J.F. Richardson

TL;DR: In this paper, a series of new correlations for the drag force on a sphere moving in a fluid have been proposed, each covering a wide range of particle Reynolds number Re(10−2 < Re < 3 × 105) by choice of the appropriate form iterative calculations can be avoided.

TL;DR: In this article, the published correlations for the velocity voidage relationship observed during fluidization and sedimentation of uniformly sized spherical particles in solid-liquid systems are compared with published experimental results and it is found that the expression suggested by Richardson and Zaki represents the experimental data well over a wide range of values of Galileo number (10−2 < Ga< 1010) and voidage (0·4 < ϵ < 1).

TL;DR: In this article, a simple model for sedimentation of particles of mixed sizes was developed for binary systems and a correction factor was determined to allow for the interactions between particles settling at ditterent velocities.

TL;DR: In this paper, a model for solid mixing, based on the combined effects of diffusive and convective mechanisms, has been used in conjunction with the experimental resumption of lead glass spherical particles.

TL;DR: In this article, heat transfer coefficients have been measured for transfer between a small immersed electrically heated surface and both liquids and liquid-solid fluidised beds, and Maxima in the heat transfer coefficient-voidage relations are satisfactorily predicted.