2019
DOI: 10.2514/1.t5659
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Measurement of Variation of Momentum Accommodation Coefficients with Molecular Mass and Structure

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Cited by 10 publications
(9 citation statements)
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“…For all the cases considered in the present work, decreasing the tangential accommodation coefficient weakens the interactions between the gas molecules and the channel walls, leading to an increase in the gas velocity. A similar behaviour has also been observed both experimentally and numerically for rarefied gas flows in microchannels with uniform cross-sections [37,50,51,69]. As expected, the augmentation of gas velocity in the channel results in an increase in the kinetic energy and a decrease in internal energy and thus the gas temperature.…”
Section: Resultssupporting
confidence: 82%
See 1 more Smart Citation
“…For all the cases considered in the present work, decreasing the tangential accommodation coefficient weakens the interactions between the gas molecules and the channel walls, leading to an increase in the gas velocity. A similar behaviour has also been observed both experimentally and numerically for rarefied gas flows in microchannels with uniform cross-sections [37,50,51,69]. As expected, the augmentation of gas velocity in the channel results in an increase in the kinetic energy and a decrease in internal energy and thus the gas temperature.…”
Section: Resultssupporting
confidence: 82%
“…The effects of tangential momentum accommodation coefficient (α) on thermal and fluid flow fields were also studied in the present work. The tangential momentum accommodation coefficient ranges between zero (specular reflection) and one (fully-diffused reflections) depending on the internal gas molecule structure, the molecular mass of the gas, and the surface material [50,51].…”
Section: Problem Descriptionmentioning
confidence: 99%
“…For all the cases considered in the present work, decreasing the tangential accommodation coefficient weakens the interactions between the gas molecules and the channel walls, leading to an increase in the gas velocity. A similar behaviour has also been observed both experimentally and numerically for rarefied gas flows in microchannels with uniform cross-sections [37,51,50,70]. As expected, the augmentation of gas velocity in the channel results in an increase in the kinetic energy and a decrease in internal energy and thus the gas temperature.…”
Section: Model Validation and Verificationsupporting
confidence: 82%
“…The effects of tangential momentum accommodation coefficient (α) on thermal and fluid flow fields are also studied in the present work. The tangential momentum accommodation coefficient ranges between zero (specular reflection) and one (fully-diffused reflections) depending on internal gas molecule structure, the molecular mass of the gas, and surface material [50,51].…”
Section: Problem Descriptionmentioning
confidence: 99%
“…Two more parameters are the tangential momentum accommodation coefficients (TMAC) of the housing α h and the rotor α r . These parameters are dimensionless numbers 0 ≤ α ≤ 2 that describe the gas surface interaction in rarefied gases and depend on the wall material and the gas properties and can be obtained by measurements in the literature, see for example reference [12]. If the rotor is made of a different material than the housing (for example due to coating), different TMACs are needed for the certain walls in the model.…”
Section: Dimensional Analysismentioning
confidence: 99%