Apparent Viscosity In Mining
Influence of surface property of CaCO3 fillers on apparent viscosity …
The apparent viscosity of the composites was tested on Discovery HR-1 rheometer (TA Instrument, New Castle, USA) on a 20 mm flat plate with a 500 µm gap and the thixotropy index was evaluated at practical shear rates of 1 s −1 and 20 s −1 commonly adopted in the industrial lab for sealant composites [26]. The viscosity data were …
Lattice Boltzmann Modeling of the Apparent Viscosity of …
The thinning-then-thickening curve of apparent viscosity versus shear rate for the thinning–elastic fluids has never been studied in any pore-scale simulations. In this paper, we develop an LB model to investigate the apparent viscosity of the thinning–elastic fluid in porous media.
(PDF) Viscosity
PDF | The science of rheology, concerning the deformation of the ground, has three basic aspects: viscosity, elasticity, and plasticity. Viscosity is... | Find, read and cite all the research you ...
Flow Curves of a Herschel-Bulkley
Details. This Demonstration plots shear stress versus shear rate and apparent viscosity versus shear rate using the Herschel–Bulkley model,, where is the yield stress (in Pa), the consistency (in ), and the flow index (dimensionless). (is in Pa and is in Pa s.)The apparent viscosity is calculated as .When and, the model describes a Newtonian fluid; when and …
The effect of electric double layers, zeta potential and pH on apparent …
We report on results with respect to the effect of pH in the range 9 through 12 and of Debye length on apparent viscosity and spatial suspension structures, particularly at higher solids volume fractions, and on the effect of flow reversals. ... including those for text and data mining, AI training, and similar technologies. For all open access ...
Basics of viscometry | Anton Paar Wiki
The term 'viscosity' gives information on how thick a fluid is and how it flows. Learn about what influences flow behavior and different types of viscosity.
Apparent viscosity changes of coal-oil slurry duringheating …
The changes of apparent viscosity of coal-oil slurries with temperature during direct coal liquefaction were studied. Several factors influencing the viscosity of coal slurries were discussed, which include solvent properties, coal concentrations, moisture content, macerals of coal, shear rate, temperature, swelling behavior, etc.
Mathematical models of apparent viscosity as a …
Apparent viscosity, an important rheological index, is inuenced by several factors, including hydration degree, thixotropy, and the dosage of additives and admixtures 14 . e experimental ...
Influence of Natural Additive on Slurryability and
The reduction in apparent viscosity may be due to the reduction of particle agglomeration and weak van der Waals force of attraction between iron ore particles in a slurry-additive mixture. Effect of solid concentration on apparent viscosity. The impact of solid concentration on the apparent viscosity of the suspension is plotted (Fig. 6a). The ...
Apparent Viscosity
Apparent viscosity is a measure of a fluid's resistance to flow under applied shear stress, which is not constant but varies with shear rate and temperature. This non …
Dilatant Fluid
For Newtonian fluids, the apparent viscosity is the same as the dynamic viscosity because n is equal to 1. Pseudoplastic fluids have an n <1 and dilatant fluids have an n >1. One more classification of fluids is a Bingham plastic fluid.
Viscosity
Apparent viscosity is a calculation derived from tests performed on drilling fluid used in oil or gas well development. These calculations and tests help engineers develop and …
Apparent Viscosity of Milk and Cultured Yogurt
The apparent viscosity of unheated (raw) milk was 1.7 cp. The apparent viscosity of yogurt prepared from UHT-treated milk became nearly constant at 0.8 cp after 14 min of shearing, while the apparent viscosity of yogurts prepared from vat-treated milks ranged from 1.8 to 3.8 cp under the same conditions. All yogurts exhibited thixotrophic …
Modeling apparent viscosity of waxy crude oils doped with polymeric …
The present work aims to evaluate the apparent viscosity of waxy crude oils in two conditions: without presence of polymers and doped with them. To reach this purpose, a comprehensive databank consists of 622 actual values of waxy crude oils' apparent viscosity were gathered.
