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1 Transactions of the Institute of Fluid-Flow Machinery

1 2003

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Evolution of flow patterns, gas fraction profiles and bubble size distributions in gas-liquid flows in vertical tubes

Lucas D., Krepper E., Prasser H. M.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 112

37-46

Air-water flow at ambient conditions in a vertical pipe an inner diameter of 51.2 mm is investigated. An electrode wire-mesh sensor enables the measurement of the phase distribution with a very high resolution in space and in time. Local bubble size distributions are calculated from the data. The measurements were done in distances from the gas injection device. As a result, the development of bubble size distributions as well as the development of the radial gas fraction profiles can be studiet. It was found, that the bubble size distribution as well as local effects determine the transistion from bubble flow. The data are used for the development of a model, which predicts the development of the bubble size distribution and the transition from bubble flow in the case of stationary flow in a vertical pipe.