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Knudsen Pumps: A Review – (PDF) Knudsen pumps: a review

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This paper proposes critical and comprehensive reviews of slip and jump phenomena and their modelings, the Knudsen paradox, and thermally-driven flows with . The variable soft sphere (VSS) model is applied . Skip to search form Skip to main content Skip to account menu. To boost their uptake, the .

Knudsen pump inspired by Crookes radiometer with a specular wall

A hybrid integrated energy system (HIES) optimal scheduling model is developed by considering energy storage (ES), solar thermal (ST), wind turbine (WT), .The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied gas environments.

Demonstration of a Gas Separator Composed of Knudsen Pumps

1038/s41378-020-0135-5 Xiaowei Wang 1, Tianyi Su 1, Wenqing Zhang 1, Zhijun Zhang 1, Shiwei Zhang 1.The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied gas environments.

Theoretical Efficiency of a Microfabricated Knudsen Pump

The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature . In contrast with past work, the membrane material is mixed .The pressure inside a Knudsen membrane is built up due to the flow restriction of the gas molecules.

Physics Reports

The only energy source of the gas separator is the temperature difference up to 100 K. This type of pump relies upon the motion of gas .

Knudsen pumps: a review | Microsystems & Nanoengineering

Zhang and his team from China’s .While mesoscale (multistage) Knudsen pumps have demonstrated compression ratios of ≈1.“Knudsen pumps: a review”出自《微系统与纳米工程（英文）》期刊2020年第2期文献，主题关键词涉及有等。 Knudsen pumps, which operate on the principle of thermal transpiration, have been shown to have great promise for micro-scale gas phase fluidic systems such as micro gas chromatographs.

Figure 1 from A high-flow Knudsen pump using a polymer membrane ...

Since the hot and cold sides of the . The thermoelectric material maintains a higher temperature difference which favors thermal transpiration and thus increases the efficiency of gas pumping. The thermoelectric . A temperature gradient along the length of a pore that supports free molecular gas flow at atmospheric pressure pumps gas molecules from the cold end to the hot end.Knudsen pumps: a review Microsystems & Nanoengineering ( IF 7.A comprehensive review on micro-and nano-scale gas flow effects: Slip-jump phenomena, Knudsen paradox, thermally-driven flows, and Knudsen pumps Phys.The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced ows induced by temperature fields in rarefied gas environments. Tobias Baier, Steffen Hardt, Vahid Shahabi, and Ehsan Roohi. Sign In Create Free Account.A model gas separator composed of two Knudsen pumps is fabricated.

Knudsen pump

This single-stage micromachined Knudsen pump used a six-mask, two-wafer process.Knudsen pumps: a review Xiaowei Wang, Tianyi Su, Wenqing Zhang, Zhijun Zhang and Shiwei Zhang Microsyst Nanoeng, 2020, 6 DOI: 10., thermal creep flow Knudsen pump, thermal edge flow Knudsen pump, and radiometric flow Knudsen pump, will be .In this section, different types of Knudsen pumps, i.1038/s41378-020-0135-5 Xiaowei Wang .This paper reports an evaluation and a comparison of two architectures for implementing Si-micromachined high-flow Knudsen pumps.

10: Knudsen pump implemented in a microfabricated gas chromatograph ...

This paper describes the derivation of the maximum theoretical efficiency for a Knudsen pump.The first bi-directional thermoelectric based Knudsen pump is made using a multifunctional nanoporous P-type bismuth telluride (Bi2Te3) thermoelectric material.Applications of Knudsen compressors as both microscale and macroscale vacuum pumps have been investigated.

[PDF] Knudsen pumps: a review

The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in .This paper describes the analysis, design, and microfabrication of a Knudsen pump for high flow generation.REVIEW ARTICLE Open Access Knudsen pumps: a review Xiaowei Wang 1,TianyiSu1, Wenqing Zhang1, Zhijun Zhang 1 and Shiwei Zhang1 Abstract The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied gas environments. The Knudsen pump generates gas streams from the cold end to the hot end using free-molecular flow without moving parts. 1 – 60 View PDF View article View in Scopus Google Scholar The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied gas environments. Microsystems & Nanoengineering ( IF 7. An increasing number of researchers now dedicate great attention to the developments in the modeling . With no moving parts, KPs .This paper describes a miniature gas (Knudsen) pump that utilizes thermomolecular flow through a nanoporous membrane. We present a new model to estimate the performance of a wind turbine operating in misaligned conditions. In this paper, the direct simulation Monte Carlo (DSMC) method is used to investigate numerically the flow characteristics of H2–N2 mixtures in the Knudsen pump.004 Corpus ID: 253785391; A comprehensive review on micro- and nano-scale gas flow effects: Slip-jump phenomena, Knudsen paradox, thermally-driven flows, and Knudsen pumps

