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EvaluatingWater Vapor Permeance Measurement Techniques for Highly Permeable Membranes

Bui Duc Thuan1,2, Wong Yonghui2, Chua Kian Jon2, Ng Kim Choon2
Corresponding author E-mail: mpebuid@nus.edu.sg/buiducthuan@gmail.com
National University of Singapore, Department of Mechanical Engineering, 9 Engineering Drive 1,Singapore 117575, Singapore

Computers, Materials & Continua 2015, 47(2), 89-105. https://doi.org/10.3970/cmc.2015.047.089

Abstract

The cup method and dynamic moisture permeation cell (DMPC) method are two common techniques used to determine the water vapor permeation properties of a membrane. Often, ignoring the resistance of boundary air layers to the transport of water vapor results in the water vapor permeance of the membrane being underestimated in practical tests. The measurement errors are higher with highly permeable membranes. In this study, the two methods were simulated using COMSOL Multiphysics platform and the extent of the error was evaluated. Initial results showed that the error is equally high in both methods. With the correction for the still air gap, the cup method produces a relatively reduced error. In the DMPC method, reducing the error caused by the boundary air layer by increasing the sweep speed can produce higher instrument error. Highly accurate and precise instrument is needed for DMPC method; however, its error is still higher than that in the cup method. Simulations also show that lowering the test pressure is favorable to both methods.

Keywords

cup method simulation, dynamic moisture permeation cell method simulation, water vapor permeability

Cite This Article

B. D. . Thuan, W. . Yonghui, C. K. . Jon and N. K. . Choon, "Evaluatingwater vapor permeance measurement techniques for highly permeable membranes," Computers, Materials & Continua, vol. 47, no.2, pp. 89–105, 2015.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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