackowski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Yield Stress ◽  
Mechanical Performance ◽  
Process Analysis ◽  
Beech Wood ◽  
Drying Methods ◽  
Shear Yield Stress ◽  
Cutting Power ◽  
Shear Yield

The modern wood converting processes consists of several stages and material drying belongs to the most influencing future performances of products. The procedure of drying wood is usually realized between subsequent sawing operations, affecting significantly cutting conditions and general properties of material. An alternative methodology for determination of mechanical properties (fracture toughness and shear yield stress) based on cutting process analysis is presented here. Two wood species (pine and beech) representing soft and hard woods were investigated with respect to four diverse drying methods used in industry. Fracture toughness and shear yield stress were determined directly from the cutting power signal that was recorded while frame sawing. An original procedure for compensation of the wood density variation is proposed to generalize mechanical properties of wood and allow direct comparison between species and drying methods. Noticeable differences of fracture toughness and shear yield stress values were found among all drying techniques and for both species, but only for beech wood the differences were statistically significant. These observations provide a new highlight on the understanding of the effect of thermo-hydro modification of wood on mechanical performance of structures. It can be also highly useful to optimize woodworking machines by properly adjusting cutting power requirements.

Developing of the Experimental Device that Test Magneto Rheological Fluid(MRF) Shear Yield Stress Nnder Non Uniform Composite Field

2015 ◽  
Vol 667 ◽  
pp. 385-390
Author(s):  
Wei Zeng Chen ◽  
Guang Zhang ◽  
Xin Sheng He ◽  
Shao Qing Ren ◽  
Peng Huang
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Experimental Device ◽  
Actual Condition ◽  
Shear Yield Stress ◽  
Fluid Shear ◽  
Composite Field ◽  
Shear Yield ◽  
Magneto Rheological ◽  
The Magnetic Field

In order to study magneto rheological fluid shear characteristics developing of magnetic field and temperature field under the actual condition (non-uniform composite field), Experimental device that test magneto rheological fluid (MRF) Shear yield stress under Non uniform composite field was developed. The device of the magnetic field distribution, temperature conductivity, shear yield stress are studied in theory and prototype production, and then testing the Shear yield stress of magneto rheological fluids of different magnetic field, temperature yield . The adjusting range of temperature of the experimental device is for 0-200, the magnetic field adjusting range by adjusting the current of the electromagnetic coil in the 0mt-300mt. Makes the air gap magnetic field intensity is 20mt, magneto rheological fluid in the shear rate at , the research of magneto rheological fluid shear yield stress with the magnetic field variation different temperatures (T=10, T=50, T=100,T=130, T=150, T=170) . The experimental results show that: in the 10-170, the temperature value basically does not affect the shear yield stress of the MR fluid, but the temperature is less than 10 and the temperature is greater than 170, the effects that temperature size on MRF Shear yield stress is relatively large.

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