Research Repository

A non-invasive study of flow dynamics in membrane distillation hollow fiber modules using low-field nuclear magnetic resonance imaging (MRI)

Yang, Xing, Fridjonsson, E. O, Johns, M. L, Wang, R and Fane, Anthony G (2014) A non-invasive study of flow dynamics in membrane distillation hollow fiber modules using low-field nuclear magnetic resonance imaging (MRI). Journal of Membrane Science, 451. pp. 46-54. ISSN 0376-7388

[img]
Preview
Text
2013_A non-invasive study of flow dynamics in MD modules_manuscript_Jan13.pdf - Accepted Version

Download (780kB) | Preview

Abstract

Low-field bench-top nuclear magnetic resonance imaging (MRI) has been applied to investigate the hydrodynamics in novel hollow fiber modules with four different configurations of randomly-packed, spacer-knitted, curly and semi-curly fibers, specifically designed for the membrane distillation (MD) process. Imaging, spatially resolved velocity maps and propagators (probability distributions of displacement/velocity) were all acquired in the modules with flow in the shell side. The MRI data were correlated with overall module performance. The results have revealed that the curly configuration exhibited more significant transverse flow and hence enhanced mixing, compared to the randomly packed configuration; this was consistent with an enhanced MD performance in terms of permeation flux. Interestingly, the velocity maps of the spacer-knitted fiber design indicated a significant flow channeling in the center of the module, despite its enhanced MD performance. Fortunately, combined with further investigations on the localized velocity images of this configuration, the acquisition of propagators provided valuable information in revealing the existence of reduced stagnant regions and significant transverse flow at varied operating conditions, which indicated a better overall mixing and hence confirmed its module performance.

Item Type: Article
Uncontrolled Keywords: hollow fibers module, membrane distillation, magnetic resonance imaging, hydrodynamics, propagators
Subjects: Current > FOR Classification > 0904 Chemical Engineering
Historical > Faculty/School/Research Centre/Department > Institute for Sustainability and Innovation (ISI)
Depositing User: Ms Julie Gardner
Date Deposited: 18 Jun 2014 02:17
Last Modified: 26 Jun 2018 05:57
URI: http://vuir.vu.edu.au/id/eprint/25285
DOI: https://doi.org/10.1016/j.memsci.2013.09.015
ePrint Statistics: View download statistics for this item
Citations in Scopus: 21 - View on Scopus

Repository staff only

View Item View Item

Search Google Scholar