Écoulements diphasiques aux petites échelles – Application au refroidissement d’une Pile à Combustible (PEMFC)

Abstract : This study is devoted to boiling flows in mini-channels of small dimensions (hydraulic diameter between 0.727 mm and 1.45 mm). The objective was the enhancement of the thermal performance of PEM fuel cells. In our study, Forane 365 HX was selected to be used as the working fluid for the purpose of cooling. In comparison with single-phase flows, an important amount of energy can be extracted in forced boiling conditions while keeping a moderate wall temperature gradient. We especially studied the influence of the aspect ratio and hydraulic diameter We found that the heat flux necessary to the onset of nucleate boiling or the critical heat flux are dependent on the geometric dimensions of the mini-channel in our experiments. For the saturated boiling flow conditions, the pressure drop is also related to the channel cross-section area whereas the heat transfer coefficients seem to be nearly independent of the mini-channels.
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Ulrich Soupremanien. Écoulements diphasiques aux petites échelles – Application au refroidissement d’une Pile à Combustible (PEMFC). Mécanique des fluides [physics.class-ph]. Grenoble INP, 2010. Français. ⟨NNT : 2010INPG0150⟩. ⟨tel-01090384⟩

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