the static mixer section with air. It is located immediately upstream
the first element of static mixer. Its specific geometry ensures
that the gas is well dispersed all around the pipe diameter:
the gas is introduced in the liquid by an annular dispenser with
12 tubular holes symmetrically located around the section. The
injection holes are 0.5 mm in diameter for SMX10 and 0.3 mm in
diameter for SMX+6.
The experimental loop includes a screw pump (Lenze™) to feed
the static mixer with the liquid, as well as a liquid flow-meter and
a gas mass flow-meter (Proline Promag 50 and Promass 80 from
Endress + Hausser™). Two pressure sensors, Ceraphant T and Deltabar
S (Endress + Hausser™), with adjusted measuring range until
3 bars, are located at the gas inlet and at the bounds of the static
mixer to measure the pressure drop across the mixer. Thermocouples
(Type K, Omega) are used to record the temperatures of
liquid and foam.