Calculation of confined gas-particle two-phase turbulent flows
01 Jan 1986-Vol. 24
TL;DR: In this paper, a two-phase turbulence closure model was used for gas-particle confined turbulent flows using Eulerian formulations of the transport equations and accounts for the combined effects of interphase slip and turbulent dispersion of particles.
Abstract: Numerical calculations have been carried out for gas-particle confined turbulent flows using a recently developed two-phase turbulence closure model. The present modeling scheme utilizes Eulerian formulations of the transport equations and accounts for the combined effects of interphase slip and turbulent dispersion of particles. A multiple-scale turbulence model is used for the turbulent field modeling of the underlying fluid flow. For the particle size and particle loading considered in this study, the fluid turbulence transport equations must be modified to include the damping effects of particles. Predictions and comparisons are made in the fully developed gas-solid pipe flow and the confined particle-laden jet. Numerical results are in reasonably good agreement with the published experimental information.
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TL;DR: In this article, a review of recent advances concerning analysis of dilute sprays and drop/turbulence interactions is presented, where a stochastic separated flow (SSF) method has been developed, which treat both finite interphase transport rates and dispersed phase (drop)/turbulent interactions using random-walk computations for the dispersed phase.
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TL;DR: In this paper, a model of gas-particle turbulent pipe flow which takes into account phase velocity slip, particle interaction with the wall and rotation of the particles is proposed, which is based on the use of the transport equations for the averaged flow parameters and the correlation moments describing the turbulent transfer of the momentum and angular momentum of the dispersed phase.
Abstract: A model of gas-particle turbulent pipe flow which takes into account phase velocity slip, particle interaction with the wall and rotation of the particles is proposed. Allowance for the Magnus force makes it possible to describe the intense transverse “skipping” motion of the particles and to obtain good agreement between the calculation results and the experimental data over a broad range of flow conditions. The model is based on the use of the transport equations for the averaged flow parameters and the correlation moments describing the turbulent transfer of the momentum and angular momentum of the dispersed phase.
3 citations
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TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.
11,866 citations
TL;DR: In this paper, a continuum mechanics approach to two-phase flow is reviewed and an averaging procedure is applied to the exact equations of motion, and the nature of the resulting equations is studied.
Abstract: : A continuum mechanics approach to two-phase flow is reviewed. An averaging procedure is discussed and applied to the exact equations of motion. Constitutive equations are supplied and discussed for the stresses, pressure differences and the interfacial force. The nature of the resulting equations is studied. (Author)
1,347 citations
1,080 citations
TL;DR: A description of recent spray evaporation and combustion models, taking into account turbulent two-and three-dimensional spray processes found in furnaces, gas turbine combustors, and internal combustion engines, is given in this paper.
747 citations
TL;DR: In this paper, a review dealing with a certain restricted portion of the mechanics of heterogeneous media is presented, where the problem of detailed transport processes between particles and gas may be treated independently of the complete dynamical problem, and this aspect, being a study of its own, will be suppressed to a considerable extent.
Abstract: This review deals with a certain restricted portion of the mechanics of heterogeneous media. The volume fraction of the solid-particle or droplet cloud is considered to be so small that the interaction between individual particles may be neglected or highly simplified. This limitation applies to the individual flow fields about the particles as well as to collisions, and to heat and mass transfer as well as to momentum exchange between phases. Under this circumstance, the problem of detailed transport processes between particles and gas may be treated independently of the complete dynamical problem, and this aspect, being a study of its own, will be suppressed to a considerable extent here. There are problems, such as the impact
of particles on walls, the concentration separation in boundary layers or pipe flow, in which the distortion of the particle flow field due to a solid wall or another particle is the central physical issue. These problems therefore lie outside the scope of the review. On the other hand, the structure of shock waves, sound attenuation, and many flow-field problems can be treated within our present restrictions. The basic equations and exchange processes will be introduced first, together with the physical parameters that indicate the relative importance of the particle cloud and the limitations of the dusty-gas concept. Then several different problems will be discussed that lead to some of the significant results in the field and illustrate analytical techniques that have proven useful.
652 citations