A general correlation for the minimum spouting velocity

Abstract

In this paper new correlations are developed, for cases where the height of the bed to column diameter ratio (H/D c ) is below and above unity. Based on 356 published data points (16 different sources with 23 different solids with a wide range of variables) along with those of the author are used for developing the correlations. The present proposed equations are more exact and simpler to use than previous empirical correlation.

Magnetically assisted gas–solid fluidization in a tapered vessel: First report with observations and dimensional analysis

“…The common dimensionless groups (see (1a)-(1c)) are the particle-diameter-based Reynolds number Re p−Ums = U ms d p f / f (Aravinth and Murugesan, 1997;Mgalhaes and Pinho, 2006) and the Archimedes number (Costa and Taranto, 2003;Sau et al, 2006). In some correlations (He et al, 1997), additional Froude number gd p /U 2 0 is used.…”

“…Commonly the critical gas velocities (U ms ) are normalized (scaled) by 2gh b (Wu et al, 1987;Sau et al, 2006) as in (1b) or through the particle diameter based Reynolds number Re p−Ums = U ms d p f /Á f (Aravinth and Murugesan, 1997;Mgalhaes and Pinho, 2006) with U ms defined by the cross-sectional area of the gas inlet orifice. In other cases dimensional correlations are used such as (Costa and Taranto, 2003):…”

Parameter Sensitivity Analysis of a Spouted Bed

“…The most important aspect of the spouted bed is the recirculation of solid particles between the spout and annulus [3]. This contact is indicated [1] for applications where a vigorous movement of the solid is required, e.g., the handling of solids that are sticky, have irregular texture, or have a large particle size.…”

“…A spouted bed is a device for generating an efficient fluid-solid contact, indicated especially when the solids are uniformly coarse [1,2]. In these beds, a jet of fluid enters a cylindrical or conical vessel containing the solids.…”