Publication

Effect of static mixers on expansion and axial dispersion of liquids in fluidized beds at low Reynolds number

Albert Renken
1991
Journal Articles

Abstract

Static mixers as internals in relation to the expansion and dispersion characteristics of a liq. fluidized bed are studied exptl. The column diam. is 39-300 mm. Fluidized-bed reactors equipped with internals exhibit a high hydrodynamic stability accompanied by an increase in the operating range in terms of flow rate by a factor of 4-5, compared with the classical fluidized bed. The axial dispersion of the liq. depends on the Archimedes no. (Ar), the hydraulic diam. of the static mixer, and expansion. The dispersion increases with decreasing Ar and increasing hydraulic diam. of the bed. In general, dispersion is reduced with bed expansion. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/731bfbdb-5deb-4581-9fbd-b995a3fbc176

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Albert Renken
1991
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/731bfbdb-5deb-4581-9fbd-b995a3fbc176

About this result

Related concepts (14)

Reynolds number

In fluid mechanics, the Reynolds number (Re) is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers, flows tend to be turbulent. The turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow (eddy currents).

Dispersion (optics)

In optics and in wave propagation in general, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency; sometimes the term chromatic dispersion is used for specificity to optics in particular. A medium having this common property may be termed a dispersive medium (plural dispersive media). Although the term is used in the field of optics to describe light and other electromagnetic waves, dispersion in the same sense can apply to any sort of wave motion such as acoustic dispersion in the case of sound and seismic waves, and in gravity waves (ocean waves).

Dispersion relation

In the physical sciences and electrical engineering, dispersion relations describe the effect of dispersion on the properties of waves in a medium. A dispersion relation relates the wavelength or wavenumber of a wave to its frequency. Given the dispersion relation, one can calculate the frequency-dependent phase velocity and group velocity of each sinusoidal component of a wave in the medium, as a function of frequency.

Related publications (1)

Effect of static mixers on expansion and axial dispersion of liquids in fluidized beds at low Reynolds number

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