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, a laser-induced fluorescence technique was used to investigate sedimentation of concentrated (30% in volume) bidisperse suspensions using a 1:1 ratio.
10 citations
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TL;DR: In this article, the mass flow rate and the distributions of the pressure and the rarefaction parameter are deduced by the linearized Bhatnagar-Gross-Krook kinetic equation.
10 citations
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TL;DR: Gouin and Ruggeri as mentioned in this paper investigated the propagation of shock and rarefaction waves in a hyperbolic model of incompressible fluids and showed that the propagation is characterized by small jump in specific volume and temperature, even when the jump in pressure is relevant.
Abstract: The aim of the present paper is to investigate shock and rarefaction waves in a hyperbolic model of incompressible fluids. To this aim, we use the so-called extended-quasi-thermal-incompressible (EQTI) model, recently proposed by Gouin and Ruggeri (H. Gouin, T. Ruggeri, International Journal of Non-Linear Mechanics 47 (2012) 688–693). In particular, we use as constitutive equation a variant of the well-known Boussinesq approximation in which the specific volume depends not only on the temperature but also on the pressure, leading to a hyperbolic system of differential equations. The limit case of ideal incompressibility, namely when the thermal expansion coefficient and the compressibility factor vanish, is also considered. The results show that the propagation of shock waves in an EQTI fluid is characterized by small jump in specific volume and temperature, even when the jump in pressure is relevant, and rarefaction waves originating from a general Riemann problem are characterized by a very steep profile. The knowledge of the loci of the states that can be connected to a given state by a shock wave or a rarefaction wave allows also to completely solve the Riemann problem. The obtained results are confirmed by means of numerical calculations.
10 citations
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TL;DR: In this paper, the ionization kinetics of sodium diluted in argon are studied in a shock tube, in which the test gas mixture is ionized by a reflected shock wave and subsequently quenched by a strong rarefaction wave.
Abstract: The ionization kinetics of sodium diluted in argon is studied in a shock tube, in which the test gas mixture is ionized by a reflected shock wave and subsequently quenched by a strong rarefaction wave. A Langmuir electrostatic probe is used to monitor the variation of the ion number density at the reflection shock wave region. The working state of the probe is in the near free fall region and a correction for reduction of the probe current due to elastic scattering in the probe sheath is introduced. At the temperature range of 800 to 2600 K and in the ambience of argon gas, the three-body recombination rate coefficient of the sodium ion with electron is determined: 3.43×10-14T-3.77cm6s-1.
10 citations
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TL;DR: A single rarefaction wave having arbitrarily large strength is studied, connected with the stability of strictly hyperbolic systems of conservation laws in one space dimension.
Abstract: In this paper we study a number of algebraic conditions connected with the stability of strictly hyperbolic $n\times n$ systems of conservation laws in one space dimension: ut + f(u)x = 0 Such conditions yield existence and continuity of the flow of solutions in the vicinity of the reference solution Our main concern is a single rarefaction wave having arbitrarily large strength
10 citations