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The applicability of capillary separation to direct methanol fuel-cell systems is studied in this article from two complementary perspectives: a three-dimensional
simulation with computational fluid dynamics of a gas-liquid separator, whose function is based on capillary forces rather than gravity, and a zero-dimensional
model, which is integrated in the process model of a direct methanol fuel-cell system. The three-dimensional analysis indicates that an appropriate choice of construction and operation parameters allows to achieve almost perfect liquidgas separation, and that operation is not signicantly in uenced by orientation. The system-wide analysis indicates that the inclusion of such a capillary separator
stabilises the system, allowing the use of simpler control strategies and removing the necessity of sensors dicult to implement.
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