Nanoporous Bi2Te3 thermoelectric based Knudsen gas pump.

Faiz, Abderrazzak

doi:10.18297/etd/419

Cited by 3 publications

(6 citation statements)

References 68 publications

(79 reference statements)

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“…This may be due to the sintering atmosphere, argon, since the melting temperature (585°C) for Bi 2 Te 3 is not reached yet. Rhombohedral, PDF 01-072-1836 [194].…”

Section: Sintering Experiments 382mentioning

confidence: 99%

“…The sample was set flat on the heated stage, for each applied power, the line scan feature was used to plot the temperature distribution and therefore obtain the temperature difference. Pressure is permitted to come to room pressure before switching the voltage polarity [194].…”

Section: Temperature Measurement On the Thermoelectric Sintered Samplmentioning

confidence: 99%

“…Graph of the pressure versus flow rate that is obtained for three different levels of power in the nanoporous TE. The marks are the experimentally obtained data, and the lines represent a linear fit to the measurements [194].…”

Section: Pressure Flow Rate Relationshipmentioning

confidence: 99%

“…This chapter describes a mathematical model of the thermoelectric (TE) based Knudsen pump [194]. The model is derived using well-established TE equations, which relate the different parameters of a TE element, and the Sharipov's equation connecting the mass flow rate and pressure data for a Knudsen pump.…”

Section: Knudsen Pumpmentioning

confidence: 99%

“…96 Figure 3.32: Experimental pressure differential obtained with the fabricated Knudsen pump in figure 3.31. Pressure is permitted to come to room pressure before switching the voltage polarity [194] Figure 3.34: Graph of the pressure versus flow rate that is obtained for three different levels of power in the nanoporous TE. The marks are the experimentally obtained data, and the lines represent a linear fit to the measurements [194] is zero and that is the maximum pressure for a given voltage and current.…”

mentioning

confidence: 99%

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Nanoporous Bi₂Te₃thermoelectric based Knudsen gas pump

Faiz¹,

McNamara²,

Bell³

et al. 2014

J. Micromech. Microeng.

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The first bi-directional thermoelectric based Knudsen pump is made using a multifunctional nanoporous P-type bismuth telluride (Bi 2 Te 3 ) thermoelectric material. The nanoporous material has been fabricated using a cold pressing and sintering technique under an argon atmosphere. Analysis of the nanoporous thermoelectric shows the average grain size is 680 nm, the pore radius ranges from 205 to 756 nm, and the average pore radius is 434 nm corresponding to a Knudsen number of 0.075 in the transitional flow regime. Gas flow due to the principle of thermal transpiration was demonstrated using a thermal gradient generated by running current through the thermoelectric, and measuring the gas flow rate and pressure. For an input power of 3.32 W, a maximum of 300 Pa pressure and 1.8 μl min −1 flow rate was observed. A reduction of the pore size down to 25 nm, and an improvement of the electrical contact resistance should lead to a 16 time increase in the generated pressure, and reduction in the consumed power respectively.

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“…This may be due to the sintering atmosphere, argon, since the melting temperature (585°C) for Bi 2 Te 3 is not reached yet. Rhombohedral, PDF 01-072-1836 [194].…”

Section: Sintering Experiments 382mentioning

confidence: 99%

Section: Temperature Measurement On the Thermoelectric Sintered Samplmentioning

confidence: 99%

Section: Pressure Flow Rate Relationshipmentioning

confidence: 99%

Section: Knudsen Pumpmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Nanoporous Bi₂Te₃thermoelectric based Knudsen gas pump

Faiz¹,

McNamara²,

Bell³

et al. 2014

J. Micromech. Microeng.

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Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

et al. 2022

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This article presents an analysis of kinetic studies of dry methane reforming (DRM) in a reactor with a membrane catalyst (RMC) in the modes of a contactor with “diffusion” and “forced” mass transfer. Comparison of the specific rate constants of the methane dissociation reaction in membrane and traditional reactors confirmed the phenomenon of intensification of dry methane reforming in a membrane catalyst (MC). It has been experimentally established that during DRM, a temperature gradient arises in the channels of the pore structure of the membrane catalyst, characterized by a decrease in temperature towards the inner volume of the MC, and initiates the phenomenon of thermal slip. The features of this phenomenon are highlighted and must be considered in the analysis of kinetic data. The main provisions of the hypothesis explaining the effect of intensification by the occurrence of thermal slip in the channels of the pore structure of the MC are formulated. The proposed hypothesis, based on thermal slip, explains the difference in rate constants of traditional and membrane catalysts, and substantiates the phenomenological scheme of DRM stages in a reactor with a membrane catalyst.

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Study of Flow Characteristics of Gas Mixtures in a Rectangular Knudsen Pump

et al. 2019

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A Knudsen pump operates under the thermal transpiration effect or the thermal edge effect on the micro-scale. Due to the uneven temperature distribution of the walls in the channel axis direction or the constant temperature of the tips on the walls, directional thermally-induced flow is generated. In this paper the Direct Simulation Monte Carlo (DSMC) method is applied for N2–O2 gas mixtures in the ratios of 4:1, 1:1, and 1:4 with different Knudsen numbers in a classic rectangular Knudsen pump to study the flow characteristics of the gas mixtures in the pump. The results show that the changing in the gas physical properties does not affect the distribution of the velocity field, temperature fields, or other fields in the Knudsen pump. The thermal creep effect is related to the molecular mass of the gas. Even in N2 and O2 gas mixtures with similar molecular masses, N2 can be also found to have a stronger thermal creep effect. Moreover, the lighter molecular weight gas (N2) can effectively promote the motion of the heavier gas (O2).

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Nanoporous Bi2Te3 thermoelectric based Knudsen gas pump.

Cited by 3 publications

References 68 publications

Nanoporous Bi₂Te₃thermoelectric based Knudsen gas pump

Nanoporous Bi₂Te₃thermoelectric based Knudsen gas pump

Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

Study of Flow Characteristics of Gas Mixtures in a Rectangular Knudsen Pump

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Nanoporous Bi2Te3 thermoelectric based Knudsen gas pump.

Cited by 3 publications

References 68 publications