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This paper describes a 9-stage Knudsen pump with planar architecture that uses nanoporous ceramic for thermal transpiration. While operating at 55 K above room temperature, the pump provides a maximum pressure head exceeding 12 kPa at a sealed outlet, or a gas flow rate of ap3.8 muL/min. against a pressure head of 160 Pa. Experiments also demonstrate the capability of the pump to steer water droplets...
This paper presents a comparative study of performance of various analytical and semi-analytical models used for the analysis of rarefied gas flow, which is responsible for the phenomenon of thermal transpiration. In particular, these are evaluated in the context of the scaling analysis of a Si-micromachined monolithic Knudsen pump. Results from these models are verified using available experimental...
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