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Gerasimova, O. E.; Borisov, S. F.; Boragno, C.; Valbusa, U.

doi:10.1023/a:1023677807018

Cited by 3 publications

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References 6 publications

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“…New advantages in surface controls based on SPM technique and Atomic Force Microscopy (AFM), have been involved in the last few years to serve rarefied gas dynamics purposes and now are used for gathering information on a wide range of surface structure parameters from an atomic to macroscopic scale. We have applied this experimental approach recently, together with our Italian partners for the INTAS project (University of Genoa group), for studying structural change in Si single crystal samples exposed to a gas atmosphere [14]. Now we are attempting to use it for studying surface degradation of Si-based Thermal Protection Materials (TPM) as a result of plasma exposure.…”

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confidence: 99%

Progress in Gas-Surface Interaction Study

Borisov¹

2005

AIP Conference Proceedings

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Section: Bmentioning

confidence: 99%

Progress in Gas-Surface Interaction Study

Borisov¹

2005

AIP Conference Proceedings

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The Monte Carlo and Molecular Dynamics Simulation of Gas-Surface Interaction

Borisov¹,

Sazhin²,

Gerasimova³

2005

Lecture Notes in Computer Science

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A testing procedure and a program product for modeling gas-surface scattering process have been developed. Using the developed product the numerical simulation of the thermal transpiration phenomenon at free molecular conditions of the gas flow in channels with the use of different scattering kernels has been carried out. The surface structure influence on energy and momentum exchange in a gas-surface system has been studied by the use of Molecular Dynamics method.

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Numerical simulations of gas-dynamic conductivity of microchannels with allowance for their surface structure

Ukhov¹,

Porodnov²,

Borisov

2009

J Appl Mech Tech Phy

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The effect of the microchannel surface structure on the free-molecular gas flow is studied by the testparticle method. Simulations are performed for channels whose surface either is obtained by means of statistical modeling or is reconstructed from the data of atomic-force microscopy of real surfaces. Dependences of monochromatic molecular beam scattering on the angle of incidence and the average height of microscopic roughness elements on the surface are considered. It is demonstrated that the method developed allows one to obtain the distribution function for particles reflected from a rough surface and to use it in the boundary conditions in problems of rarefied gas dynamics.Key words: rarefied gas flow in microchannels, Monte Carlo test-particle method, gas-surface interaction, scattering indicatrices, atomic-force microscopy.Introduction. In solving gas-dynamic problems associated with re-entry of flying vehicles into the upper atmospheric layers or with gas flows in microscale or nanoscale devices, one should take into account the parameters characterizing the structure and chemical composition of the surface. Numerous experimental studies show that the surface structure, its temperature, and other factors exert a significant effect on scattering of rarefied gas molecules and, as a consequence, on the gas-dynamic drag and heat transfer in the gas-solid system [1].One important component of the model of gas dynamics in external and internal flows are the boundary conditions for the Boltzmann equation, which imply that the distribution function of gas molecules reflected from the surface is available in an analytical form. This function depends on many characteristics of the gas and the surface, and also on thermodynamic parameters of the system as a whole. One factor exerting a significant effect on energy and momentum transfer in the gas-solid system is physical inhomogeneity (roughness) of the surface.Because of the lack of information about the surface structure and its role in gas-solid interaction, approaches with the use of absolutely smooth surfaces or extremely simple roughness models are usually used [2]. The influence of the surface structure on the free-molecular gas flow in cylindrical channels was studied in experiments [3,4].The development of methods of computer modeling and the use of new experimental technologies, in particular, scanning probe microscopy, allow certain progress to be achieved in numerical simulations of gas scattering on rough surfaces and in the description of rarefied gas flows in channels with the surface structure corresponding to conditions of physical experiments [5][6][7].The use of atomic force microscopy allows one to obtain high-resolution three-dimensional topograms. The thus-obtained digitized surface is an array whose elements contain the coordinates of each point of the surface of the examined sample. In the present work, we used the coordinates of 160 thousand points on the surface of a 20 × 20 μm silicon single crystal. In the course of studying the specified...

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Untitled

Cited by 3 publications

References 6 publications

Progress in Gas-Surface Interaction Study

Progress in Gas-Surface Interaction Study

The Monte Carlo and Molecular Dynamics Simulation of Gas-Surface Interaction

Numerical simulations of gas-dynamic conductivity of microchannels with allowance for their surface structure

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