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2 2003

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Experimental and numerical investigation of one and two-phase natural convection

Krepper E., Prasser H.M.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

2003

Z. 77

33-39

Experiments were performed to investigate heating up processes of fluids in storage tanks under the influence of an external heat sourec. Several teste were carried out both with heating from the bottom an with heating from the side walls. The test tank was equipped with thermocouples for measuring the temperature distriburion and with needle probes for measuring of the local void fraction.

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.