Abstract
The propagation of voidage waves in vertical bubbly flow is studied using the realistic model of Pauchon and the corresponding simplified model of Lisseter & Fowler. The kinematic wave speed associated with the simple model is found to give quite good predictions of voidage wave speeds. The kinematic wave speeds are also seen to compare well with the characteristic speeds of the full realistic model. Finally, the transition from bubbly to slug flow is discussed in terms of the characteristic and kinematic speeds. It is shown that the liquid slugs in slug flow can be modelled as regions of bubbly flow moving into the preceding regions of falling film flow at the appropriate shock speed.
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