Some effects of finite particle volume on the dynamics of gas-particle mixtures

Rudinger, George

doi:10.2514/3.3112

Cited by 140 publications

(34 citation statements)

References 11 publications

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“…It was also noted [4] that the presence of a gas interlayer between the porous screen and the wall may reduce the amplitude of pressure on the solid wall. The theoretical description of dynamic interaction of shock waves with a solid wall screened by a readily compressible porous material in [4,6] is based on the model of an "effective" gas [7,8], where a twophase medium is considered as a thermodynamically equilibrium homogeneous mixture of gaseous and condensed phases. This simplified model of a two-phase medium was demonstrated [4,6,9,10] to be valid only for the description of the stage of dynamic compression of strongly compressible materials behind shock waves of moderate intensity reflected from the wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the transfer of shock-wave loading to a screened flat wall through a layer of a powdered medium and a subsequent air gap

Boldyreva

Губайдуллин

Дудко

et al. 2007

Combust Explos Shock Waves

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The two-velocity, two-temperature model with two stresses in a mixture of a gas and solid particles contacting each other is used to numerically study the dynamic effect of an air shock wave incoming onto a solid wall with a screening layer of a porous powdered medium at some distance from the wall. The process is described for the case of one-dimensional planar motion of the gaseous and disperse phases under the assumption of a viscoelastic behavior of the powder skeleton. The effect of stepwise shock waves onto the porous powdered screen is considered. The influence of parameters of the screening layer and the air gap on the dynamics of loading of the screened solid wall is analyzed.

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Section: Introductionmentioning

confidence: 99%

Numerical study of the transfer of shock-wave loading to a screened flat wall through a layer of a powdered medium and a subsequent air gap

Boldyreva

Губайдуллин

Дудко

et al. 2007

Combust Explos Shock Waves

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“…In such cases the volume fraction is of order 10 4 and the assumption of negligible volume fraction is well justiÿed. But at the high gas densities (high pressure) and at high particle mass fraction, the volume fraction of the particles, will be su ciently large so that the volume fraction should not have been neglected as suggested by Rudinger [9].…”

Section: Mathematical Formulation Of the Modelmentioning

confidence: 99%

Laminar diffusion of suspended particulate matter using a two phase flow model

Panda

Mishra

Panda

2002

Numerical Methods in Fluids

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SUMMARYThe present paper envisages laminar mixing of a two-dimensional jet of particulate suspension in an incompressible carrier uid with a free stream in direction of the jet axis. Finite di erence technique has been employed for ÿnding out solution of governing equations. It is found that the di usion parameter , the ratio of particle di usion coe cient and kinematic viscosity of the carrier uid, have signiÿcant in uence on the concentration of particles. A large value of has the e ect in increasing the perturbation velocity up and perturbation density p. It is observed that the volume fraction ', has no signiÿcant e ect on perturbation velocity u and up but has profound e ect on perturbation velocity v and vp. It is also found that the particle phase as well as the carrier uid velocity attain free stream value for the large , the modiÿed x-co-ordinate. Further the magnitude of the perturbation quantities u; up; v; vp decreases as increases i.e. at far away from the nozzle exit.

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“…This assumption is justified when studying sufficiently large particles (diameter > t0 -2 pm) in relatively small quantities (Rudinger 1965;Levine and Otterman 1975). The different interaction terms in H are modeled as follows: Drag force:…”

Section: ~I the Mathematical Modelmentioning

confidence: 99%

Optimization of a pyrotechnic igniter with the release of reactive particles

1991

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Abstract. This paper deals with the effects of reactive particles on the performance of a pyrotechnic igniter. These particles are placed on the inner surface of a 'Gash tube", released into the main flow of the gas and ignited by the passage of one of the two discontinuities (the shock wave or the contact surface). Two particle sizes have been studied (3pro and 10#m). It is shown that the best performance is achieved with small particles released into the flow by the shock wave. Another focal point of this study is the combining of two fundamentally different methods to calculate the two phase flow.

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Some effects of finite particle volume on the dynamics of gas-particle mixtures

Cited by 140 publications

References 11 publications

Numerical study of the transfer of shock-wave loading to a screened flat wall through a layer of a powdered medium and a subsequent air gap

Numerical study of the transfer of shock-wave loading to a screened flat wall through a layer of a powdered medium and a subsequent air gap

Laminar diffusion of suspended particulate matter using a two phase flow model

Optimization of a pyrotechnic igniter with the release of reactive particles

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