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Etude de l'ébullition du pentane en monocanal en vue de son utilisation pour le refroidissement des piles à combustible PEMFC

Abstract : Fuel cells present an immense opportunity for cleaner power generation in many applications. To meet the demands of polymer electrolyte fuel cells in transportation applications, a new type of compact, durable, non-conducting and low-temperature cooling system must be developed. We chose two-phase forced pentane cooling as the most promising new system, and tested this method in an experimental set-up designed to replicate conditions in a fuel cell. The flow is laminar in 0.8 x 0.8 mm channels at low thermal flux. To determine if instabilities will pose a problem, we test the variation of flow with the inlet compressibility. The flow is studied using neutron visualization which permits the study of hydrogen rich fluids without modifying the thermal boundary conditions. 'The neutron visualizations show the presence of two metastable states: superheated liquid and stable boiling. The strong temperature fluctuations are correlated to the flow regime observed in the visualization. ILULIAQ was the final experimental setup and was designed during the thesis for careful insulation of both monocanal and plate tests. The error in the total heat injected into the channel is 0.1 W, while the total heat varies between land 5 W. The results show an initial superheated liquid followed by boiling with low instabilities uncorrelated to the inlet compressibility. Both the pressure drop and the heat transfer coefficient are sufficient for fuel cell cooling. Taken as an ensemble, these results indicate that boiling pentane in minichannels could be a promising method of cooling fuel cells while improving on the current technology. This work has been conducted at CEA-Grenoble.
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Kathryn Oseen-Senda. Etude de l'ébullition du pentane en monocanal en vue de son utilisation pour le refroidissement des piles à combustible PEMFC. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10176⟩. ⟨tel-01746517⟩



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