Results 21 to 30 of about 1,805 (310)
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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Data-driven nonlinear constitutive relations for rarefied flow computations
Advances in Aerodynamics, 2021 To overcome the defects of traditional rarefied numerical methods such as the Direct Simulation Monte Carlo (DSMC) method and unified Boltzmann equation schemes and extend the covering range of macroscopic equations in high Knudsen number flows, data ...
Wenwen Zhao +3 more
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Rarefied gas flow through a slit.
SHINKU, 1990 A rarefied gas flow through a slit in an infinite plane wall, induced by a small pressure difference across the slit, is studied on the basis of the kinetic theory. The system of integral equations for the macroscopic variables (the velocity, density, and temperature of the gas), derived from the linearized Boltzmann–Krook–Welander equation with the ...
HASEGAWA, Manabu, SONE, Yoshio
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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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Measurement of the heat transfer coefficient in gas spray cooling with low liquid flow rate [PDF]
E3S Web of Conferences, 2023 The rapid development of high power electronic, energy systems has led us to the fact that the performance of these systems is limited by their cooling capacity. Spray cooling is one of the most effective methods for cooling heated surfaces.
Sibiryakov Nikolay +2 more
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DSMC–LBM mapping scheme for rarefied and non-rarefied gas flows [PDF]
Journal of Computational Science, 2016 We present the formulation of a kinetic mapping scheme between the Direct Simulation Monte Carlo (DSMC) and the Lattice Boltzmann Method (LBM) which is at the basis of the hybrid model used to couple the two methods in view of efficiently and accurately simulate isothermal flows characterized by variable rarefaction effects. Owing to the kinetic nature
Gianluca Di Staso +3 more
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Comparing macroscopic continuum models for rarefied gas dynamics : a new test method [PDF]
, 2006 We propose a new test method for investigating which macroscopic continuum models, among the many existing models, give the best description of rarefied gas flows over a range of Knudsen numbers.
Zheng, Yingsong +2 more
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Rarefied gas flows through meshes and implications for atmospheric measurements [PDF]
Annales Geophysicae, 2001 Meshes are commonly used as part of instruments for in situ atmospheric measurements. This study analyses the aerodynamic effect of meshes by means of wind tunnel experiments and numerical simulations. Based on the Direct Simulation Monte Carlo method,
J. Gumbel
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On the modelling of isothermal gas flows at the microscale [PDF]
, 2008 This paper makes two new propositions regarding the modelling of rarefied (non-equilibrium) isothermal gas flows at the microscale. The first is a new test case for benchmarking high-order, or extended, hydrodynamic models for these flows.
Reese, Jason M., Lockerby, Duncan A.
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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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