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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9 citations
30 Jul 1990
TL;DR: In this paper, the authors studied heterogeneous condensation and evaporation induced by an unsteady rarefaction wave and by the passage of a shock wave in a water-nitrogen mixture.
Abstract: Heterogeneous condensation and evaporation induced by an unsteady rarefaction wave and by the passage of a shock wave in a water‐nitrogen mixture is studied. Time resolved measurements of modal droplet radius, droplets radius, droplet number density, pressure, and gas density are presented. Condensation on Cr2O3‐particles of about 10 nm starts at a saturation ratio of 3.4. Typical droplet radii and droplet number densities are 1.5 μm and 1011 m−3. A shock wave with Mach number 1.36 causes full evaporation in 4 ms.
9 citations
TL;DR: In this article, the long-time evolution of pulses in the Korteweg-de Vries equation theory for initial distributions which produce no soliton but instead lead to the formation of a dispersive shock wave and of a rarefaction wave is considered.
Abstract: We consider the long-time evolution of pulses in the Korteweg-de Vries equation theory for initial distributions which produce no soliton but instead lead to the formation of a dispersive shock wave and of a rarefaction wave. An approach based on Whitham modulation theory makes it possible to obtain an analytic description of the structure and to describe its self-similar behavior near the soliton edge of the shock. The results are compared with numerical simulations.
9 citations
TL;DR: By means of molecular dynamics simulation, this article investigated the interaction of picosecond-duration compression pulses excited by a flat impactor with flat and nano-structured rear surfaces of copper and aluminum samples.
Abstract: By means of molecular dynamics simulation, we investigate the interaction of picosecond-duration compression pulses excited by a flat impactor with flat and nano-structured rear surfaces of copper and aluminum samples It is shown that protrusions on the rear surface can increase the threshold value of the impact velocity, leading to spallation As the shock wave reaches the perturbed rear surface, an unloading on the lateral surfaces of the protrusions begins; it leads to an intensive plastic deformation in the surface layer of metal A part of the compression pulse energy is spent on the plastic deformation that restricts the rarefaction wave amplitude and suppresses the spall fracture An increase in threshold velocity can be observed for all investigated thicknesses of the targets The increase is substantial with respect to comparability between the protrusion height and the compression pulse width (the impactor thickness) Another condition is the ratio of the protrusion cross-section to the total s
9 citations
TL;DR: In this paper, a method is presented to calculate the steady flows of rarefied gaseous mixtures in networks of long channels, where the conservation of mass at the nodes of the network results into a system of linear algebraic equations.
Abstract: A method is presented to calculate the steady flows of rarefied gaseous mixtures in networks of long channels. The approach is based on the kinetic level. First, the McCormack linearized kinetic model is solved to obtain the local flow properties in the channels in a wide range of gaseous rarefaction and mole fraction. Second, the global flow properties including the flow rates and the distribution of the pressure and the mole fraction are deduced. An integral equation is introduced in order to determine the flow rates as functions of the differences of the partial pressures between the two ends of each channel. The conservation of mass at the nodes of the network results into a system of linear algebraic equations. The overall mathematical problem is solved iteratively. Pressure driven flows of He/Xe and He/Ar through an example network of circular tubes are calculated at intermediate values of the gaseous rarefaction. The results of the flow rates and the pressures and the mole fractions at the nodes in the whole system and the representative distributions of the pressure and the mole fraction along the channels are presented and commented on.
9 citations