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Volume fraction

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


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors investigated magnetic field-induced chain formation of superparamagnetic latex particles via optical microscopy and digital image analysis and found that the mean chain size has a power-law dependence on time, as predicted by the Smoluchowski equation and threedimensional simulations of diffusion-limited aggregation of oriented particles.
Abstract: Magnetic‐field‐induced chain formation of superparamagnetic latex particles is investigated via optical microscopy and digital image analysis. Our experiment is unique in that the aggregation process takes place in the bulk, where particles are free to diffuse in three dimensions, rather than on a surface. We find that the mean chain size 〈s(t)〉 has a power‐law dependence on time, 〈s(t)〉∼tz, as predicted by the Smoluchowski equation and three‐dimensional simulations of diffusion‐limited aggregation of oriented particles. The value of the exponent z is found to have a weak inverse dependence on particle volume fraction φ and dimensionless dipole strength λ. We propose a new model for a characteristic time scale proportional to 1/λ and 1/φ. Comparison with experimental observations shows this scaling to be very effective but to break down suddenly above a critical volume fraction.

180 citations

Journal ArticleDOI
TL;DR: In this paper, an experimental work on the measurement of effective electrical conductivity of aqueous suspensions of aluminum oxide nanoparticles (nanofluids) was performed both as a function of volume fraction and temperature.

180 citations

Journal ArticleDOI
TL;DR: In this paper, the age-hardening precipitation reactions in aluminum matrix composites reinforced with discontinuous SiC were studied using a calorimetric technique, and it was found that the overall agehardening sequence of the alloy was not changed by the addition of SiC, but that the volume fractions of various phases and the precipitation kinetics were substantially modified.
Abstract: The age-hardening precipitation reactions in aluminum matrix composites reinforced with discontinuous SiC were studied using a calorimetric technique. Composites fabricated with 2124, 2219, 6061, and 7475 alloy matrices were obtained from commercial sources along with unreinforced control materials fabricated in a similar manner. The 7475 materials were made by a casting process while the others were made by powder metallurgy: the SiC reinforcement was in the form of whiskers or particulate. It was found that the overall age-hardening sequence of the alloy was not changed by the addition of SiC, but that the volume fractions of various phases and the precipitation kinetics were substantially modified. Precipitation and dissolution kinetics were generally accelerated. A substantial portion of this acceleration was found to be due to the powder metallurgy process employed to make the composites, but the formation kinetics of some particular precipitate phases were also strongly affected by the presence of SiC. It was observed that the volume fraction of GP zones able to form in the SiC containing materials was significantly reduced. The presence of SiC particles also caused normally quench insensitive materials such as 6061 to become quench sensitive. The microstructural origins of these effects are discussed.

180 citations

Journal ArticleDOI
TL;DR: A new model is proposed for the effective permeability of a species in MMMs, which takes into account the presence of interfacial layer at the surface of the core filler particles.

179 citations

Journal ArticleDOI
TL;DR: In this article, the dual continuous flow pattern (both phases retain their continuity at the top and bottom of the pipe while there is interdispersion), which occurs during the pipe flow of two immiscible liquid phases, was studied in detail, and pressure gradient, in situ volume fraction and phase distribution data were obtained.

179 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023965
20222,020
2021744
2020736
2019786
2018696