Numerical investigation into the compression characteristics

The Knudsen pump functions on the principle of thermal transpiration in rarified gas conditions. The Knudsen pumps based on thermal creep flows have great application potential in the micro-power systems. Thus a hot vacuum chamber transpires into the cold chamber.Knudsen pumps: a review Xiaowei Wang 1,TianyiSu1, Wenqing Zhang1, Zhijun Zhang 1 and Shiwei Zhang1 Abstract The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows . Instead it uses thermal transpiration, the phenomenon that gas molecules drift from the hot end to the cold end of a narrow channel.钛学术提供该文献下载服务。A high-flow Knudsen pump using a polymer membrane: Performance at and below atmospheric pressures Abstract: This paper describes a miniature gas (Knudsen) pump . The designed Knudsen pump has densely arrayed vertically oriented 2-μm wide rectangular channels for . 钛学术提供该文献下载服务。The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied .Knudsen pump inspired by Crookes radiometer with a specular wall. The rarified gas conditions are established by having the .The Knudsen pump also referred to as thermal transpiration pump or Knudsen compressor is a gas pump that utilizes no moving parts.In Knudsen pumps with geometric configuration of rectangle, gas flows are induced by temperature gradients along channel walls.Knudsen pumps (KPs) have been shown to provide bidirectional pumping without moving parts [11,12,13]. 997 ( 2023 ) , pp.A Comprehensive Review on Micro- and Nano-Scale Gas Flow Effects: Slip-Jump Phenomena, Knudsen Paradox, Thermally-Driven Flows, and Knudsen Pumps Volume 997, Pages 1-60 (26 January 2023) The study is based on a cascade analysis .

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Knudsen Flow

Analysis of the nanoporous thermoelectric shows the . Variation of the temperature, from low to high, across the membrane facilitates the thermal . Thus, the development and downsizing of next-generation thermal transpiration gas pumps has been investigated intensively .

Knudsen pumps: a review

It has the advantages of . Jan 2020; Xiaowei Wang; The Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in .

Relation of Kn to mass flow rate | Download Scientific Diagram

Of the ceramics evaluated, a clay-based, 15 bar synthetic ceramic (15PC) .Coupling Knudsen pumps with pneumatic artificial micro-muscles appears as an original and innovative field of investigation with interesting scientific and technical challenges.Knudsen pumps are motionless gas pumps that utilize thermal transpiration along a channel or a set of channels; the channels must have a temperature gradient and must constrain the flow to remain within the free molecular or transitional flow regimes.Knudsen pumps: a review. This flow is evident only .Knudsen pumps are micro-sized, non-mechanical gas pumps that can be useful in a range of biomedical and mechanical fields.Knudsen pumps (KPs) generate gas flow using thermal transpiration in narrow channels with a longitudinal temperature gradient. Semantic Scholar’s Logo .9 ) Pub Date: 2020-06-15 , DOI: 10.

Knudsen pumps: a review | Microsystems & Nanoengineering

This paper describes a thermal transpiration-driven multistage Knudsen pump for vacuum pumping applications.

Demonstration of motionless Knudsen pump based micro-gas chromatography ...

The nanoporous material has been fabricated using a cold pressing and sintering technique under an argon atmosphere. Gas microflows through these devices are often in the slip and transition flow regimes, characterized by the Knudsen number of the order of 10−2~100.2 [37, 38], the first fully micromachined on-chip single-stage Knudsen pump, reported in 2005, achieved a compression ratio of ≈2 .Accurate modeling of gas microflow is crucial for the microfluidic devices in MEMS. A monolithic Si-micromachined four-stage Knudsen pump for µGC applications Tsenguun Byambadorj, Qisen Cheng, Yutao Qin and Yogesh B Gianchandani .9) Pub Date : 2020-06-15, DOI: 10.The first use of a thermoelectric material in the bidirectional operation of a gas pump using thermal transpiration has been demonstrated.The CCC says that to get back on track for 2030, the proportion of homes using heat pumps for their heating needs to rise from 1% today to 10%. In this paper, the performance of the compression system comprised of a cascading multi-stage Knudsen pump for rarefied .Autor: Xiaowei Wang, Tianyi Su, Wenqing Zhang, Zhijun Zhang, Shiwei Zhang

(PDF) Knudsen pumps: a review

It has the advantages .Request PDF | A Monolithic High-Flow Knudsen Pump Using Vertical Al₂O₃ Channels in SOI | This paper describes the analysis, design, and microfabrication of a Knudsen pump for high flow generation.In the rarefied gas, thermal creep flows are induced by temperature gradients along the walls.AbstractThe Knudsen pump (KP) is a kind of micro-pump that can form thermally induced flows induced by temperature fields in rarefied gas environments.064 Corpus ID: 248805616; Flow and transmission characteristics of the multistage hydrogen Knudsen pump in the micro-power system @article{Lan2022FlowAT, title={Flow and transmission characteristics of the multistage hydrogen Knudsen pump in the micro-power system}, author={Jiang Lan and Junlong .

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Knudsen pumps: a review-期刊-钛学术文献服务平台

The pump requires only a temperature difference between the inlet and the outlet to operate.Autor: Xiaowei Wang, Tianyi Su, Wenqing Zhang, Zhijun Zhang, Shiwei Zhang

Knudsen pumps: a review

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RSC Publishing

Semantic Scholar extracted view of Demonstration of a gas separator composed of Knudsen pumps by S. It has the advantages of having no moving parts, simple .1038/s41378-020-0135-5. KPs utilize the principle of thermal transpiration, wherein the net flux of gas molecules is induced against the temperature gradient in the direction from the low temperature region to the high temperature region . Search 218,599,694 papers from all fields of science. The model is based on the classic momentum .Autor: Xiaowei Wang

Knudsen pumps: a review

7: Knudsen pump for generating vacuum environments [60]: (a) close-up ...

With growing public interest in portable electronics such as micro fuel cells, micro gas total analysis systems, and portable medical devices, the need for miniaturized air pumps with minimal electrical power consumption is on the rise.