Apparent and plastic viscosities prediction of water-based …
The most common way to assess and improve the performance of drilling fluids is by investigating their rheological properties such as apparent and plastic …
Prediction of defluidization behavior using particle apparent viscosity
The commercial utilization of fluidized beds is usually limited by particle agglomeration and subsequent defluidization. In this paper, a new mathematical model based on force balance is proposed to predict the defluidization behavior of particles in fluidized beds. In this model, the cohesive forces between particles are characterized …
A semi-empirical model to estimate the apparent viscosity …
A semi-empirical model was proposed to estimate the apparent viscosity of gas-fluidized suspensions. This new model was derived by assuming that a sus…
Modeling apparent viscosity of waxy crude oils doped …
Intelligent models are developed to predict viscosity of waxy crude oils doped with polymeric wax inhibitors. • Leverage technique is used for the purpose of outlier identification. • Sensitivity analysis is performed on the apparent viscosity of waxy crude oil with the help of relevancy factor. •
Investigation of the local apparent viscosity in a stirred tank …
The local apparent viscosity in a cylindrical stirred tank was investigated using Particle Image Velocimetry in a shear-thinning fluid. Two impellers …
What Drillers Need to Know About Viscosity
Plastic viscosity is the resistance to the flow of a fluid in bores. This resistance is caused by the mechanical friction within the …
Energies | Free Full-Text | Apparent Viscosity Prediction of …
Apparent viscosity is of one of the main rheological properties of drilling fluid. Monitoring apparent viscosity during drilling operations is very important to prevent various drilling problems and improve well cleaning efficiency. Apparent viscosity can be measured in the laboratory using rheometer or viscometer devices. However, this …
Learn about Viscosity and Viscometry | AMETEK …
Explore AMETEK Brookfield Customer Learning Center to learn about viscosity, materials flow behavior, importance of conducting rheological measurements, and more.
Frontiers | Characterization of magnetorheological fluids …
It can be seen from Figure 11 the apparent viscosity curve shows an obvious shear thinning phenomenon over 10 1 s − 1 – 10 5 s − 1. When the shear rate is larger than 10 4 s − 1, the phenomenon of shear thinning of the apparent viscosity is reduced, and the apparent viscosity is close to zero field viscosity .
(dynamic) viscosity, µ 2 f
The apparent viscosity, µ app, is the viscosity at the local conditions as shown in the plot below (for a Newtonian fluid the apparent viscosity remains constant).
Apparent Viscosity Evolution of Copper Converter Slag …
Decreasing copper content in slag is critical for improving copper recovery, where apparent viscosity is the main factor affecting the separation of matte/copper …
Modeling apparent viscosity of waxy crude oils doped with …
The present work aims to evaluate the apparent viscosity of waxy crude oils in two conditions: without presence of polymers and doped with them. To reach this purpose, a comprehensive databank consists of 622 actual values of waxy crude oils' apparent viscosity were gathered.
Effects of erythrocyte deformability and aggregation on the …
Due to the opposing effects of the cell free layer lubrication and the high viscosity of cell-concentrated core, the influence of aggregation is complex but the lubrication effect appears to dominate, causing the relative apparent viscosity to decrease with aggregation.
Chapter 1 Non-Newtonian Fluids: An Introduction
Animal waste slurries from cattle farms Mine tailings and mineral suspensions Biological fluids (blood, synovial fluid, saliva, etc.) Molten lava and magmas ... circumstances, the apparent viscosity of certain materials is not only a function of flow conditions (geometry, rate of shear, etc.), but it also depends on the kinematic ...
Apparent Viscosity Prediction of Water-Based Muds Using
Apparent viscosity is of one of the main rheological properties of drilling fluid. Monitoring apparent viscosity during drilling operations is very important to …
Preparation and Rheological Properties of the PVA/CMC/Gel …
When the fixed cross-linking agent amount was 2 and 4 g, the apparent viscosity of the composite gel increased as the proportion of PVA in the polymer increased. Additionally, the apparent viscosity of the composite gel decreased with an increasing shear rate, indicating a typical shear thinning non-Newtonian fluid behavior.
A semi-empirical model to estimate the apparent viscosity of …
A semi-empirical model was proposed to estimate the apparent viscosity of gas-fluidized suspensions. This new model was derived by assuming that a sus…
Non-Newtonian Fluids: An Introduction | SpringerLink
Conversely, the apparent viscosity, defined as (sigma /dot{gamma }), is not constant and is a function of σ or (dot{gamma }). Indeed, under appropriate circumstances, the apparent viscosity of certain materials is not only a function of flow conditions (geometry, rate of shear, etc.), but it also depends on the kinematic history of ...
Apparent viscosity
The apparent viscosity is but one of many calculations derived from tests performed on the drilling fluid. These calculations and tests help the mud engineer develop and maintain the properties of the drilling fluid to the specifications required.