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THE JETSCAN

A new analytical method
of the foamability by shear and
of test of the efficiency and the persistence
of the antifoaming agents

 

The JETSCAN makes it possible to generate foam under high shear stresses of the liquid phase by recirculation. The foam generated by the jet rises in a glass tube. Experiments can be implemented up to 90°C.

The antifoaming agents are introduced in the jet, on top of the glass tube.

 

EXAMPLES OF APPLICATIONS

Sugar industry

Pulp and paper industry

Food industry

Detergency

 

PHYSICAL QUANTITIES MEASURED IN REAL TIME

The JETSCAN measures in real time :

      • the volume of the foam by image analysis,

      • the quantity of liquid in it,

and other relevant parameters of the foam.

 

A typical experimental protocol is described in the following figure.

Observations :

These two graphs show the comparison of the foam formation by shear (with a jet) or by bubbling. At the end of the foam formation by bubbling, a antifoam is introduced. During the stability of the foam, the foam volume control highlight of the efficiency and the persistence of the activity of the antifoam.

 

THE OPTIONS

The JETSCAN can be fully automated:

      • introduction of the liquid samples,

      • introduction of the antifoaming agents,

      • cleaning of the piping system.

1 - Light source

2 - CCD camera

3 - Cuvette (liquid)

4 - Glass tube

5 - Jet nozzle

6 - Introduction system of the antifoamers

7 - Recirculation piping system

8 - Introduction of the liquid sample and cleaning liquids

9 - Bleeding of the liquid sample and cleaning liquids

10 - Rinsing piping system

 

THE RESULTS

The following curves (foam volume and jet flow versus time) show the reproducibility of experiments :