Tangential momemtum accommodation in microtube

Ewart, Timothée; Perrier, Pierre; Graur, Irina; Méolans, J. Gilbert

doi:10.1007/s10404-007-0158-3

Cited by 88 publications

(58 citation statements)

References 13 publications

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“…3. Our results do not show a clear correlation between the TMAC and the molecular mass of the gas, as reported in some studies, [21][22][23] and disputed by others. 20, 34 4.…”

Section: Discussioncontrasting

confidence: 88%

“…In flow rate measurements utilizing micro-tubes, [21][22][23] an inverse dependence of α on the molecular mass (proportional to m m ) has been observed. This dependence has been disputed in Refs.…”

Section: B Slip and Accommodation Coefficientsmentioning

confidence: 95%

“…The first one focuses on measurements of flow rates in micro-channels (see, for example, Refs. [20][21][22][23][24][25]. Several theoretical approaches are being applied to derive slip and accommodation coefficients from the experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic force measurements under precisely controlled conditions: Correlation of slip parameters with the mean free path

et al. 2013

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A customized atomic force microscope has been utilized in dynamic mode to measure hydrodynamic forces between a sphere and a flat plate, both coated with gold. In order to study the influence of the mean free path on slippage without systematic errors due to varying surface properties, all data have been acquired at precisely the same spot on the plate. Local accommodation coefficients and slip lengths have been extracted from experimental data for He, Ne, Ar, Kr, as well as N2, CO2, and C2H6, at Knudsen numbers between 3 × 10−4 and 3. We found that slippage is effectively suppressed if the mean free path of the fluid is lower than the roughness amplitude on the surface, while we could not observe a clear correlation between the accommodation coefficient and the molecular mass.

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“…3. Our results do not show a clear correlation between the TMAC and the molecular mass of the gas, as reported in some studies, [21][22][23] and disputed by others. 20, 34 4.…”

Section: Discussioncontrasting

confidence: 88%

Section: B Slip and Accommodation Coefficientsmentioning

confidence: 95%

See 1 more Smart Citation

Hydrodynamic force measurements under precisely controlled conditions: Correlation of slip parameters with the mean free path

et al. 2013

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“…Measurements of α u are typically performed by tracking the flow of gas through a microchannel. These experiments [38][39][40][41][42][43][44][45][46] are performed over a wide range of pressures at room temperature, and use microchannels with different shapes and diameters, constructed of various materials and surface treatments. Since the α u of each gas remains roughly constant across different conditions and flow regimes, it is justified to use the mean value of α u for each gas in the simulations.…”

Section: Simulation Parametersmentioning

confidence: 99%

A Comprehensive Cold Gas Performance Study of the Pocket Rocket Radiofrequency Electrothermal Microthruster

Charles

Boswell

2017

Front. Phys.

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This paper presents computational fluid dynamics simulations of the cold gas operation of Pocket Rocket and Mini Pocket Rocket radiofrequency electrothermal microthrusters, replicating experiments performed in both sub-Torr and vacuum environments. This work takes advantage of flow velocity choking to circumvent the invalidity of modeling vacuum regions within a CFD simulation, while still preserving the accuracy of the desired results in the internal regions of the microthrusters. Simulated results of the plenum stagnation pressure is in precise agreement with experimental measurements when slip boundary conditions with the correct tangential momentum accommodation coefficients for each gas are used. Thrust and specific impulse is calculated by integrating the flow profiles at the exit of the microthrusters, and are in good agreement with experimental pendulum thrust balance measurements and theoretical expectations. For low thrust conditions where experimental instruments are not sufficiently sensitive, these cold gas simulations provide additional data points against which experimental results can be verified and extrapolated. The cold gas simulations presented in this paper will be used as a benchmark to compare with future plasma simulations of the Pocket Rocket microthruster.

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“…The momentum accommodation coefficient depends on the type of fluid and wall material, and usually is selected from the range of 0.7 < f <1.0 (Duan and Muzychka, 2007;Ewart et al, 2007).…”

Section: Model Of Fluid In Boundary Layermentioning

confidence: 99%

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds

Jóźwik¹,

Karcz²,

Badur³

2011

Chemical and Process Engineering

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In this paper a three-dimensional model for determination of a microreactor's length is presented and discussed. The reaction of thermocatalytic decomposition has been implemented on the base of experimental data. Simplified Reynolds-Maxwell formula for the slip velocity boundary condition has been analysed and validated. The influence of the Knudsen diffusion on the microreactor's performance has also been verified. It was revealed that with a given operating conditions and a given geometry of the microreactor, there is no need for application of slip boundary conditions and the Knudsen diffusion in further analysis. It has also been shown that the microreactor's length could be practically estimated using standard models.

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Tangential momemtum accommodation in microtube

Cited by 88 publications

References 13 publications

Hydrodynamic force measurements under precisely controlled conditions: Correlation of slip parameters with the mean free path

Hydrodynamic force measurements under precisely controlled conditions: Correlation of slip parameters with the mean free path

A Comprehensive Cold Gas Performance Study of the Pocket Rocket Radiofrequency Electrothermal Microthruster

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds

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