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Article Dans Une Revue International Journal of Heat and Mass Transfer Année : 2016

Analysis of flow induced by temperature fields in ratchet-like microchannels by Direct Simulation Monte Carlo

Jie Chen
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Stefan K Stefanov
Lucien Baldas
Stéphane Colin

Résumé

This paper presents a numerical analysis of a novel configuration of Knudsen pump for rarefied gas flow. The pumping element consists of two facing isothermal ratchet surfaces at different temperatures. The asymmetric saw-tooth-like surfaces in optimal geometrical conditions can create temperature inequalities in the near wall region and finally engender a macroscopic flow. The rarefied gas flow is numerically investigated by Direct Simulation Monte Carlo (DSMC) in the slip and transition regimes. A parametric study reveals the effects of several crucial parameters including temperature difference, Knudsen number, accommodation coefficients as well as main geometrical parameters. In particular, the results indicate that the mass flow rate reaches a maximum value for a Knudsen number around 0.1 and becomes negative for a Knudsen number close to unity.
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Dates et versions

hal-01877853 , version 1 (20-09-2018)
hal-01877853 , version 2 (05-04-2019)

Licence

Paternité - Pas d'utilisation commerciale

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Citer

Jie Chen, Stefan K Stefanov, Lucien Baldas, Stéphane Colin. Analysis of flow induced by temperature fields in ratchet-like microchannels by Direct Simulation Monte Carlo. International Journal of Heat and Mass Transfer, 2016, 99, pp.672-680. ⟨10.1016/j.ijheatmasstransfer.2016.04.023⟩. ⟨hal-01877853v2⟩
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