Modeling air flow in Al2O3 melt problem
 

Dear everyone!

I need to model the flow of air and molten oxide in an Al2O3-melting furnace. The gas is pushed into the melt on 3.2 bars (in a 6 mm diameter tube) using an "oxidizing pike" which is quite thick compared to the tube. The melt volume is much higher than the oxidizing tube.

The tube is nearly vertical (~12 degrees from vertical) and the gravity's direction is nearly opposite with the gas flow.

As I think, a thinner stream or chanel of air should appear first and farer from the tube, the stream should form into bubbles. Unfortunatley it does not happen. A huge bubble appears in front of the tube and later the melt is pushed out from the furnace. What should be the solution?

The melt is quite viscous (0,04 Pa.s). I turned on surface tension modeling too with constant surface tension.

The air comes in thru a pressure-inlet. There is a pressure-outlet with zero pressure to simulate an open surface. The model is steady with Eulerian multiphase.


Please help.
Thanks