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Mean free path
About: Mean free path is a research topic. Over the lifetime, 4412 publications have been published within this topic receiving 114418 citations.
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TL;DR: In this paper, the authors analyzed the heat flow and temperature and density distributions in a rarefied gas between two parallel plates at rest with different uniform temperatures by a finite difference method where the collision term is computed direct numerically.
Abstract: Heat flow and temperature and density distributions in a rarefied gas between two parallel plates at rest with different uniform temperatures are analyzed numerically on the basis of the full nonlinear Boltzmann equation for hard‐sphere molecules and the Maxwell‐type boundary condition by a finite difference method where the collision term is computed direct numerically. The accurate results are presented for the case in the density measurement by Teagan and Springer [Phys. Fluids 11, 497 (1968)], where the temperature ratio is 1.326, the value of the accommodation coefficient is 0.826, and the ratio of mean free path to plate spacing (Knudsen number Kn) is 0.0658≤Kn≤0.7582. It is found that there is a considerable difference between the present density distribution and the experimental data. The reason for this discrepancy is also discussed. The accurate numerical results of the linearized problem are also presented for comparison.
68 citations
TL;DR: In this paper, the production/absorption rate of particles in compressed and heated asymmetric matter is studied using a Relativistic Mean Field (RMF) transport model with an isospin-dependent collision term.
68 citations
TL;DR: In this article, the attenuation of mechanical waves in single crystal quartz at low temperatures and at frequencies in the range 600 Mc/s to 1110 MC/s was measured, interpreted in terms of collisions between the low energy phonons, constituting the sound wave, and thermal phonons.
Abstract: The attenuation of mechanical waves in single crystal quartz at low temperatures and at frequencies in the range 600 Mc/s to 1110 Mc/s has been measured. The results are interpreted in terms of collisions between the low energy phonons, constituting the sound wave, and thermal phonons.
67 citations
TL;DR: Using molecular dynamics simulations, it is discovered that thermal conductivities of carbyne and cumulene at the quantum-corrected room temperature can exceed 54 and 148 kW/m/K, respectively, much higher than that for graphene.
Abstract: Ballistic Thermal Transport in Carbyne and Cumulene with Micron-Scale Spectral Acoustic Phonon Mean Free Path
67 citations
TL;DR: In this paper, the authors present a theoretical and experimental study on how thickness and microstructure affect the properties of Ag thin films, and they are able to successfully model the electrical resistivity and IR optical response using a thickness dependent electronic scattering time.
Abstract: The optical and electrical response of metal thin films approaching thicknesses in the range of the electron mean free path is highly affected by electronic scattering with the interfaces and defects. Here, we present a theoretical and experimental study on how thickness and microstructure affect the properties of Ag thin films. We are able to successfully model the electrical resistivity and IR optical response using a thickness dependent electronic scattering time. Remarkably, the product of electronic scattering time and resistivity remains constant regardless of the thickness (τx ρ = C), with a value of 59 ± 2 μΩ cm ⋅ fs for Ag films in the investigated range from 3 to 74 nm. Our findings enable us to develop a theoretically framework that allows calculating the optical response of metal thin films in the IR by using their measured thickness and resistivity. An excellent agreement is found between experimental measurements and predicted values. This study also shows the theoretical lower limit for emi...
67 citations