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Gas injection in a yield stress fluid
Author(s) -
Hojeij Ali,
Jossic Laurent,
Magnin Albert,
Blésès Didier,
Hattou Stéphane
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16878
Subject(s) - mechanics , dimensionless quantity , mixing (physics) , yield (engineering) , viscosity , rheology , newtonian fluid , materials science , secondary air injection , non newtonian fluid , jet (fluid) , flow (mathematics) , stress (linguistics) , inertia , volumetric flow rate , thermodynamics , chemistry , composite material , classical mechanics , physics , linguistics , philosophy , quantum mechanics
Mixing of viscous non‐Newtonian fluids plays an important role in many industrial processes (wastewater treatment, methanization, etc.). In some cases, mixing by gas injection can be more interesting than mechanical mixing. The present study focuses on the gas injection in yield stress fluids. The influence of the air flow rate, fluid rheological properties, and geometrical configuration on an air jet impinging the bottom wall of a tank containing a yield stress fluid has been considered. Focus has been placed on the air cavity present at the injection point. The trends of two key parameters of the cavity have been characterized: its maximum diameter and frequency detachment. Correlations based on the characteristic dimensionless numbers governing the flow have been derived. These correlations show that the apparent viscosity has an effect on the cavity's frequency but a low influence on its diameter which is mainly governed by the air flow inertia.