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Cooling of PEMFC with pentane boiling in minichannels: A study of flow instabilities using neutron radiography visualization
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.
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2006 (English)In: 16th World Hydrogen Energy Conference 2006, 2006, 2885-2894 p.Conference paper (Refereed)
Abstract [en]

Compared to other heat transfer systems, Polymer Electrolyte Fuel Cells are characterized by very low heat flux. In order to analyse two-phase pentane cooling of bipolar plates, high speed neutron visualizations have been performed in a circular steel tube (Di=1.1 mm, Do=2 mm) at the Institut Laue-Langevin in Grenoble, France. The flow pattern is clearly visible and can be synchronized with time resolved temperature measurements. At low mass flow rates, the pipe wall is high above the saturation temperature and the pipe filled with vapour and liquid slugs. At higher flow rates, the wall is superheated when filled with liquid and at saturation temperature when exposed to a liquid-vapour mixture. An irregular switching between these two states was observed. Superheated liquid exists in both stable and time dependent states. The ?-radiation produced by the neutrons is shown to have an important effect on the boiling process. Simplified steady and time dependent models are proposed to explain the measured wall temperature instabilities and superheat.

Place, publisher, year, edition, pages
2006. 2885-2894 p.
, 16th World Hydrogen Energy Conference 2006, WHEC 2006, 4
Keyword [en]
Cooling, Fuel cell, Minichannel, Neutron radiography, Two-phase, Heat transfer systems, Mini channels, Polymer electrolyte fuel cells, Saturation temperature, Time resolved temperature, Time-dependent models, Time-dependent state, Flow rate, Fuel cells, Heat flux, Hydrogen, Paraffins, Phase transitions, Proton exchange membrane fuel cells (PEMFC), Temperature measurement, Vapors, Visualization, Liquids
National Category
Other Mechanical Engineering
URN: urn:nbn:se:kth:diva-155005ScopusID: 2-s2.0-84875578132ISBN: 9781622765409OAI: diva2:761260
16th World Hydrogen Energy Conference 2006, WHEC 2006, 13 June 2006 through 16 June 2006, Lyon

QC 20141106

Available from: 2014-11-06 Created: 2014-10-29 Last updated: 2014-11-06Bibliographically approved

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Lundell, Fredrik
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