EXPERIMENT
AGITATION
VESSEL SET-UP
1. OBJECTIVE
To study the mixing
behaviour and power consumption of a mixture in an agitated vessels.
2. INTRODUCTION
Agitation or mixing is one of the oldest and
most common operations in chemical engineering. Although the effectiveness and
energy consumption in agitation depend upon basic principles of fluids
mechanics, the flow patterns in the typical agitated vessel are so complex that
rigorous application of the basic principles is impossible. Instead, empirical
approaches must be used.
Agitation is used in
various applications –
1)
Blending of two miscible liquids.
2)
Dispersion of a miscible solute throughout
a solvent.
3)
Production of a slurry of a finely divided
solid in a liquid.
4)
Mixing of reactants in a chemical reactor.
5)
Stirring of a homogeneous liquid to improve
heat transfer to the liquid
Npo=f*(Re)
FOR UN BAFFLED TANK
Npo =f*(Re)*(Nfr)
Nfr= (Forces associated with kinetic energy) / (forces associated with
gravity)
3.
PROCEDURE-
- First close all the brass forced ball valves and valves 2 (see in the diagram).Brass forced ball valves is used for measuring different levels of concentration.
- We have to calculate the power consumption with baffles and without baffles so first insert baffles in the agitation tank.
- Now add water in the agitation tank where flat blades impeller is used.
- See vortex is forming or not
- Now switch on the motor.
- Agitation Meter will give us the power consumption, speed
- Note down the speed, power consumption
- Now remove water through valve 2 then remove baffles.
- Now we have to calculate the power consumption, speed without inserting the baffles.
- We follow the same procedure as we followed in the case of with Baffles.
- Add water, see vortex is forming or not.
- Switch on the motor. Note down all the consumption and speed.
