Diffusive-to-ballistic transition of the modulated heat transport in a rarefied air chamber

Diffusive-to-ballistic transition of the modulated heat transport in a rarefied air chamber

Modulated heat transfer in air subject to pressures from 760 Torr to 10-4 Torr is experimentally studied by means of a thermal-wave resonant cavity placed in a vacuum chamber. This is done through the analysis of the amplitude and phase delay of the photothermal signal as a function of the cavity le...

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Veröffentlicht in:AIP advances 2017-01, Vol.7 (1), p.015032-015032-8
Hauptverfasser: Gomez-Heredia, C. L., Macias, J., Ordonez-Miranda, J., Ares, O., Alvarado-Gil, J. J.
Format: Artikel
Sprache:eng
Schlagworte:
Air chambers
Amplitudes
Concavity
Molecular dynamics
Transport
Vacuum chambers
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Zusammenfassung:Modulated heat transfer in air subject to pressures from 760 Torr to 10-4 Torr is experimentally studied by means of a thermal-wave resonant cavity placed in a vacuum chamber. This is done through the analysis of the amplitude and phase delay of the photothermal signal as a function of the cavity length and pressure through of the Knudsen’s number. The viscous, transitional, and free molecular regimes of heat transport are observed for pressures P>1.5 Torr, 25 mTorr
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4972123