Topic
Rarefaction
About: Rarefaction is a research topic. Over the lifetime, 1852 publications have been published within this topic receiving 26943 citations.
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TL;DR: In this paper, the vanishing viscosity limit for a general non-Newtonian compressible fluid in R d, d = 2, 3 was considered. And the result covers the particular case of a linearly viscous fluid governed by the Navier-Stokes system, where the initial data approach a profile determined by the Riemann data generating a planar rarefaction wave for the Euler system.
7 citations
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TL;DR: In this article, the effect of temperature on the quality factor (Q-factor) of a micro-beam resonator is analyzed in a wide range of gas rarefaction conditions (ambient pressure and accommodation coefficients (ACs)).
Abstract: In this study, the effect of temperature on the quality factor (Q-factor) of a micro-beam resonator is analyzed in a wide range of gas rarefaction conditions (ambient pressure and accommodation coefficients (ACs)). Squeeze film damping (SFD), thermoelastic damping (TED), and anchor loss, which are dominant damping mechanisms of micro-beam resonators, are included in the total Q-factor. The increase in the mean free path of gas with temperature is more significant than that of the gas viscosity in high gas rarefaction. Thus, the effect of temperature in gas rarefaction is discussed to improve the Q-factors of the resonators. The modified molecular gas lubrication (MMGL) equation is utilized to model SFD. Dynamic viscosity and Poiseuille flow rate are used to modify the MMGL equation considering the coupled effects of temperature and gas rarefaction. Finally, the effect of temperature on the Q-factors is discussed under various gas rarefaction conditions (pressure and ACs), types of gases and resonator modes. The results show that the Q-factor increases with temperature in higher gas rarefaction (lower pressure and ACs), whereas the Q-factor decreases as temperature increases in lower gas rarefaction (higher pressure and ACs). The decrease in the Q-factor with temperature is improved by the gas rarefaction effect. Furthermore, the Q-factor of a micro-beam resonator increases considerably with temperature by using hydrogen in higher gas rarefaction and the 1st mode of the resonator.
7 citations
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TL;DR: In a micro tube, the flow and thermal fields have very different features to the conventional tube flows as mentioned in this paper, such as compressibility, viscous dissipation, and rarefaction.
Abstract: In a microtube, the flow and thermal fields have very different features to the conventional tube flows. Fluid properties such as compressibility, viscous dissipation, and rarefaction are important...
7 citations
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TL;DR: In this article, the propagation of two-component mixtures of materials of sharply different densities is investigated experimentally and anomalies associated with relaxation to hydrodynamic equilibrium behind the shock front are observed.
Abstract: The propagation of shock waves in two-component mixtures of materials of sharply different densities is investigated experimentally. Anomalies associated with relaxation to hydrodynamic equilibrium behind the shock front are observed. The shock wave is observed to smear, depending on the ratios between the compressibilities and densities of the components, the volumetric content and dis ~ persity of particles of the heavier component, and the viscosity of the lighter component.
7 citations
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TL;DR: In this paper, the outflow of high pressure liquid (in particular, water) to the atmosphere from a closed tube (of length a few metres and diameter more than a few centimetres) because of sudden destruction of one bottom is theoretically investigated.
7 citations