Abstract
Gas-solid mixing jet flows are an essential feature of typical chemical engineering processes. A proper analysis of the mixture flow optimizes process qualities and efficiencies. In this contribution, a numerical study of the solids dispersion in a two-phase jet flow is presented. The mathematical model treats the gas and the solid phases with an Eulerian approach. Radial profiles of the solid-phase mean velocity were computed on five axial levels, subdivided in five cases, in the mixing jet flow using a two-phase 3D computational fluid dynamics model. The computed solids velocities were compared with experimental data on a jet with an internal diameter of 12mm, at different inlet conditions of solid mass load for rates (3 to 7) and velocities (8 to 16m/s). The mean particle diameter used was 50μm and a density of 2500kg/m3.Three different drag models were applied to evaluate the solids dispersion, Wen and Yu [1], Gidaspow [2] and Massarani [3] correlations, the latter being a continuous one. The two-equation (k-e) turbulence model was employed to describe the gas-phase, while the zero-equation (kinematic viscosities analogy) turbulence model describing the solid-phase in a jet flow. The mathematical model predicts a developed flow regions similar to that found experimentally.
Highlights
Two-phase jet flows are extensively used in a variety of engineering application sectors; more precisely, fluid flows containing solid particles, such as chemical, pharmaceutical, healthcare, biomedical, fuel, personal products, minerals industries and new materials
A fundamental understanding of how particles interact with fluid flows is necessary to allow the use of computational fluid dynamics (CFD) models in the optimization and performance improvement of existing equipment and processes; the identification and solution of operating problems; the evaluation of retrofit options and the design of new equipment, systems and plants including process scale-up [4]
The dynamic behavior of a gas-solid jet is defined by the complex interaction between its individual phases
Summary
Two-phase jet flows are extensively used in a variety of engineering application sectors; more precisely, fluid flows containing solid particles, such as chemical, pharmaceutical, healthcare, biomedical, fuel, personal products, minerals industries and new materials. In all these applications, a fundamental understanding of how particles interact with fluid flows is necessary to allow the use of computational fluid dynamics (CFD) models in the optimization and performance improvement of existing equipment and processes; the identification and solution of operating problems; the evaluation of retrofit options and the design of new equipment, systems and plants including process scale-up [4]. Coherent structures are responsible for transport of significant mass, heat and momentum without being highly energetic, typical structures in shear flow are originated from some flow instabilities, mainly in the case of free shear layers (Decker et al [5])
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