Mathematical simulation of effects of flow control devices and buoyancy forces on molten steel flow and evolution of output temperatures in tundish

R. D. Morales, S. López-Ramírez, J. Palafox-Ramos, D. Zacharias

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The effects of flow control devices and buoyancy forces on the melt flow in a large tundish have been mathematically simulated using a k-ε turbulence model. Flow control devices included arrangements consisting of a pair of weirs and a pair of dams, a turbulence inhibitor and a pair of dams, and only a turbulence inhibitor. Buoyancy forces were simulated using step inputs of temperature and inputs of varying ladle stream temperature into the tundish. It was found that with inputs of hot steel, flow control devices improve performance by driving the melt upwards through the action of buoyancy forces. A bare tundish is less sensitive to buoyancy forces and shows greater thermal mixing than any other arrangement. Inputs of temperature steps promote higher temperature gradients of liquid steel inside the vessel than inputs of varying ladle stream temperature. A turbulence inhibitor delays the thermal disturbance compared with a bare tundish or a tundish with a weir-dam arrangement. When using a turbulence inhibitor higher volume fractions of melt obey a pluglike flow. The dimensionless quantity Gr/Re2, where Gr and Re are the Grashof and Reynolds number respectively, quantifies buoyancy forces: high values indicate that buoyancy forces have more effect than inertial forces on fluid flow. When Gr/Re2 < 5, buoyancy forces have no noticeable influence on fluid flow.
Original languageAmerican English
Pages (from-to)33-43
Number of pages28
JournalIronmaking and Steelmaking
DOIs
StatePublished - 1 Jan 2001

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control equipment
Steel
Buoyancy
Flow control
buoyancy
Molten materials
steels
output
inhibitors
dams
Turbulence
turbulence
Dams
simulation
Temperature
temperature
fluid flow
Flow of fluids
Weirs
Grashof number

Cite this

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abstract = "The effects of flow control devices and buoyancy forces on the melt flow in a large tundish have been mathematically simulated using a k-ε turbulence model. Flow control devices included arrangements consisting of a pair of weirs and a pair of dams, a turbulence inhibitor and a pair of dams, and only a turbulence inhibitor. Buoyancy forces were simulated using step inputs of temperature and inputs of varying ladle stream temperature into the tundish. It was found that with inputs of hot steel, flow control devices improve performance by driving the melt upwards through the action of buoyancy forces. A bare tundish is less sensitive to buoyancy forces and shows greater thermal mixing than any other arrangement. Inputs of temperature steps promote higher temperature gradients of liquid steel inside the vessel than inputs of varying ladle stream temperature. A turbulence inhibitor delays the thermal disturbance compared with a bare tundish or a tundish with a weir-dam arrangement. When using a turbulence inhibitor higher volume fractions of melt obey a pluglike flow. The dimensionless quantity Gr/Re2, where Gr and Re are the Grashof and Reynolds number respectively, quantifies buoyancy forces: high values indicate that buoyancy forces have more effect than inertial forces on fluid flow. When Gr/Re2 < 5, buoyancy forces have no noticeable influence on fluid flow.",
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Mathematical simulation of effects of flow control devices and buoyancy forces on molten steel flow and evolution of output temperatures in tundish. / Morales, R. D.; López-Ramírez, S.; Palafox-Ramos, J.; Zacharias, D.

In: Ironmaking and Steelmaking, 01.01.2001, p. 33-43.

Research output: Contribution to journalArticle

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AB - The effects of flow control devices and buoyancy forces on the melt flow in a large tundish have been mathematically simulated using a k-ε turbulence model. Flow control devices included arrangements consisting of a pair of weirs and a pair of dams, a turbulence inhibitor and a pair of dams, and only a turbulence inhibitor. Buoyancy forces were simulated using step inputs of temperature and inputs of varying ladle stream temperature into the tundish. It was found that with inputs of hot steel, flow control devices improve performance by driving the melt upwards through the action of buoyancy forces. A bare tundish is less sensitive to buoyancy forces and shows greater thermal mixing than any other arrangement. Inputs of temperature steps promote higher temperature gradients of liquid steel inside the vessel than inputs of varying ladle stream temperature. A turbulence inhibitor delays the thermal disturbance compared with a bare tundish or a tundish with a weir-dam arrangement. When using a turbulence inhibitor higher volume fractions of melt obey a pluglike flow. The dimensionless quantity Gr/Re2, where Gr and Re are the Grashof and Reynolds number respectively, quantifies buoyancy forces: high values indicate that buoyancy forces have more effect than inertial forces on fluid flow. When Gr/Re2 < 5, buoyancy forces have no noticeable influence on fluid flow.

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