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Title: A parametric study of spray drying of a solution in a pulsating high-temperature turbulent flow
Authors: Wu, Z. 
Mujumdar, A.S. 
Keywords: CFD
Heat and mass transfer
Numerical modeling
Particle trajectories
Pulse combustion
Spray drying
Turbulence models
Two-phase flow
Issue Date: 2006
Citation: Wu, Z., Mujumdar, A.S. (2006). A parametric study of spray drying of a solution in a pulsating high-temperature turbulent flow. Drying Technology 24 (6) : 751-761. ScholarBank@NUS Repository.
Abstract: Spray drying of a concentrated common salt (NaCl) solution carried out in the intense oscillating high-temperature turbulent flow field generated in the tailpipe of a pulse combustor was simulated. Simulation of such transport process problems is especially crucial since the environmental conditions are too hostile for detailed and reliable measurements. The momentum, heat, and mass transfer processes between the gas and droplet phases during drying were simulated using a computational fluid dynamic solver. The simulated profiles of flow field, temperature, and humidity of gaseous phase, and particle trajectories in a drying chamber are presented and discussed. The effects of gas temperature, pulse frequency and amplitude, and gas mass flow rate on the transient flow patterns, droplet trajectories, and overall dryer performance were investigated. Different turbulence models were also tested. Simulation results show that the flow field and droplet drying conditions vary widely during a single pulsating period. Very short drying times and very high drying rate characterize pulse combustion spray drying. Thus, pulse combustion drying can be applied to drying of fine droplets of highly heat-sensitive materials although the jet temperature initially is extremely high. Copyright © 2006 Taylor & Francis Group, LLC.
Source Title: Drying Technology
ISSN: 07373937
DOI: 10.1080/03602550600685267
Appears in Collections:Staff Publications

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