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Basic tasks of mixing

 

 

 

Homogenising

HomogenisierenMixing liquids which are soluble in each other to balance differences of concentration and temperature. The liquids which are to be mixed may vary in concentration, colour or temperature.

 
Suitable stirring rotors:
Nieder-bis mittelviskos   Mittel-bis hochviskos
     



Heat exchange

Wärmetausch To intensify the heat exchange in stirring vessels especially with viscous liquids. Transfer of liquid to and away from the heat exchanger (e.g. heating jacket) by means of suitable flows.

 
Suitable stirring rotors:
Nieder-bis mittelviskos   Mittel-bis hochviskos
     



Gas injection

Grundaufgaben der Rührtechnik BegasenThe purpose of treating a liquid with gas is to increase the phase boundary between liquid and gas that can, for example, shorten chemical reaction times. The stirring rotor needs to divide the gas flow into small bubbles and distribute them evenly in the liquid.

 
Suitable stirring rotors::



Dispersing

Grundaufgaben der Rührtechnik Despergieren Dispersing describes the mixture of two compounds which are not or hardly soluble in each other, e.g. to intensify the exchange of components. Dispersions (heterogeneous mixture) are instable and segregate without energy supply.

 
Suitable stirring rotors:


Suspending

Grundaufgaben der Rührtechnik Suspendieren web kleinSuspending distributes or disperses solid particles homogeneously throughout the liquid. The stirrer shall prevent sedimentation of the solid particles.

 
Suitable stirring rotors:



Viscosity and flow characteristic-
One of the most important parameters for the mixing technology

This applies to both the selection of a suitable stirring rotor and required performance of the stirrer drive. Viscosity describes the thickness or fluidity of liquids and/or fluids. In viscous liquids particles are bound together more strongly and thus less movable which is referred to as internal friction.

Dynamic viscosity is measured in pascal seconds (Pa·s) or millipascal seconds (mPa·s) (obsolete expression poise ‘P’ or centipoise ‘cP’).

Kinematic viscosity is expressed in m²/s. It describes the inner friction of a liquid and is calculated by dividing the dynamic viscosity by the density of a liquid.

Dynamic viscosity of common substances in comparison at 20°C and normal pressure:Grundaufgaben der Rührtechnik Viskosität
 
Millipascal second mPa·s (centipoise cP)
Example
0.3 acetone
1 water
2 milk
80 olive oil
200 maple syrup
3.000 honey
5.000 to 10.000 molasses
50.000 to 70.000 ketchup
150.000 to 250.000 tomato puree

 

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