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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.

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Cite This Article

APA Style
Thuan, B.D., Yonghui, W., Jon, C.K., Choon, N.K. (2015). Evaluatingwater vapor permeance measurement techniques for highly permeable membranes. Computers, Materials & Continua, 47(2), 89-105. https://doi.org/10.3970/cmc.2015.047.089
Vancouver Style
Thuan BD, Yonghui W, Jon CK, Choon NK. Evaluatingwater vapor permeance measurement techniques for highly permeable membranes. Comput Mater Contin. 2015;47(2):89-105 https://doi.org/10.3970/cmc.2015.047.089
IEEE Style
B.D. Thuan, W. Yonghui, C.K. Jon, and N.K. Choon "EvaluatingWater Vapor Permeance Measurement Techniques for Highly Permeable Membranes," Comput. Mater. Contin., vol. 47, no. 2, pp. 89-105. 2015. https://doi.org/10.3970/cmc.2015.047.089



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