Finally, an interesting flow regime exists for a specific range of gas and liquid flow rates called the pulse flow regime. The waves quickly grow until they span the entire cross section of the column. The results are shown in the graph. The black lines indicate Talmor's predictions based on normal gravity testing of concurrent downflow conditions. This series of tests indicate a significant shift in the pulse and bubbly flow regimes.
Research is ongoing with plans to develop a more comprehensive model.
Flow map for two-phase downflow through packed beds in microgravity. AIChE J., vol.