Topic
Knudsen number
About: Knudsen number is a research topic. Over the lifetime, 5052 publications have been published within this topic receiving 104278 citations.
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TL;DR: It is argued that Bobylev's results can be reinterpreted as to give a bound for the Knudsen number above which the Burnett equations are not valid, and his analysis, originally made for Maxwellian molecules, for any interaction potential, is partially extended.
Abstract: In 1982 Bobylev [A.V. Bobylev, Sov. Phys. Dokl. 27, 29 (1982)] made a linear stability analysis of the Burnett equations and showed that beyond a certain critical reduced wave number there exist normal modes that grow exponentially, concluding that the Burnett equations are linearly unstable. We have partially extended his analysis, originally made for Maxwellian molecules, for any interaction potential and argue that his results can be reinterpreted as to give a bound for the Knudsen number above which the Burnett equations are not valid.
36 citations
36 citations
TL;DR: In this article, a model gas separator composed of two Knudsen pumps is fabricated, which has 27 cm2 total membrane area and induces 5-6% difference of mole percentage between two product gases under the flow rate 5 sccm of the feed gas.
36 citations
TL;DR: The presented layout facilitates both the measurement of effusion rates under ultrahigh vacuum conditions without the need for a separate experimental setup and the growth of surface supported molecular layers and nanostructures.
Abstract: We describe a straightforward, reliable, and inexpensive design of a Knudsen type molecular effusion cell capable of measuring molecular evaporation rates in situ. This is accomplished by means of a quartz crystal microbalance integrated into the shutter of the effusion cell. The presented layout facilitates both the measurement of effusion rates under ultrahigh vacuum conditions without the need for a separate experimental setup and the growth of surface supported molecular layers and nanostructures. As an important prerequisite for reproducible deposition of molecular films with defined coverages ranging from submonolayers up to multilayers, the Knudsen cell features a stable deposition rate for crucible temperatures between 50 and 500 °C. Experimental determination of deposition rates for different crucible temperatures allows to approximate sublimation enthalpies of the evaporant based on the Clausius–Clapeyron equation.
36 citations
TL;DR: In this article, a relaxation method on Burnett terms is proposed to simulate the compressible gas flow and heat transfer in micro Poiseuille flow in the slip and transition flow regime.
36 citations