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The gas flow rate is introduced at the bottom of the column through a gas distributor. [1] The gas is supplied in the form of bubbles to either a liquid phase or a liquid-solid suspension. In this case, the solid particle size (typically a catalyst ) ranges from 5 to 100 μm.
Elutriation is a process for separating particles based on their size, shape and density, using a stream of gas or liquid flowing in a direction usually opposite to the direction of sedimentation. This method is mainly used for particles smaller than 1 μm.
When fluidized, a bed of solid particles will behave as a fluid, like a liquid or gas. Like water in a bucket: the bed will conform to the volume of the chamber, its surface remaining perpendicular to gravity; objects with a lower density than the bed density will float on its surface, bobbing up and down if pushed downwards, while objects with ...
The upstream volumetric flow rate is lower than the downstream condition because of the higher upstream density. The choked velocity is a function of the upstream pressure but not the downstream. Although the velocity is constant, the mass flow rate is dependent on the density of the upstream gas, which is a function of the upstream pressure.
The groups are defined by their locations on a diagram of solid-fluid density difference and particle size. Design methods for fluidised beds can be tailored based upon the particle's Geldart grouping: [11] Group A For this group the particle size is between 20 and 100 μm, and the particle density is typically less than 1.4g/cm 3. Prior to the ...
is the density of fluid, μ {\displaystyle \mu } is the dynamic viscosity of the fluid, v s {\displaystyle v_{s}} is the superficial velocity (i.e. the velocity that the fluid would have through the empty tube at the same volumetric flow rate),
ρ L is the liquid density in kg/m 3 ρ V is the vapor density in kg/m 3 k = 0.107 m/s (when the drum includes a de-entraining mesh pad) Then the cross-sectional area of the drum can be found from: = ˙ where ˙ is the vapor volumetric flow rate in m 3 /s A is the cross-sectional area of the drum
The rate at which sedimentation occurs is an important characteristic of the decanter centrifuge separation process. The sedimentation rate is influenced by the particle size, the shapes of the particles, their density differential between solid and liquid and the viscosity of the liquid. This process characteristic can be improved by utilizing ...