Method for determination of mass transfer coefficients for dissolution of dense ceramics in liquid slags. (1st May 2022)

• Record Type: Journal Article
• Authors: Guarco, Jerónimo; Harmuth, Harald; Vollmann, Sandra
• Is Part Of: International journal of heat and mass transfer. Volume 186(2022)
• Publication Date: 2022-05-01
• Subjects: CFD -- ACFD -- Mass transfer -- Dissolution -- Large Schmidt systems; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2021.122494
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Mass transfer coefficients are found for dissolution of fine ceramics in liquid slag. Mass transfer coefficients are calculated without solving species transport equation. Proposed method is efficient and applicable in systems with large Schmidt numbers. Abstract: This paper presents a numerical method to determine the mass transfer coefficients in the dissolution of dense ceramics in liquid slags. Simulations are based on a typical rotating finger test as the experimental set-up, where a cylindrical sample is immersed in a slag bath and rotated with a constant angular speed. CFD simulations of the flow field are conducted using the volume of fluid method to incorporate both the slag and air phases. Owing to the very large Schmidt number of the arrangement and to avoid using extremely fine meshes, an asymptotic boundary layer approach is employed. This approach allows for the calculation of local, steady-state mass transfer coefficients along the sample in a postprocessing step without resorting to solving the species transport equation within the CFD calculations. The method is verified by comparing the results to those obtained via well-established equations. Resultant mass transfer coefficients are discussed with respect to values obtained from mass transfer equations in literature. The presented approach serves as an effective calculation method for the mass transfer coefficient and offers the opportunity to obtain the inverse calculation of diffusivities in systems where the Schmidt number reaches large values.