Minimum Fluidization Velocity - Fluid Mechanics - Lecture Notes, Study notes for Fluid Mechanics. Birla Institute of Technology and Science

Fluid Mechanics

Description: The key points are: Minimum Fluidization Velocity, Packed Beds, Pressure–Drop, Ergun's Equation, Fluidization Conditions, Weight of Solid, Intraparticle Forces, ‘Liquid–Like ‘Behavior, Incipience of Fluidization, Superficial Average Velocity
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file:///D|/Web%20Course/Dr.%20Nishith%20Verma/local%20server/fluid_mechanics/lecture33/33_1.htm[5/9/2012 3:40:34 PM]
Module 9: Packed beds
Lecture 33: Minimum fluidization velocity
Minimum fluidization velocity
Objectives_template
file:///D|/Web%20Course/Dr.%20Nishith%20Verma/local%20server/fluid_mechanics/lecture33/33_2.htm[5/9/2012 3:40:34 PM]
Module 9: Packed beds
Lecture 33: Minimum fluidization velocity
Minimum fluidization velocity
The minimum fluidization velocity can be calculated by equating the pressure–drop across the fixed
packed–bed, calculated from Ergun's equation to that from the expression for fluidized bed under
particulate (smooth) conditions.
Let us calculate the pressure-drop from the 2nd expression:
Under fluidization conditions, pressure–drop equals effective weight of solid, as intraparticle forces
disappear and solids float in the bed exhibiting ‘liquid–like ‘behavior. For a fluidized bed of length of
L and bed-porosity of ,
Weight of solid-particles–buoyancy
Or
, etc.
where
R-call:
(Fig. 33a)
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