Ali, M, Mahmud, T orcid.org/0000-0002-6502-907X, Heggs, PJ orcid.org/0000-0003-3209-6521 et al. (4 more authors) (2017) CFD modelling of a pilot-scale counter-current spray drying tower for the manufacture of detergent powder. Drying Technology, 35 (3). pp. 281-299. ISSN 0737-3937
Abstract
A steady-state, three-dimensional, multiphase CFD modelling of a pilot-plant counter-current spray drying tower is carried out to study the drying behavior of detergent slurry droplets. The software package ANSYS Fluent is employed to solve the heat, mass and momentum transfer between the hot gas and the polydispersed droplets/particles using the Eulerian-Lagrangian approach. The continuous phase turbulence is modelled using the differential Reynolds stress model. The drying kinetics is modelled using a single droplet drying model[1] which is incorporated into the CFD code using user-defined functions. Heat loss from the insulated tower wall to the surrounding is modelled by considering thermal resistances due to deposits on the inside surface, wall, insulation and outside convective film. For the particle-wall interaction, the restitution coefficient is specified as a constant value as well as a function of particle moisture content. It is found that the variation in the value of restitution coefficient with moisture causes significant changes in the velocity, temperature and moisture profiles of the gas as well as the particles. Overall, a reasonably good agreement is obtained between the measured and predicted powder temperature, moisture content and gas temperature at the bottom and top outlets of the tower; considering the complexity of the spray drying process, simplifying assumptions made in both the CFD and droplet drying models and the errors associated with the measurements.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Drying Technology on 30 March 2016, available online: http://www.tandfonline.com/10.1080/07373937.2016.1163576. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Counter-current spray drying, heat and mass transfer, multiphase CFD modelling, spray drying kinetics |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Funding Information: | Funder Grant number Innovate UK fka Technology Strategy Board (TSB) TSB101332 |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 May 2016 08:41 |
Last Modified: | 15 Apr 2021 12:44 |
Published Version: | https://doi.org/10.1080/07373937.2016.1163576 |
Status: | Published |
Publisher: | Taylor & Francis |
Identification Number: | 10.1080/07373937.2016.1163576 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99393 |