On the evolution of magnetic shock wave in the mixture of gas and small solid dust particles

2022 ◽  
Author(s):  
Pooja Gupta ◽  
L.P. Singh
Keyword(s):  
Shock Wave ◽  
Dust Particles

Development of the flow induced by a piston moving impulsively in a dusty gas

1985 ◽  
Vol 397 (1813) ◽  
pp. 295-309 ◽  
Keyword(s):  
Shock Wave ◽  
Equations Of Motion ◽  
Wave Structure ◽  
Elastic Collision ◽  
Dust Particles ◽  
Dusty Gas ◽  
Impulsive Motion ◽  
Dependent Change ◽  
Piston Speed ◽  
Time Dependent Change

The flow resulting from the impulsive motion of a piston moving at constant speed in a dusty gas is studied analytically and numerically. An idealized equilibrium-gas approximation is used to discuss the effects of piston speed and mass concentration of dust particles on the eventually formed shock wave. The detailed time-dependent change of the flow structure is studied by solving the equations of motion numerically. A partly dispersed shock-wave structure is formed at a high piston speed and a fully dispersed shock at a low piston speed. Two situations are considered, where the particles striking the piston experience an elastic collision, or where they stick to its surface. Significant effects on the flow produced by particles that reflect from the piston surface are discussed and clarified.

Shock Wave Propagation Into a Dust-Gas Suspension Inside a Double-Bend Conduit

2002 ◽  
Vol 124 (2) ◽  
pp. 483-491 ◽  
Author(s):  
O. Igra ◽  
X. Wu ◽  
G. Q. Hu ◽  
J. Falcovitz
Keyword(s):  
Shock Wave ◽  
Wave Attenuation ◽  
Numerical Study ◽  
Effective Means ◽  
Solid Particles ◽  
Dust Particles ◽  
Mass Loading ◽  
Shock Attenuation ◽  
Dust Mass ◽  
Transmitted Shock Wave

Using conduits in which a transmitted shock wave experiences abrupt changes in its direction of propagation is an effective means for shock wave attenuation. An additional attenuation of the transmitted shock wave is obtained when the medium contained inside the conduit (through which the shock wave is transmitted) is a suspension rather than a pure gas. The present numerical study shows that adding small solid particles (dust) into the gaseous phase results in sharp attenuation of all shock waves passing through the conduit. It is shown that the smaller the dust particles diameter is, the higher the shock attenuation becomes. Increasing the dust mass loading in the suspension also causes a quick attenuation. By proper choice of dust mass loading in the suspension, or the particles diameter, it is possible to ensure that the emerging wave from the conduit exit channel is a (smooth) compression wave, rather than a shock wave.

scholarly journals Interaction of waves in one-dimensional dusty gas flow

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Pooja Gupta ◽  
Rahul Kumar Chaturvedi ◽  
L. P. Singh
Keyword(s):  
Shock Wave ◽  
High Frequency ◽  
Gas Flow ◽  
Ideal Gas ◽  
Transport Equations ◽  
Dust Particles ◽  
Multiple Time Scales ◽  
Dusty Gas ◽  
One Dimensional ◽  
Geometrical Acoustics

AbstractThe present study uses the theory of weakly nonlinear geometrical acoustics to derive the high-frequency small amplitude asymptotic solution of the one-dimensional quasilinear hyperbolic system of partial differential equations characterizing compressible, unsteady flow with generalized geometry in ideal gas flow with dust particles. The method of multiple time scales is applied to derive the transport equations for the amplitude of resonantly interacting high-frequency waves in a dusty gas. These transport equations are used for the qualitative analysis of nonlinear wave interaction process and self-interaction of nonlinear waves which exist in the system under study. Further, the evolutionary behavior of weak shock waves propagating in ideal gas flow with dust particles is examined here. The progressive wave nature of nonresonant waves terminating into the shock wave and its location is also studied. Further, we analyze the effect of the small solid particles on the propagation of shock wave.

scholarly journals A comparison of contact charging and impact ionization in low-velocity impacts: implications for dust detection in space

2021 ◽  
Vol 39 (3) ◽  
pp. 533-548
Author(s):  
Tarjei Antonsen ◽  
Ingrid Mann ◽  
Jakub Vaverka ◽  
Libor Nouzak ◽  
Åshild Fredriksen
Keyword(s):  
Shock Wave ◽  
Impact Ionization ◽  
Dust Particles ◽  
Low Velocity ◽  
Direct Ionization ◽  
Contact Charging ◽  
Naturally Occurring ◽  
Metal Metal ◽  
Dust Detection ◽  
Volume Ionization

Abstract. We investigate the generation of charge due to collision between projectiles with sizes below ∼1 µm and metal surfaces at speeds ∼0.1 to 10 km s−1. This corresponds to speeds above the elastic limit and well below speeds where volume ionization can occur. Impact charge production at these low to intermediate speeds has traditionally been described by invoking the theory of shock wave ionization. By looking at the thermodynamics of the low-velocity solution of shock wave ionization, we find that such a mechanism alone is not sufficient to account for the recorded charge production in a number of scenarios in the laboratory and in space. We propose a model of capacitive contact charging that involves no direct ionization, in which we allow for projectile fragmentation upon impact. Furthermore, we show that this model describes measurements of metal–metal impacts in the laboratory well. We also address contact charging in the context of ice-on-metal collisions and apply our results to rocket observations of mesospheric dust. In general, we find that contact charging dominates at speeds of up to a few kilometres per second and complements shock wave ionization up to speeds where direct ionization can take place. The conditions that we consider can be applied to dust particles naturally occurring in space and in Earth's upper atmosphere and their direct impacts on rockets, spacecraft, and impacts of secondary ejecta.

