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WL 225 Fluidisation and Heat Transfer
Education / GUNT Hamburg / Thermal Engineering and HVAC / Applied Thermodynamics /

A fluidised bed is formed when a mass of particles is suspended by passing gas through them. The thermodynamic and fluid mechanical properties of the solid take on the character of a fluid.

  The heat transfer from a heated cylinder to the fluidised bed can be investigated using the experimental unit. The glass measuring cylinder with background lighting enables the fluid bed and the fluidisation process to be very clearly observed. A heating element that can be lowered into the reactor enables the transfer of heat in the fluidised bed to be investigated. Temperatures are measured with sensors at the air inlet of the reactor, at the surface of the heating element and in the fluidised bed. A safety valve limits the reactor pressure.

Learning Objectives / Experiments
- Effect of particle size on fluidisation
- Fluid permeability of fixed and fluidised beds
- Heat transfer in a fluidised bed
  * influence of the amount of air
  * influence of the position of the heater
  * influence of the particle size
- Observation of the fluidisation process
- Pressure curve within the bed
- Determination of the loosening velocity
- Observation of the sedimentation processes

[1] Transfer of heat in a fluidised bed
[2] Glass reactor, illuminated from the rear
[3] Fluidised bed made of corundum, particle size either 100µm or 250µm
[4] Adjustable heating element 
[5] Temperature sensors at heater, air inlet, in fluidised bed
[6] Airflow rate measurement with rotameter
[7] Safety valve, temperature cut-out at heater, air filter at inlet and outlet 

Technical Data

Glass reactor

- capacity: 2,15L

- max. air requirement: 300L/h

- filling volume: approx. 1L

- operating pressure: 0,5bar 


- power: 0...100W

- surface: approx. 10cm²

Measuring ranges
- temperature air inlet: 0...100°C
- temperature heater / fluidised bed: 0...400°C
- airflow rate (rotameter): 10...124 standard L/min
- pressure in fluidisd bed: 0...25mbar
- power: 0...200W
- 2 manometers: 0...1,6bar


Dimensions and Weight
LxWxH: 900x455x820mm
Weight: approx. 75kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Compressed air connection: min. 2bar
Scope of Delivery

1 experimental unit

2 bags of particles

1 manual

Order Details
060.22500  WL 225  Fluidisation and Heat Transfer