We introduce a new Darcy scale model in which the permeability of the gas phase is replaced by a new expression for the gas phase velocity. When the bubbles are smaller that a critical radius, capillary forces anchor the bubbles and the gas phase does not move. Above the critical radius the bubbles move at a velocity of the same order as the liquid phase velocity. <br>The number of bubbles per unit volume may vary through coalescence between neighboring bubbles. The coalescence rate is an important parameter in the model. When coalescence is fast, the bubbles reach rapidly a large size at which they become mobile. The dependence of the coalescence rate on the fluid parameters and the bubble size is discussed. <br><br>The predictions of the model are then compared to several laboratory scale experiments. <br>


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error