نتایج جستجو برای: viscosity models

تعداد نتایج: 939215  

Journal: :Bulletin of the National Research Centre 2023

Abstract Background The accurate prediction of viscosity in nanofluids is essential for comprehending their flow behavior and enhancing effectiveness different industries. This research delves into modeling the assessing various models through cross-validation techniques. are compared based on root mean square error sets, which served as selection criteria. main body abstract Four feature algor...

2002
Daniel J. Stein Frank J. Spera

The viscosity of natural rhyolitic melt from Lipari, Aeolian Islands and melt-bubble emulsions (30^50 vol% porosity) generated from Lipari rhyolite have been measured in a concentric cylinder rheometer at temperatures and shear rates in the range 925^1150‡C and 1033^1031:2 s31, respectively, in order to better understand the dependence of emulsion shear viscosity on temperature and shear rate i...

2016
Johannes V. Soulis Dimitrios K. Fytanidis Olga P. Lampri George D. Giannoglou

BACKGROUND The temporal variation of the hemodynamic mechanical parameters during cardiac pulse wave is considered as an important atherogenic factor. Applying non-Newtonian blood molecular viscosity simulation is crucial for hemodynamic analysis. Understanding low density lipoprotein (LDL) distribution in relation to flow parameters will possibly spot the prone to atherosclerosis aorta regions...

2006

Thermal spray has traditionally been used for depositing metallic, carbide and ceramic coatings, however, it has recently been found that the high kinetic energy of the High Velocity Oxy-Fuel (HVOF) thermal spray process also enables the solventless processing of high melt viscosity polymers, eliminating the need for harmful, volatile organic solvents. A primarily goal of this work was to devel...

2006
Thorsten W. Becker

S U M M A R Y Global circulation models are analysed using a temperature and strain-rate dependent rheology in order to refine previous estimates of the nature of mantle flow and plate driving forces. Based on temperature inferred from a tectonic model and seismic tomography, the suboceanic viscosity is lower than underneath continents by ∼ one order of magnitude. If net-rotations of the lithos...

2011
María José Pastoriza-Gallego Luis Lugo José Luis Legido Manuel M Piñeiro

The dispersion and stability of nanofluids obtained by dispersing Al2O3 nanoparticles in ethylene glycol have been analyzed at several concentrations up to 25% in mass fraction. The thermal conductivity and viscosity were experimentally determined at temperatures ranging from 283.15 K to 323.15 K using an apparatus based on the hot-wire method and a rotational viscometer, respectively. It has b...

2010
Ondřej Šrámek Shijie Zhong

[1] A dynamic link between the early evolution of Tharsis and the crustal dichotomy on Mars was recently proposed by Zhong (2009). We address in detail the fundamental aspects of the proposed model using 3‐D spherical shell modeling of convection. We investigate the conditions under which a spherical harmonic degree 1 flow is produced in the mantle of Mars in layered viscosity models with diffe...

2005
Isak Avramov

The paper addresses the properties of glassforming melts in an attempt to predict the dependence of viscosity on temperature and on pressure. A review on the main viscosity models (free volume model, the Adam and Gibbs model etc.) is given. It is demonstrated that the activation energy can be expressed through the glass-transition temperature Tg. The main attention is concentrated on the jump f...

2000
Guowei He Lian-Ping Wang GUOWEI HE

Subgrid-scale (SGS) models for large eddy simulation (LES) have generally been evaluated by their ability to predict single-time statistics of turbulent ows such as kinetic energy and Reynolds stresses. Recent applications of large eddy simulation to the evaluation of sound sources in turbulent ows, a problem in which time correlations determine the frequency distribution of acoustic radiation,...

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