Volume fraction

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

The Void Fraction in Subcooled Boiling—Prediction of the Initial Point of Net Vapor Generation

Abstract: The satisfactory prediction of the vapor volume fraction in subcooled boiling depends in large part on the ability to predict the point where a significant amount of net vapor is first formed. A method for the prediction of this point is derived here and compared with experimental measurements at both low and high fluid velocities. The derived relationships for this point include the effect of fluid properties, geometry, and the liquid velocity. A comparison with the empirical formula of Bowring [2] for water is given.

Viscoelastic material functions of noncolloidal suspensions with spherical particles

Abstract: We have characterized various steady and time-dependent material functions of suspensions of a non-Newtonian binder, poly(dimethyl siloxane), incorporated with 10%–60% by volume of hollow and spherical glass beads The material functions included storage and the loss moduli, shear stress and first normal stress difference growth and relaxation, relaxation modulus upon step strain and creep and recovery behavior Both constant shear stress and shear rate experiments were carried out using multiple rheometers over a broad temperature range (−35 to 40 °C) while following sample fracture and wall slip effects With increasing volume fraction, φ, of the noncolloidal particles, the strain range, over which linear viscoelastic behavior is observed, became narrower and the relaxation time of the suspension increased Increasing solid content gave rise to the development of the yield stress and the dependence of large amplitude oscillatory shear properties on time and deformation history The yield stress values i

Tunneling giant magnetoresistance in heterogeneous F e − S i O 2 granular films

Abstract: Magnetic and transport properties are examined for heterogeneous ${\mathrm{F}\mathrm{e}\ensuremath{-}\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ granular films prepared on glass substrates by rf sputtering. The superparamagnetic nature and the tunneling giant magnetoresistance are observed in the films having Fe volume fractions smaller than 45%. The magnetization and magnetoresistance (MR) curves are systematically analyzed by the summation of two Langevin functions. The dependence of the MR ratio on the Fe volume fraction is explained phenomenologically by the distance between the nearest-neighbor grain surfaces. The temperature dependence of the MR ratio is also discussed.