Journal of Sustainable Metallurgy

, Volume 5, Issue 2, pp 195–203 | Cite as

CFD Modeling of Melt Spreading Behavior on Spinning Discs and Cups for Centrifugal Granulation of Molten Slag

  • Yuhua PanEmail author
  • Ming Zhao
  • Ping Ma
  • Jing Li
  • Zhaoyi Huo
  • Hongyu Li
Thematic Section: Slag Granulation
Part of the following topical collections:
  1. Slag Granulation


The spreading behaviors of molten slag on spinning discs and cups were studied through performing free surface flow numerical simulations by means of computational fluid dynamics (CFD) modeling technique. In this work, liquid slag film thickness at the edge of the spinning discs and cups was predicted by using the CFD model, since the slag film thickness has a predominant influence on the size of the slag granules produced after the slag film breakup. The effects of the shape of discs and cups and the operating conditions (slag flowrate and spinning speed) on the slag film thickness were examined. Flat surface disc, disc with curved surface, and cups with different sidewall height and taper angle were investigated. It was found from the modeling results that, under the same slag flowrate and spinning speed, the larger the wetting area of the slag on the discs and cups, the smaller the slag film thickness. For the same size (radius) discs and cups, the slag film thickness on the flat surface disc is larger than those on the cup and the curved surface disc. Furthermore, the film thickness on the cup is larger than that on the curved surface disc. The reason is that the cup has a sharp corner and a sidewall that impose a larger resistance to the slag flow, whereas the curved surface disc has a smooth surface that has a smaller resistance to the slag flow.


Centrifugal granulation Spinning disc Spinning cup Molten slag Film thickness Free surface flow 


Alphabetic Symbols


Constant in turbulence model


Body force vector


First blending function in turbulence model


Depth of curved surface disc and cup


Turbulence kinetic energy


Total number of fluid phases (Np = 2 for liquid slag and air)




Production rate of turbulence kinetic energy


Volume fraction


Radius of disc and cup


Velocity vector

Greek Symbols


Constant in turbulence model


Constant in turbulence model


Constant in turbulence model


Dissipation rate of turbulence kinetic energy


Local curvature of free surface


Dynamic viscosity


Turbulent viscosity


Taper angle of cup sidewall




Prandtl number for ω in transformed k-ε model


Prandtl number for ω in SST turbulence model


Prandtl number for k in SST turbulence model


Turbulence eddy frequency



Fluid phase identity (liquid slag or air)


Gas phase or gravitational force


Liquid phase


Surface tension force



The present work was financially supported by Education Department of Liaoning Province (Grant No.: 2017LNQN17), China, and University of Science and Technology Liaoning (Grant No.: 2016QN19), China.


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.School of Materials and MetallurgyUniversity of Science and Technology LiaoningAnshanChina

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