Stabilizing effect of plasma discharge on bubbling fluidized granular bed

Hu, Mao-Bin; Dang, Sai-Chao; Ma, Qiang; Xia, Weidong

doi:10.1088/1674-1056/24/7/074502

Chinese Phys. B

2015

DOI: 10.1088/1674-1056/24/7/074502

|View full text |Cite

Stabilizing effect of plasma discharge on bubbling fluidized granular bed

Mao-Bin Hu¹,

Sai-Chao Dang²,

Qiang Ma³

et al.

Abstract: Fluidized beds have been widely used for processing granular materials. In this paper, we study the effect of plasma on the fluidization behavior of a bubbling fluidized bed with an atmospheric pressure plasma discharger. Experiment results show that the bubbling fluidized bed is stabilized with the discharge of plasma. When the discharge current reaches a minimum stabilization current Cms, air bubbles in the bed will disappear and the surface fluctuation is completely suppressed. A simplified model is propose… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2016

Publication Types

Select...

Article2

Relationship

Self Cite0

Independent2

Authors

Journals

Cited by 2 publications

References 31 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

Numerical investigation on the influence of gas-particle two-way coupling to the shock fluid in the two-dimensional Lagrangian framework

Chen¹,

Hai-Quan²,

Wang³

et al. 2016

Acta Phys. Sin.

View full text Add to dashboard Cite

When an extreme shock wave releases from the free surface of the material, some high speed particulate matters will be ejected from the material body and enter into the background gas. This induced multiphase mixing phenomenon is known as the ejecta mixing. Ejecta mixing is one of the most important problems in the scope of inner explosive compression engineering, and it is also a frontier research subject of the impact dynamics, multiphase fluid dynamics, computational mathematics, etc. The properties of ejecta mixing have been investigated experimently and analytically for many years. However, the results of numerical simuliation are very rare. At present, the ejecta mixing study mainly focuses on the gas particle one-way coupling, that is, the interests of existing works are in the characteristics of the ejected particulate matter transport in the gas. In fact, after a large number of particles entering into the gas, the gas and the particles will interact with each other. So it is necessary to consider the feedback of particles to the gas. In this paper, the theoretical modeling of gas particle two-way coupling, the discrete algorithm of the mathematical model and the particle phase feedback effects on the gas shock wave propagation are investigated in the framework of Lagrangian coordinates. In order to obtain the details of ejecta movement, the particle trajectory model is chosen as the basic model, and then the governing equations including interactions between gas phase and particle phase are derived. For giving the specific calculation formula, the physical meanings of the coupled interaction source terms in the Lagrangian framework are analyzed and a stable numerical scheme is given based on the staggered strategy. We also devise two different computing models of ejecta mixing, the planar and the column configurations, and then the numerical simulations are carried out. The phenomenon of gas shock speed acceleration caused by particle feedback is found, and the distributions of the physical quantities, such as density, velocity, specific internal energy, pressure, in the gas area are changed. Especially for the convergent configuration, the feedback effects will be amplified further by the geometrical shrinkage, which may have a significant influence on the performance of the inner explosion compression, owing to the obvious uniformity variation of the gas flow field and the gas shock rebound in advance. The mathematical model, the numerical method and the new physical findings in this paper, will provide an important theoretical support for the in-depth understanding of the ejecta mixing and also for the solving of the corresponding engineering application problems.

show abstract

Numerical investigation on the influence of gas-particle two-way coupling to the shock fluid in the two-dimensional Lagrangian framework

Chen¹,

Hai-Quan²,

Wang³

et al. 2016

Acta Phys. Sin.

View full text Add to dashboard Cite

show abstract

On modeling and physical laws of isentropic speed of sound in dense gas-particle two-phase compressible flows

Da-Wei¹,

Wang²,

Xi-Jun³

et al. 2016

Acta Phys. Sin.

View full text Add to dashboard Cite

Study of isentropic sound speed of two-phase or multiphase flow has theoretical significance and wide application background. As is well known, the speed of sound in fluid containing particles in suspension differs from that in the pure fluid. In the particular case of bubbly liquids (gas liquid two-phase flow), the researches find that the differences can be drastic. Up to now, the isentropic speed of sound in the flow field with a small volume fraction of bubbles (less than 1%), has been investigated fully both experimentally and theoretically. In this paper, we consider another situation, as the case with solid particles in gas, which is the so-called gas particle two-phase flow. Although many results have been obtained in gas liquid two-phase flow, there is still a lot of basic work to do due to the large differences in the flow structure and flow pattern between gas particle two-phase flow and gas liquid two-phase flow. Treating the gas particle suspension as the relaxed equilibrium, thermodynamic arguments are used to obtain the isentropic speed of sound. Unlike the existing work, we are dedicated to developing the computational model under dense condition. The space volume occupied by particle phase and the interaction between particles are overall considered, then a new formula of isentropic sound speed is derived. The new formula includes formulae of the pure gas flow and the already existing dilute gas particle two-phase flow as a special case. On the one hand, the correctness of our formula is verified. On the other hand, the new formula is more general. The variations of sound speed with different mass fractions of particle phase are analyzed. The theoretical calculation results show that the overall physical law of sound speed change is that with the increase of the particle mass fraction, the sound speed first decreases and then increases. The velocity of sound propagation in gas particle two-phase flow is far smaller than in pure gas in a wide range, so it is easy to reach the supersonic condition. When the particle volume fraction is below 10%, the result is consistent with Prandtl theoretical analysis. In this range, the influences of the particle phase pressure modeling parameters can be neglected. When the particle volume fraction is more than 10%, the particle phase pressure modeling parameters produce influences. Furthermore the corresponding physical principles and the mechanisms are discussed and revealed. The new formula and physical understandings obtained in this paper will provide a theoretical support for the researches of dense gas particle two-phase compressible flow and related engineering applications.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Stabilizing effect of plasma discharge on bubbling fluidized granular bed

Cited by 2 publications

References 31 publications

Numerical investigation on the influence of gas-particle two-way coupling to the shock fluid in the two-dimensional Lagrangian framework

Numerical investigation on the influence of gas-particle two-way coupling to the shock fluid in the two-dimensional Lagrangian framework

On modeling and physical laws of isentropic speed of sound in dense gas-particle two-phase compressible flows

Contact Info

Product

Resources

About