On mechanisms of choked gas flows in microchannels

Shan, Xinyan; Wang, Moran

doi:10.1016/j.physleta.2015.07.036

Cited by 14 publications

(3 citation statements)

References 39 publications

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“…The intensified non-equilibrium effects at the Knudsen numbers higher than 1 results in a change in the slope of the mass flow rate variations with the Knudsen number. For any fixed divergence angle and Knudsen number, there is a critical pressure ratio that further reduction in the back pressure to increase the pressure ratio does not result in the mass flow rate increase [31,42].…”

Section: Resultsmentioning

confidence: 99%

DSMC investigation of rarefied gas flow through diverging micro- and nanochannels

Ebrahimi

Roohi

2017

Microfluid Nanofluid

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Direct simulation Monte Carlo (DSMC) method with simplified Bernoulli-trials (SBT) collision scheme has been used to study the rarefied pressure-driven nitrogen flow through diverging microchannels. The fluid behaviours flowing between two plates with different divergence angles ranging between 0 o to 17 o are described at different pressure ratios (1.5≤Π≤2.5) and Knudsen numbers (0.03≤Kn≤12.7). The primary flow field properties, including pressure, velocity, and temperature, are presented for divergent microchannels and are compared with those of a microchannel with a uniform cross-section. The variations of the flow field properties in divergent microchannels, which are influenced by the area change, the channel pressure ratio and the rarefication are discussed. The results show no flow separation in divergent microchannels for all the range of simulation parameters studied in the present work. It has been found that a divergent channel can carry higher amounts of mass in comparison with an equivalent straight channel geometry. A correlation between the mass flow rate through microchannels, the divergence angle, the pressure ratio, and the Knudsen number has been suggested. The present numerical findings prove the occurrence of Knudsen minimum phenomenon in micro-and Nano-channels with non-uniform cross-sections.

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Section: Resultsmentioning

confidence: 99%

DSMC investigation of rarefied gas flow through diverging micro- and nanochannels

Ebrahimi

Roohi

2017

Microfluid Nanofluid

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“…可见声子Boltzmann方程的零阶展开解可以概括前人很多不同方法得到的声子水动力学方程. 方程(39)中的非线性项将带来有趣的热流饱和现象(Flux-Limited Behaviors) [59] , 这种现象类似于流体力学中的壅塞现象 [60] , 其大致的物理机制存在一个最大值, 即饱和热流密度 [61] . 由于具有较为严格的动理论基础, 声子水动力学模型可为描述这种热流饱和现象的不同非线性导热模型提供一个衡量和比较的标准 [61] .…”

Section: 述可基于粒子图像其介观描述的控制方程为声子unclassified

Phonon hydrodynamics: progress, applications and perspectives

Guo¹,

Wang²

2017

Sci. Sin.-Phys. Mech. Astron.

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Recent research and progress of biodegradable zinc alloys and composites for biomedical applications: Biomechanical and biocorrosion perspectives Bioactive Materials 6, 836 (2021); Nonlinear waves and wave-structure interactions in marine hydrodynamics-Recent progress SCIENCE CHINA Technological Sciences 55, 3253 (2012); Roles and mechanisms of ginsenoside in cardiovascular diseases: progress and perspectives SCIENCE CHINA Life Sciences 59, 292 (2016); Ultrahigh performance concrete-properties, applications and perspectives

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“…Based on simple models, it is possible to reveal basic physical patterns of the fluid flow, and nowadays, as the numerical simulation becoming popular and easy accessing, complex flows can be studied deeply with consideration of different channel characters [20,21]. One of the powerful numerical methods for complex flows is the lattice Boltzmann method (LBM), which has a mesoscale-oriented background and fits for capturing flow details.…”

Section: Introductionmentioning

confidence: 99%

Morphology Effect of Surface Structures on Microchannel Flow Using Lattice Boltzmann Method

Zhang

Liu

et al. 2019

Geofluids

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Microchannel flow shows a fascinating background on a lot of engineering problems. In order to shed a light on the effect of the surface morphology of microchannels on fluid flow, differently shaped and arranged artificial elements constitute channels with different morphology and numerical simulation based on lattice Boltzmann method is conducted. The impact of micro effect is also stressed by comparing the results considering and not considering it in the same channel model. Analysis of flow details shows the difference of the morphology effect on fluid flow, which differs by the shape and density of the elements’ array. The permeability of channels shows a specific relationship with the density of artificial elements, and differences are found between varied shapes and the existence of micro effects. Further research is carried based on more complex channels with arrays of fractal-character artificial elements. As elements in the channel can be divided into main summits and subsummits, their different roles of the effect on the fluid flow is investigated. The result shows that the permeability will not change if main summits are kept in channels while all subsummits are removed to make a distinct simplification of the morphology. This discovery is furtherly ensured numerically by a test on a channel created with the profile of a rough rock surface. The finding for morphology effect on fluid flow can supply a reference for the prediction of the permeability of complex channels or fractures.

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On mechanisms of choked gas flows in microchannels

Cited by 14 publications

References 39 publications

DSMC investigation of rarefied gas flow through diverging micro- and nanochannels

DSMC investigation of rarefied gas flow through diverging micro- and nanochannels

Phonon hydrodynamics: progress, applications and perspectives

Morphology Effect of Surface Structures on Microchannel Flow Using Lattice Boltzmann Method

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