Volume fraction

About: Volume fraction is a research topic. Over the lifetime, 16312 publications have been published within this topic receiving 374181 citations.

High-Temperature Tensile Strength of Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy (High-Entropy Alloy)

Abstract: Homogenizing at 1220°C for 20 h and subsequent aging at 900°C for 5 h and 50 h of a novel Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy (high-entropy alloy) produces a microstructure consisting of an L12 ordered γ′ phase embedded in a face-centered cubic solid-solution γ matrix together with needle-like B2 precipitates (NiAl). The volume fraction of γ′ phase is ~46% and of needle-like B2 precipitates <5%, which is in accordance with the prediction of calculation of phase diagram method (CALPHAD using Thermo-Calc software with TTNi7 database; Thermo-Calc Software, Stockholm, Sweden). The high-temperature tensile tests were carried out at room temperature, 600°C, 700°C, 800°C, and 1000°C. The tensile strength as well as the elongation to failure of both heat-treated specimens is very high at all tested temperatures. The values of tensile strength has been compared with literature data of well-known Alloy 800H and Inconel 617, and is discussed in terms of the observed microstructure.

Acoustic Spectroscopy for Concentrated Polydisperse Colloids with High Density Contrast

Abstract: The mechanisms of sound attenuation are different in dispersions with low and high density contrast. “Viscous losses” are dominant in high density contrast dispersions whereas “thermal losses” predominate in dispersions with low density contrast. The rutile dispersion is chosen as an instance of the high density contrast system. The dispersion of the neoprene latex is an instance of the low density contrast system. The dilution experiment performed with both systems shows that the role of the particle−particle interaction is quite different in these two dispersions. The measured spectra show that attenuation remains a linear function of the volume fraction in the latex dispersion even at 30 vol %. At the same time, attenuation exhibits a nonlinear dependence on the volume fraction for the rutile dispersion even at 10 vol %. This difference means that particle−particle interaction contributes more to the “viscous losses” than to the “thermal losses”. We associate this effect with the difference between “vi...

Statistical investigation for developing a new model for rheological behavior of Silica–ethylene glycol/Water hybrid Newtonian nanofluid using experimental data

Abstract: In this experimental investigation, we developed a new model for rheological behavior of Silica–Ethylene glycol/Water (30: 70 vol %) hybrid Newtonian nanofluid The tests were carried out in volume fractions of 01%, 025%, 05%, 075%, and 15%, the temperature range from 25 °C to 50 °C, and in the shear rate range 2448 s − 1 to 7344 s − 1 It can be deduced that the obtained correlation is a suitable model for estimating the desired nanofluid viscosity Also, as the volume fraction increases, the relative viscosity increases due to the greater dispersion of the nanoparticles in the base fluid The maximum marginal deviation values in this graph are shown to be equal to 137% This value is acceptable for an experimental correlation We find that the relationship between shear stress and shear rate is linear; then the desired fluid is Newtonian At the maximum volume fraction, the percentage of loss of viscosity from the minimum temperature to the maximum temperature is 89% In addition, at maximum operating temperature, the percentage increase in relative viscosity in the maximum volume fraction relative to the minimum fraction is 48%

Investigation of mixture fluid suspended by hybrid nanoparticles over vertical cylinder by considering shape factor effect

Abstract: In this study, flow of a mixture of water and ethylene glycol (50–50%) with hybrid nanoparticles (MWCNT–Ag) over a vertical stretching cylinder has been investigated. In this research, the fluid passes through a porous media, while a magnetic field has been applied to the system. Furthermore, the effects of thermal radiation, viscous dissipation, and natural convection have been studied. As a novelty, the effects of different shape factors have been investigated. In the first step, the governing equations are extracted from partial differential equations and then converted to ordinary differential equations (ODE) using the similarity solution. In the next step, the fifth-order Runge–Kutta method has been used to solve the related ODEs. The effects of parameters such as magnetic field, radiation parameter, porosity parameter, nanofluid volume fraction, and nanofluid shape factor on dimensionless velocity and temperature profile have been presented for single and hybrid nanofluid. The results showed that at $$\eta$$ = 2.5 for hybrid nanoparticles the shape factors lamina and spherical have the largest difference; lamina is smaller by 6%, also the results demonstrated that at $$\eta$$ = 2 with increasing Ha, the radial velocity reduced 9.68% for hybrid nanoparticles.