View in EDS

Modelling heat and mass transfer in batch, top-spray fluidised bed coating processes

Saved in:
Bibliographic Details
Title: Modelling heat and mass transfer in batch, top-spray fluidised bed coating processes
Authors: Ronsse, F.1 Frederik.Ronsse@UGent.be, Pieters, J.G.1, Dewettinck, K.2
Source: Powder Technology. Mar2009, Vol. 190 Issue 1/2, p170-175. 6p.
Subjects: Coating processes, Fluidized-bed combustion, Heat transfer, Mass transfer, Mathematical models, Simulation methods & models, Atomization
Abstract: Abstract: The objective of this study was the development of a new process model for the different heat and mass transfer phenomena during fluidised bed coating processes. The model is based on the discretisation of the bed into horizontal control volumes, in which the heat and mass balances for air, water vapour, droplets, particles and coating material were established. The simulation results were validated using experimental two-dimensional spatial air temperature and air humidity distributions which were measured in a fluidised bed pilot reactor using a scanning probe. A sensitivity analysis was carried out to study the effect of controllable process variables, such as fluidisation air and atomisation air properties, as well as the properties of the spraying liquid upon the simulated dynamic temperature and humidity distributions. Also, the effects of relevant process variables on growth rate uniformity and process yield were studied. Based on this sensitivity study, it was concluded that nozzle parameters are as important as the fluidisation air properties for coating growth rate uniformity and process yield. [Copyright &y& Elsevier]
Copyright of Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Abstract: The objective of this study was the development of a new process model for the different heat and mass transfer phenomena during fluidised bed coating processes. The model is based on the discretisation of the bed into horizontal control volumes, in which the heat and mass balances for air, water vapour, droplets, particles and coating material were established. The simulation results were validated using experimental two-dimensional spatial air temperature and air humidity distributions which were measured in a fluidised bed pilot reactor using a scanning probe. A sensitivity analysis was carried out to study the effect of controllable process variables, such as fluidisation air and atomisation air properties, as well as the properties of the spraying liquid upon the simulated dynamic temperature and humidity distributions. Also, the effects of relevant process variables on growth rate uniformity and process yield were studied. Based on this sensitivity study, it was concluded that nozzle parameters are as important as the fluidisation air properties for coating growth rate uniformity and process yield. [Copyright &y& Elsevier]
ISSN:00325910
DOI:10.1016/j.powtec.2008.04.048