Ex.3 Fluidization



  1. To observe and study the behavior of bed during fluidization.
  2. To verify relationship between velocity of the fluid and pressure drop per unit length of packing.
  3. To verify Ergun’s Equation.

 Experiment Setup:-

The experiment setup consists of a glass column of 40 mm internal diameter and 500 mm length. Pressure tappings are provided at the bottom and top of the column to measure the pressure drop. Fluidizations Medium-water is supplied with the help of 0.5HP mono block pump through the supply valve. Water flow rate through the column can be controlled by the bypass and supply control valve. Two Monometers are provided to measure the pressure drop across the column.

Water is supplied by a pump tank and is collected in a measuring tank. Measuring tank is provided with a valve at the bottom which remains open except for the rate to measure the flow rate of water through the column.

The entire setup is made up of MS framework.


  1. Start with minimum flow rate, increasing it little at a time.
  2. For each flow rate, record the flow rate and manometer readings and make a visual observation of the bed.
  3. Stop increasing the flow rate of water when the bed just starts expanding.


  1. Inside diameter of the column = _______m
  2. Cross sectional area of the column= _______m2
  3. Length of the column (L)=_____ m
  4. Density of the fluid (ρf) = _____kg/m3
  5. Viscosity of the fluid (µf) = _____kg/m s.
  6. Solids used = glass beads
  7. Height of Packing= _____ m
  8. Mass of solids (m) = _____ kg
  9. Density of solids (ρs) = _____kg/m3
  10. Particle diameter (Dp) =_____ m (avg. diameter)
  11. Void fraction (ε) =_____

Observation Table :-



Height of the bed (H)


Flow rate of water

(Q) m2/sec


Velocity of Water

(VS) (m/sec)

Pressure drop across the column




Calculations and Plots:

  • Calculate for each run ΔP/L= Δd*g*(ρmercury— ρwater)
  • Plot (ΔP/L ρ) (ε2/1- ε ) (Dp/VS) Vs Re
  • Calculate f using above expression and compare the calculated values of f with experimental values.





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