Abstract
In this paper, the user-defined function (UDF) is firstly used to couple the porous medium model and the Euler–Euler two-fluid model, and the integrated SEN clogging model including the SEN clogging formation and growth, and liquid steel fluid flow dominated by the deposition of non-metallic inclusion particles is established. The simulation results of the SEN clogging under the Euler–Euler and Euler–Lagrange frameworks are both in good agreement with the measured results. With the increase of the distance from the nozzle inlet, the clogging thickness first increases, then remains stable, and slightly decreases. The clogging at the bottom of the nozzle is most serious and presents a conical shape. The polyhedral mesh is better than that of the hexahedral structure mesh for SEN clogging simulation. With the flow space of molten steel extruded and clogged, the molten steel jet is concentrated and strengthened under the constant steel throughput. The average inclination angle of molten steel jet from the nozzle side port first increases and then decreases slightly with time. The volume fraction of the clogging increases rapidly at first, and then the growth rate of the clogging decreases.
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Abbreviations
- \(K = {\text{L}},{\text{S}}\) :
-
Liquid phase and solid phase, respectively, (–)
- \(\alpha_{K}\) :
-
Volume fraction, (–)
- \(\rho\) :
-
Density, (kg/m3)
- \(\overrightarrow {u}_{K}\) :
-
Velocity vector, (m/s)
- \(t\) :
-
Time, (s)
- \(\tau_{K}\) :
-
Shear pressure, (Pa)
- \(p\) :
-
Pressure, (Pa)
- \(\overrightarrow {g}\) :
-
Acceleration of gravity, (m/s2)
- \(F_{K}\) :
-
Interface force between two phases, (N)
- \(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}}{{S_{u} }}\) :
-
Darcy source terms of continuous phase velocity, (–)
- \(F_{{{\text{L}},K}}\) :
-
Lift force, (N)
- \(F_{{{\text{D}},K}}\) :
-
Drag force, (N)
- \(F_{{{\text{V}},K}}\) :
-
Virtual mass force, (N)
- \(F_{{{\text{td}},K}}\) :
-
Turbulent dispersion force, (N)
- \({\text{I}}\) :
-
Unit tensor, (–)
- \(\mu_{{{\text{eff}},K}}\) :
-
Effective viscosity, (Pa s)
- \(\mu_{{\text{L}}}\) :
-
Molecular viscosity, (Pa s)
- \(\mu_{{\text{T}}}\) :
-
Turbulent viscosity, (Pa s)
- \(\mu_{{{\text{BI}}}}\) :
-
Equivalent viscosity, (Pa s)
- \(G_{k}\) :
-
Production terms of \(k\), (–)
- \(G_{\omega }\) :
-
Production terms of \(\omega\), (–)
- \(\Gamma_{k}\) :
-
Equivalent diffusivity of \(k\), (–)
- \(\Gamma_{\omega }\) :
-
Equivalent diffusivity of \(\omega\), (–)
- \(k\) :
-
Turbulent kinetic energy, (–)
- \(\omega\) :
-
Specific dissipation rate, (–)
- \(Y_{k}\) :
-
Turbulent dissipation term of \(k\), (–)
- \(Y_{\omega }\) :
-
Turbulent dissipation term of \(\omega\), (–)
- \(S_{k}\) :
-
Source terms of \(k\), (–)
- \(S_{\omega }\) :
-
Source terms of \(k\), (–)
- \(G_{b}\) :
-
Buoyancy terms of \(k\), (–)
- \(G_{\omega b}\) :
-
Buoyancy terms of \(\omega\), (–)
- \(F_{{\text{A}}}\) :
-
Adhesion force, (N)
- \(F_{{\text{B}}}\) :
-
Buoyancy force, (N)
- \(\kappa_{{\text{S}}}\) :
-
Friction coefficient, (–)
- \(r_{1}\) :
-
Particle radius, (m)
- \(a\) :
-
Contact radius, (m)
- \(R_{{\text{N}}}\) :
-
Normal ratio, (–)
- \(R_{{\text{P}}}\) :
-
Parallel ratio, (–)
- \(R_{{\text{T}}}\) :
-
Torque ratio, (–)
- \(K_{{{\text{per}}}}\) :
-
Permeability, (–)
- \(\overline{{f_{{\text{p}}} }}\) :
-
Average solid volume fraction of the clog, (–)
- \(D_{{{\text{pore}}}}\) :
-
Diameter of the large hole in the clog, (m)
- \(f_{{{\text{clog}}}}\) :
-
Volume fraction of clog in the cell, (–)
- \(f_{{\text{p}}}\) :
-
The volume fractions of solid phase, (–)
- \(S_{k}\) :
-
Darcy source terms of turbulent kinetic energy, (–)
- \(S_{\omega }\) :
-
Darcy source terms of specific dissipation rate, (–)
- \(F_{{\text{P}}}\) :
-
Pressure gradient force, (N)
- \(F_{{\text{g}}}\) :
-
Gravity, (N)
- \(m_{{\text{b}}}\) :
-
Mass of discrete particles, (kg)
- \(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}}{{u_{{\text{b}}} }}\) :
-
Velocity of discrete particles, (m/s)
- \(C_{{\text{D}}}\) :
-
Drag force coefficients, (–)
- \(C_{{\text{L}}}\) :
-
Lift force coefficients, (–)
- \(C_{{\text{V}}}\) :
-
Virtual mass force coefficients, (–)
- \(d_{{\text{b}}}\) :
-
Diameter of discrete particles, (m)
- \(\rho_{{\text{b}}}\) :
-
Density of discrete particles, (kg/m3)
- \(\overrightarrow {{u^{\prime}}}\) :
-
Time averaged velocity, (m/s)
- \(\xi\) :
-
Gaussian distributed random number, (m/s)
- \(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}}{{u_{{{\text{in}}}} }}\) :
-
Average velocity of the inclusion at this point and time, (m/s)
- \(u_{{{\text{nor}}}}\) :
-
Velocity projection of \(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}}{{u_{{{\text{in}}}} }}\) in the normal direction of the plane, (m/s)
- Φ(·):
-
Cumulative distribution function of the standard normal distribution, (–)
- Ψ(·):
-
Density function of the standard normal distribution, (–)
- \(\Delta f_{{\text{p}}}\) :
-
Cumulative distribution function of the standard normal distribution, (–)
- S :
-
Area of the mesh surface, (m2)
- \(c_{inclusion}\) :
-
Inclusion concentration, (–)
- \(\Delta t\) :
-
Time step, (s)
- \(V_{{{\text{cell}}}}\) :
-
The mesh volume, (m3)
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (U1960202).
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Liu, JQ., Liu, YB., Sun, Q. et al. Numerical Simulation of Transient Submerged Entry Nozzle Clogging With Euler–Euler and Euler–Lagrange Frameworks. Metall Mater Trans B 54, 2629–2650 (2023). https://doi.org/10.1007/s11663-023-02863-9
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DOI: https://doi.org/10.1007/s11663-023-02863-9