Results 21 to 30 of about 4,796,208 (227)
Planetesimals in rarefied gas: wind erosion in slip flow [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT A planetesimal moves through the gas of its protoplanetary disc where it experiences a head wind. Though the ambient pressure is low, this wind can erode and ultimately destroy the planetesimal if the flow is strong enough. For the first time, we observe wind erosion in ground-based and microgravity experiments at pressures ...
Gerhard Wurm +5 more
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A topology optimization method for rarefied gas flows
Nihon Kikai Gakkai ronbunshu, 2017 We construct a topology optimization method for two dimensional rarefied gas flow problems, based on level-set boundary expressions. The degree of rarefaction is expressed by the Knudsen number, which is the ratio of the mean free path and the ...
Ayami SATO +4 more
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AIP Advances, 2020 Rarefied gas flow has received wide attention due to the booming of micro/nano-electromechanical systems and aerospace engineering. Under such rarefied conditions, the frequency of intermolecular collisions is sharply reduced, so the impacts of ...
Hang Yu, Ye Zhang, Fan Yang, Hua Li
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Aerodynamic optimization of NACA 0012 airfoils with attached Gurney flap in the rarefied gas flow
AIP Advances, 2023 The aerodynamic optimization of a Gurney flap attached to the NACA 0012 airfoil in rarefied gas flow is studied in this study. In order to investigate the effects of Gurney flap geometry (height, mounting angle, and mounting location) and angle of attack
Keren Lin +4 more
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Experimental Study on Gas Flow in a Rough Microchannel
Frontiers in Energy Research, 2022 The shape and relative roughness of a rough surface have an important influence on microscale flow and heat transfer. In this study, a rectangular silicon microchannel (0.8 mm width and 11.9 μm height) with a large width-depth ratio is fabricated by the ...
Deming Li +6 more
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Energies, 2023 In this study, we first considered the influence of micro-nozzle wall roughness structure on molecular collision and reflection behavior and established a modified CLL model.
Xuhui Liu +4 more
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Gas-kinetic scheme for rarefied flow simulation [PDF]
Mathematics and Computers in Simulation, 2006 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kun Xu 0001, Eswar Josyula
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Higher-order Knudsen's permeability correction model for rarefied gas in micro-scale channels
Natural Gas Industry B, 2019 Rarefaction effect appears when gas flows in micro/nano channels, so it is difficult to accurately predict real gas flow rate by using the classical theory.
Yinbin Lu
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Highly rarefied gas flows in rough channels of finite length
Advances in Aerodynamics, 2023 Highly rarefied gas flows through a rough channel of finite length with small bumps appended to its surfaces are investigated, by varying the accommodation coefficient $$\alpha$$ α in Maxwell’s diffuse-specular boundary condition, the characteristic size
Zheng Shi, Yulong Zhao, Wei Su, Lei Wu
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A comparison of simulation methods for rarefied gas flows [PDF]
Physics of Fluids, 1995 Simulation methods like DSMC are efficient tools to compute rarefied gas flows. Using supercomputers it is possible to include various real gas effects like vibrational energies or chemical reactions in a gas mixture. Nevertheless it is still necessary to improve the accuracy of the current simulation methods in order to reduce the computational effort.
Struckmeier, Jens, Steiner, Konrad
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