Experimental analysis of the separation efficiency of an orientation independent gas/liquid membrane separator

Abstract A membrane separator for orientation independent gas liquid separation in portable direct methanol fuel cell systems is presented in this paper. Its working principle is based on capillary forces using a combination of hydrophilic and hydrophobic materials with milli/micro structured channels. The efficiency of liquid recycling is studied experimentally with regard to the influence of system parameters and environmental parameters and to the separator’s orientation. In further experiments, the limits for a complete gas separation are detected with respect to the volume flow of the gas and the liquid phase. It is shown that the orientation has only a minor influence on the liquid recycling efficiency compared to other parameters. Significant for the loss of liquid in the separator is the temperature difference between the inlet of the gas liquid stream and the environment. Furthermore, geometry parameters affect the limitation for the separation efficiency as well as system parameters.

[1]  Sigurd Skogestad,et al.  Chemical and Energy Process Engineering , 2008 .

[2]  John Aurie Dean,et al.  Lange's Handbook of Chemistry , 1978 .

[3]  Joonwon Kim,et al.  A distributed gas breather for micro direct methanol fuel cell (/spl mu/-DMFC) , 2003, The Sixteenth Annual International Conference on Micro Electro Mechanical Systems, 2003. MEMS-03 Kyoto. IEEE.

[4]  N. Nguyen,et al.  Fundamentals and Applications of Microfluidics , 2002 .

[5]  Ulrike Krewer,et al.  Model-Based Analysis of the Feasibility Envelope for Autonomous Operation of a Portable Direct Methanol Fuel-Cell System , 2010 .

[6]  J. Drelich.  The Effect of Drop (Bubble) Size on Contact Angle at Solid Surfaces , 1997 .

[7]  G. Fedder,et al.  Micro-electro-mechanical systems (MEMS)-based micro-scale direct methanol fuel cell development , 2006 .

[8]  Ulrike Krewer,et al.  Modelling, dynamics and control of a portable DMFC system , 2010 .

[9]  Roger T. Howe,et al.  The effect of release-etch processing on surface microstructure stiction , 1992, Technical Digest IEEE Solid-State Sensor and Actuator Workshop.

[10]  Estrella Alvarez,et al.  Surface Tension of Alcohol Water + Water from 20 to 50 .degree.C , 1995 .

[11]  R. Zengerle,et al.  Self-regulating passive fuel supply for small direct methanol fuel cells operating in all orientations , 2009 .

[12]  Chang-Jin Kim,et al.  A degassing plate with hydrophobic bubble capture and distributed venting for microfluidic devices , 2006 .

[13]  C. Kim,et al.  An active micro-direct methanol fuel cell with self-circulation of fuel and built-in removal of CO2 bubbles , 2009 .

[14]  Ronald S. Fearing,et al.  Survey of sticking effects for micro parts handling , 1995, Proceedings 1995 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human Robot Interaction and Cooperative Robots.

[15]  K. Arnold,et al.  Dehydration of Glass Surfaces Studied by Contact Angle Measurements , 1996 .

[16]  Chih-Ming Ho,et al.  A Methanol-Tolerant Gas-Venting Microchannel for a Microdirect Methanol Fuel Cell , 2007, Journal of Microelectromechanical Systems.