Effects of a rotating magnetic field on gas-liquid mass transfer coefficient

The mass transfer coefficient k(L) is a key parameter for an aeration mixing design and optimization. From the practical point of view, the volume-related liquid side mass transfer coefficient (k(L)a) is commonly applied in the gas-liquid contacting devices. This parameter is affected by several factors such as geometrical and operational characteristics of the vessel, media composition and microorganisms. Moreover, the rate of the mass transfer between two phases depends on the physicochemical properties of the mixed system, the interface surface and the hydrodynamic conditions of the process. The present study aim at: (i) analyzing the influence of the rotating magnetic field (RMF) on the aeration process of various types of liquids and (ii) quantifying the obtained liquid volumetric mass transfer coefficients (kLa) by using the new type of relationships. To quantify the impact of RMF on the hydrodynamic conditions, modelling using various correlations issued from the theoretical considerations was performed. The results shown that the hydrodynamic parameters analyzed depend mainly on the applied RMF magnetic induction and the composition of the liquid subjected to exposure. (C) 2017 Elsevier B.V. All rights reserved.