منابع مشابه
A lattice Boltzmann model for thermal transpiration
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متن کاملThermal Transpiration Flow in Annular Microchannels
Thermal transpiration flows of rarefied gases in annular channels are considered, where the driving force for the flow is a temperature gradient applied in the channel walls. The influence of gas rarefaction, aspect ratio of the annulus, and surface accommodation coefficient on mass and heat transfer in the process are investigated. For this, the linearized Navier– Stokes–Fourier (NSF) and regu...
متن کاملLattice Boltzmann model for thermal transpiration.
The conventional Navier-Stokes-Fourier equations with no-slip boundary conditions are unable to capture the phenomenon of gas thermal transpiration. While kinetic approaches such as the direct simulation Monte Carlo method and direct solution of the Boltzmann equation can predict thermal transpiration, these methods are often beyond the reach of current computer technology, especially for compl...
متن کاملEnergy Conversion using Thermal Transpiration : Optimization of a Knudsen
Knudsen compressors are devices without any moving parts that use the nanoscale phenomenon of thermal transpiration to pump or compress a gas. Thermal transpiration takes place when a gas is in contact with a solid boundary along which a temperature gradient exists. If the characteristic length scale is on the order of, or smaller than, the molecular mean free path, then the gas flows from cold...
متن کاملNumerical simulation of gas-phonon coupling in thermal transpiration flows.
Thermal transpiration is a rarefied gas flow driven by a wall temperature gradient and is a promising mechanism for gas pumping without moving parts, known as the Knudsen pump. Obtaining temperature measurements along capillary walls in a Knudsen pump is difficult due to extremely small length scales. Meanwhile, simplified analytical models are not applicable under the practical operating condi...
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ژورنال
عنوان ژورنال: Proceedings of the Physical Society of London
سال: 1918
ISSN: 1478-7814
DOI: 10.1088/1478-7814/31/1/328