A consistent dimensional analysis of gas-liquid mass transfer in an aerated stirred tank containing purely viscous fluids with shear-thinning properties

作者：Hassan Raouf; Loubiere Karine^*; Legrand Jack; Delaplace Guillaume

来源：Chemical Engineering Journal, 2012, 184: 42-56.

DOI：10.1016/j.cej.2011.12.066

• Dimensional analysis
• Variable material property
• Gas-liquid mass transfer
• Shear-thinning fluids
• Aerated stirred tank
• Model of Williamson-Cross

This paper deals with gas-liquid mass transfer in an aerated stirred tank containing Newtonian or shear-thinning fluids. The aim is to demonstrate that, for a given mixing system, an unique dimensionless correlation gathering all the mass transfer rates (150 k(l)a measurements) can be obtained if and only if the variability of the rheological material parameters is correctly considered when implementing the theory of similarity. More particularly, it is clearly illustrated that a too gross simplification in the relevant list of the parameters characterizing the dependence of apparent viscosity with shear rates leads to pitfalls when building the pi-space set. This is then a striking example showing that a robust predictive correlation can be established when the non-constancy of fluid physical properties ceases to be neglected.

• 出版日期2012-3-1