Energy harvesting through gas dynamics in the free molecular flow regime between structured surfaces at different temperatures

Tobias Baier, Julia Dölger, Steffen Hardt

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Abstract

For a gas confined between surfaces held at different temperatures the velocity distribution shows a significant deviation from the Maxwell distribution when the mean free path of the molecules is comparable to or larger than the channel dimensions. If one of the surfaces is suitably structured, this nonequilibrium distribution can be exploited for momentum transfer in a tangential direction between the two surfaces. This opens up the possibility to extract work from the system which operates as a heat engine. Since both surfaces are held at constant temperatures, the mode of momentum transfer is different from the thermal creep flow that has gained more attention so far. This situation is studied in the limit of free-molecular flow for the case that an unstructured surface is allowed to move tangentially with respect to a structured surface. Parameter studies are conducted, and configurations with maximum thermodynamic efficiency are identified. Overall, it is shown that significant efficiencies can be obtained by tangential momentum transfer between structured surfaces.
Original languageEnglish
JournalPhysical Review E
Volume89
Issue number5
Pages (from-to)053003
Number of pages10
ISSN2470-0045
DOIs
Publication statusPublished - 2014

Bibliographical note

©2014 American Physical Society

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