Introduction

Bojarevics, Valdis; Freibergs, J. A.; Shilova, E. I.; Shcherbinin, E.V.

doi:10.1007/978-94-009-1163-5_1

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…To describe Lorentz force induced by an electropulsing and its driven convection, the S parameter that can be taken as the characteristic non-dimensional parameter is given as [34,35]:S=μ0I24π2ρυ2, where I is the current intensity, which is the product of the current density j and cross-section area s , ν is the kinematic viscosity, ρ is the density of the liquid metal and μ 0 is the vacuum permeability. Although the value of S can characterize the relative intensity of the flow, it is not feasible to analyze the melt flow regime utilizing the value of S as a criterion.…”

Section: Resultsmentioning

confidence: 99%

The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing

Zhang

et al. 2019

Materials

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An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.

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Section: Resultsmentioning

confidence: 99%

The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing

Zhang

et al. 2019

Materials

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“…To find the optimal shape of the nozzle sidewall, schematically shown by part 2 in Figure , and to estimate the width and velocity of the trough-flow (TF), we utilize the theory of swirling conically similar jets. − Conical similarity is a feature, which allows for obtaining a wide family of analytical solutions to the Navier–Stokes, heat, diffusion, and magneto-hydrodynamic equations . This family includes planar vortex-sink and Jeffery–Hamel flows, , swirl-free jets, ,,, swirling jets, ,,,, Marangoni convection, free convection, electro-vortex flows, and many others …”

Section: Theory Of Conically Similar Jetsmentioning

confidence: 99%

Novel Annular Jet Vortex Reactor for High-Temperature Thermochemical Conversion of Hydrocarbons to Acetylene

et al. 2022

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This paper describes a novel reactor for acetylene synthesis by high-temperature thermochemical conversion of paraffin hydrocarbons. The reactor utilizes a conical annular swirling jet, which becomes extremely thin as swirl intensifies. The small thickness provides fast mass, momentum, and heat transfer to facilitate the rapid heating and conversion of the reactants. We employ a unique wall shape for the converging–diverging combustion zone, which maintains relatively low reactor wall temperature and avoids the need for external cooling. The wall shape and angle were derived from an approximate analytical solution of the Navier–Stokes and energy equations, which leads to the maximal jet flow rate and avoids wall separation under extreme high swirling flow conditions. The analytical solution predicts a high-speed swirling flow, which includes a thin annular conical diverging jet where mass, momentum, and heat fluxes concentrate, and chemical reactions can occur rapidly. Across the jet, the temperature sharply drops from its large near-axis value to its small near-wall value. We illustrate and study these features with the help of numerical simulations of the Navier–Stokes, energy, and species equations and proof-of-concept experiments. The experiments confirm the thin annular conical shape of the flame, which is blue, transparent, and well anchored near the throat. The present device produces a flow pattern, which minimizes the reactor wall temperature, while producing light olefins with high selectivity and conversion.

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Numerical modelling of electrovortex and heat flows in dc electric arc furnace with cooling bottom electrode

Kazak

2013

Heat Mass Transfer

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Introduction

Cited by 5 publications

References 11 publications

The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing

The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing

Novel Annular Jet Vortex Reactor for High-Temperature Thermochemical Conversion of Hydrocarbons to Acetylene

Numerical modelling of electrovortex and heat flows in dc electric arc furnace with cooling bottom electrode

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