Measurement of thermal transpiration across an array of parallel capillaries using a differential capacitance manometer

York, D.C; Chambers, A.; Chew, Andrew; Troup, A. P.

doi:10.1016/s0042-207x(99)00139-6

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…Recently, these results were used to study the thermal transpiration in helium and nitrogen across an individual 18 or an array of silica capillaries. 19 Some related experimental, 20 theoretical ͓Bhatnagar-Gross-Krook ͑BGK͒ model͔, [21][22][23][24][25][26] and numerical ͓one-dimensional and two-dimensional direct simulation Monte Carlo ͑DSMC͔͒ 23,27-30 work can be mentioned in this regard. The Knudsen forces arising in such cases display a peak as a function of the Knudsen number.…”

Section: Background Theorymentioning

confidence: 99%

Knudsen forces on microcantilevers

Passian

Wig

Mériaudeau

et al. 2002

Journal of Applied Physics

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When two surfaces at two different temperatures are separated by a distance comparable to a mean-free path of the molecules of the ambient medium, the surfaces experience Knudsen force. This mechanical force can be important in microelectromechanical systems and in atomic force microscopy. A theoretical discussion of the magnitude of the forces and the conditions where they can be encountered is discussed. A potential application of the Knudsen force in designing a cantilever-based vacuum gauge is discussed.

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Section: Background Theorymentioning

confidence: 99%

Knudsen forces on microcantilevers

Passian

Wig

Mériaudeau

et al. 2002

Journal of Applied Physics

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“…The possibility of using the pumping effect of thermal transpiration to create a microcompressor without moving parts led to the experimental works of Vargo et al 12 in 1999 and Han et al 13 in 2007, in which the attention is mainly focused on the pressure increase due to the application of a temperature gradient along a channel. This final work of Han et al 13 together with the work of York et al 14 in 1999 gave a first characterization of the transitional stage of gas displacement by measuring the pressure variation in time before reaching the final zero-flow state. At the moment, no real efforts have been made to measure the mass flow rate induced by thermal transpiration.…”

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confidence: 99%

Thermal transpiration flow: A circular cross-section microtube submitted to a temperature gradient

et al. 2011

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International audienceThermal transpiration is the macroscopic movement of rarefied gas molecules induced by a temperature gradient. The gas moves from the lower to the higher temperature zone. An original method is proposed here to measure the mean macroscopic movement of gas in the case of a long circular cross-section glass microtube onto which a gradient of temperature is applied. The mass flow rate and the thermomolecular pressure difference have been measured by monitoring the absolute pressure evolution in time at both ends of the capillary using high-speed response pressure gauges. Two gases, nitrogen and helium, are studied and three different temperature differences of 50, 60, and 70 ° C are applied to the tube. The analyzed gas rarefaction conditions vary from transitional to slip regime

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“…The research has been carried out by means of experimental analysis, direct simulation Monte-Carlo modeling and BGK calculations. Several other authors have as well dedicated some attention to the thermal transpiration phenomenon, such as York et al (23) (24) and Hadacek et al (25) which stayed on the line of previous works. Others, as Passian et al (26) , who measured the forces exerted on a mechanical Cantilever by a thermal transpiration induced flow, and Gupta et al (27) , who created a compact Knudsen compressor using zeolite disks, produced both innovative and creative works which deserve further exploration.…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 55%

An Experimental and Numerical Study of the Final Zero-Flow Thermal Transpiration Stage

Rojas-Cárdenas

Graur

Perrier

et al. 2012

JTST

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By just applying a temperature difference to a micro-system filled with rarefied gas, it is possible to engender a displacement or a compression of the gas in the temperature gradient direction. This is the Thermal Transpiration phenomenon. In the present work, thermal transpiration has been studied both through an experimental approach, which exploits an original measuring system, and through a numerical approach, which is modeled on the basis of the Shakhov model kinetic equation. In both studies, a circular cross section glass micro-tube is submitted to a temperature gradient. The obtained results for Helium, such as the thermal molecular pressure difference, the thermal molecular pressure ratio and the thermal molecular pressure exponent at the final zero-flow stage, are analyzed in the case of a tube submitted to a temperature difference of 51 K. Finally, the obtained thermal molecular pressure ratio results are also compared to the semi-empirical formulas of Liang (1951) and Takaishi and Sensui (1963). These semi-empirical formulas are still in use nowadays to introduce correction factors for pressure measurements done when the pressure gauge functions at different temperatures in respect to the temperature of the operating gas. For the here working pressure conditions and the used tube dimensions the gas rarefaction conditions go from near free molecular to slip regime.

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Measurement of thermal transpiration across an array of parallel capillaries using a differential capacitance manometer

Cited by 10 publications

References 8 publications

Knudsen forces on microcantilevers

Knudsen forces on microcantilevers

Thermal transpiration flow: A circular cross-section microtube submitted to a temperature gradient

An Experimental and Numerical Study of the Final Zero-Flow Thermal Transpiration Stage

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