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Effect of non-woven net spacer on a direct contact membrane distillation performance: experimental and theoretical studies

Title
Effect of non-woven net spacer on a direct contact membrane distillation performance: experimental and theoretical studies
Author
김영득
Keywords
Spacer; Temperature polarization; Heat and mass transfer; Flux improvement; Desalination
Issue Date
2018-10
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v. 564, Page. 193-203
Abstract
This study provides a comprehensive and systematic overview of the fundamental characteristics of heat and mass transfer in the direct contact membrane distillation (DCMD) process that employs different types of spacers on one or both surfaces of the membrane. Detailed theoretical investigations were carried out to demonstrate the effects of spacers adjacent to the membrane surface on heat and mass transfer enhancement in the DCMD with a PTFE/PP composite membrane, complemented with experimental data for model validation. Thus, this work aimed to propose and demonstrate the heat transfer correlation for spacer-filled channels to reliably predict the heat and mass transfer improvement by non-woven net spacers in the DCMD process. The results showed that the permeate flux enhancement by the spacers ranged between 7% and 19% only for the spacer-filled permeate channels and between 21% and 33% only for the spacer-filled feed channels even at higher flow rates, thus indicating lower flux enhancements in the spacer-filled permeate channels. This was because the influence of spacers on flux improvement became more evident at higher temperatures owing to higher temperature polarization. In this study, the maximum flux enhancement of approximately 43% over the empty channels was achieved using the thinnest and densest spacer with a hydrodynamic angle of 90 degrees, adjacent to both membrane surfaces.
URI
https://www.sciencedirect.com/science/article/pii/S0376738818313449https://repository.hanyang.ac.kr/handle/20.500.11754/81423
ISSN
0376-7388
DOI
10.1016/j.memsci.2018.07.019
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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