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Förslaget inkom 2005-02-07

Practical Application of the Mathematical Modelling On the Nozzle configuration in a strip casting process (gh)

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
PART 1. An experimental and numerical study of the fluid flow (turbulence effect),
heat transfer and solidification in a continous strip/up caster.
PART 2. Water-Modeling study of the inlet nozzle jet design.
PART 3 Water-Modeling study of the inlet submerged and slot nozzle jets.
PART 4 Mathematical model of the flow pattern in the free surface and liquid pool
for inlet submerged and slot nozzle jets.
PART 5. Nozzle design in a strip casting process.
PART 6. Casting trial

5. General description

To have a better control on the casting process, develpopment of accurate and efficient modelling tools are needed. Three different objectives can be considered:

1. Experiments conducted using a transparent plastic water model of the system aiming to investigate the effects of the design variable of the inlet nozzle jets and operating parameter in adjusting the tundish/ nozzles on the flow pattern.

2. To develop a mathematical model of the flow pattern in the liquid pool, and thereby to determine how molten copper is distributed below the nozzles. The effect of submerged and slot inlet nozzle jets will also be studed. To verify acceptable accuracy of the model, its predictions will be compared with experiments performed earlier in part 1.

3. To model a comprehensive mathematical model for fluid flow, heat transfer and solidification within a continuous strip casting. This model can be used to investigate the effects of nozzle configuration (design) in a strip casting process. The most important casting operation and design variables on the solidification behaviour will be studied. Experiments will be performed in order to evaluate the accuracy of the model.

6. Target

The model will ultimately be applied to predict and understand the effects of different variables on the solidification process and finally to have a better control on the casting process. In practice a new set of inlet nozzle system will be preposed


7. Objective and part goals

The objective can be divided in the following part goals:

Part 1:
Investigation of the following operating parameter on the flow pattern, heat and distribution, temperature profile and solidification front by experimental and numerical study;
- Casting velocity/inlet velocity;
- Super heat;
- Cooling effect;
- 2-3D computation
- Turbulence;

Part 2:
Investigation of the following operating parameter on the flow pattern by water modelling study:
- Adjustment in height of the tundish;
- Misplacement of the tundish;
- Liquid level in the tundish,
- Misalignment of the inlet nozzle jets;
- Dimension of the inlet nozzle jets;
- Plug in of the inlet nozzle jets;
- Formation of the air/gas bubbles;
- Trying to measure the fluid/particle velocity in the liquid part of the water-model (*)
- Number of the inlet nozzle jets tundish;
- Casting speed/inlet velocity;

Part 3: Investigation of the following operating parameter on the flow pattern, by water modelling study:

a) Submerged nozzle experiments:
- Number of the inlet nozzle jets
- Plug in of the inlet nozzle jets
- Inlet velocity
- Formation of the air/gas bubbles

b) Submerged nozzle (T-profile):
- Number of the inlet nozzle jets
- Plug in of the inlet nozzle jets
- Inlet velocity
- Formation of the air/gas bubbles

c) Semi-Slot- Submerged nozzle:
- Number of the inlet nozzle slots
- Plug in of the inlet nozzle slots
- Effect of inlet velocity
- Formation of the air/gas bubbles

d) Slot- Submerged nozzle experiments (With STOPPER):
- Inlet velocity
- Formation of the air/gas bubbles
- Stopper

Part 4: Numerical and experimental study on the:

- Comparing of the turbulence in slot nozzle and inlet nozzle jets.
- Preliminary study of the free surface (comparing submerged nozzles and the free stre

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