Wang, Ziming; Mazzei, Luca; (2025) A new method for estimating the globally averaged mass transfer coefficient in liquid-particle agitated vessels. Chemical Engineering Journal , 523 , Article 168162. 10.1016/j.cej.2025.168162.

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Abstract

This work focuses on estimating the globally averaged mass transfer coefficient in liquid-particle agitated vessels. After discussing how this coefficient is defined and calculated, we review the main methods for deriving its correlations, namely the dimensional analysis, steady-state theory, unsteady-state theory, and Kolmogorov theory methods. These rely on simplifying assumptions that limit their accuracy, such as the possibility of neglecting the effects of particle interactions and free-stream turbulence on mass transfer. To overcome these limitations, we propose a new method that obtains the global mass transfer coefficient by averaging the local mass transfer coefficient over the entire fluid domain. To determine the local mass transfer coefficient field, we adopt a new model that accounts for the combined effects of fluid-particle slip velocity, particle interactions and free-stream turbulence on mass transfer. The fields of the required fluid dynamic variables are obtained using a validated turbulent multifluid model. The proposed approach is validated against selected experimental datasets covering a wide range of operating conditions. Compared to existing methods, our method yields significantly improved accuracy, with relative errors below 30% for most cases.

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