Experimental study of a two phase flow in a bubble column

Educational objectives


The objective of this lab is to study experimentally a bubble column. A bubble column is a vertical cylindrical vessel containing a liquid phase where a gaseous phase is injected into the bottom by a gas distributor. This gaseous phase rises through the liquid, and finally escapes through the upper free surface.

Despite their widespread use in cheùmical or biological industry, the modelling of such devices remains unsatisfactory due to the lack of reliable physical model describing the interactions between phases. As the void fraction of bubbles is high (up to 50%), these are opaque flows, and the standard optical used in fluid mechanics techniques (such as PIV PTV, etc…) are no longer useful at such regimes.

We will therefore use an alternative state-of-the-art technique: the optical probe. This device allows to obtain time resolved 1D time signals and to measure the void fraction and the bubbles size and velocity distributions. We will therefore be able to check the different models available in the literature and to explore the complexity of two-phase flows.

 

Prerequisite


This lab-course is well suited to M1 and M2 students having a background in Fluid mechanics.

Module 1: single spherical bubble in a still fluid


4hrs session

Teacher: Martin Obligado

Module 2: bubble column


4 hrs session

Teacher: Martin Obligado

Contacts


Martin Obligado

LEGI

Location


This lab-course is hosted in the Galilée Building on the "industrial processes platform" located at 1270 rue de la piscine on the campus

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