scholarly journals Crystallization of Silicate Particles By Shock Waves

2005 ◽  
Vol 13 ◽  
pp. 525-527 ◽  
Author(s):  
Taishi Nakamoto ◽  
Hitoshi Miura
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Solar Nebula ◽  
Shock Velocity ◽  
Dust Particles ◽  
The Sun ◽  
Gas Density ◽  
Heating Mechanism ◽  
Wave Heating

AbstractCrystalline silicate dust particles have been found in some comets, though progenitors of those dust particles are thought to be amorphous. Here, the origin of the crystalline particles was investigated based on the shock-wave heating mechanism. We find that appropriate shock waves can crystallize amorphous dust particles and conditions of these shock waves (shock velocity and pre-shock gas density) are clarified.The gas density in the solar nebula and the shock velocity that may be induced in comet forming regions by some mechanisms were discussed. It was suggested that comets formed in a region closer than about 20 AU to the Sun can contain the crystalline particles, whereas comets formed in a further region can hardly have them.

Effect of solid dust particles on the propagation of shock wave in planar and non-planar gasdynamics

2020 ◽  
Vol 65 ◽  
pp. 114-122
Author(s):  
Rahul Kumar Chaturvedi ◽  
Shobhit Kumar Srivastava ◽  
L.P. Singh
Keyword(s):  
Shock Wave ◽  
Dust Particles

scholarly journals Подъем пылевых частиц при воздействии лазерного излучения на хондритовую мишень и возможность моделирования плазменно-пылевых процессов у поверхности Луны

2020 ◽  
Vol 46 (20) ◽  
pp. 47
Author(s):  
И.Н. Бурдонский ◽  
А.Г. Леонов ◽  
В.Н. Юфа ◽  
А.П. Голубь ◽  
С.И. Попель ◽  
...  
Keyword(s):  
Shock Wave ◽  
Laser Radiation ◽  
Fine Particles ◽  
Target Surface ◽  
Experimental Modeling ◽  
Dust Particles ◽  
The Moon ◽  
Elastic Deformations ◽  
Linear Elastic ◽  
The Impact

The results of the first study on experimental modeling of the rise of dust particles by a shock wave above a target surface, performed on the Saturn installation, are presented. The interaction of laser radiation with a porous chondritic target, the surface of which contains fine particles of talc, is investigated. The results of experimental modeling can be used to describe the rise of dust particles from zones of nonlinear and linear elastic deformations of the regolith material, which characterize the impact of the meteoroid on the surface of the Moon.

Mars surface dust activation at small meteoroid’s impacts

2021 ◽  
Author(s):  
Boris Ivanov
Keyword(s):  
Shock Wave ◽  
Negative Pressure ◽  
Current Model ◽  
Wave Length ◽  
Minimum Energy ◽  
Dust Particles ◽  
Dust Devils ◽  
Air Blast ◽  
Impact Site ◽  
The Impact

<p>We continue the analysis of HiRISE high resolution images of Mars to understand properties of dust covering the surface. The data on dust devils observed with Mars landers and surface traces of dust devils could be expanded with elongated albedo features imaged near “new” impact sites (“new” means that we have orbital images before and after the meteoroid impact, which give us an estimate of the impact date and the age of a feature). The age of these features is from 0.5 to 12 terrestrial years. From geometric reasons we could assume that the most possible mechanism of this elongated albedo details is the “footprint” of two or more colliding air shock waves, generated at the impact site. Of ~1200 “new” impacts known today, in 18 cases crater pairs or clusters, created with fragments of the same “parent” meteoroid, we recognize 24 thin “parabolas” with a width of 1 to 10 m (0.2 to 10 main crater diameters, <em>D</em>), extended to 100 – 400 m (3 to 100 <em>D</em>) from the impact site. In ~30 cases near a single crater we observe a curved albedo feature nick-named “scimitar”. These features have width, growing with a distance from the impact point. The length varies from 10 to 100 <em>D</em>, the width varies from 1 to 10 <em>D</em>. Our working hypothesis is that “scimitars” are footprints of ballistic and spherical air shock wave collision at the surface. Both “parabolas” and “scimitars” have an exact bilateral symmetry, which allows us to reconstruct the flight direction of projectiles.</p><p>We estimate the equivalent energy of spherical air blasts with two different assumptions for “parabolas” and “scimitars” formation. For parabolas we assume a mechanism, similar to dust devil track formation – the negative pressure excurse uplifts the upper fine dust layer. The main assumption is that the dark parabolic strip width corresponds the wave length of the negative pressure phase in the air shock wave. It gives us the minimum energy estimate as in reality the negative phase could be longer. The negative pressures here along the parabola length decay from about 10 to 5 Pa with the phase duration of a few milliseconds. Such a suction pulse is able to mobilize dust particles 50 to 100 microns in size.</p><p>For scimitars, which in contrast to “dark” parabolas are typically “brighter” than surrounding area, we have no a good mechanical explanation of origin. However, with limits of our current model, the spherical “explosion” air blast should be enough energetic, to overrun the ballistic shock wave. From non-linear motion of the shock wave front we can estimate the fraction of meteoroid’s kinetic energy, converted to the air blast energy. The model is able to reproduce approximately the scimitar’s curvature.</p>

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