Transition from slug to annular flow in horizontal air-water flow
Description
The transition from slug to annular flow in horizontal air-water and steam-water flow was investigated. Test sections of 50; 66.6 and 80 mm ID were used. The system pressure was 0.2 and 0.5 MPa in the air-water experiments and 2.5; 5; 7.5 and 10 MPa in the steam-water experiments. For flow pattern detection local impedance probes were used. This method was compared in a part of the experiments with differential pressure and gamma-beam measurements. The flow regime boundary is shifting strongly to smaller values of the superficial gas velocity with increasing pressure. Correlations from literature fit unsatisfactorily the experimental results. A new correlation is presented. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Es wurde der Uebergang von der Schwall- zur Ringstroemung in horizontaler Luft-Wasser- sowie Dampf-Wasser-Stroemung untersucht. Teststrecken mit 50, 66,6 und 80 mm Innendurchmesser wurden verwendet. Der Systemdruck betrug 0,2 und 0,5 MPa bei den Luft-Wasser-Experimenten und 2,5; 5; 7,5 und 10 MPa bei den Dampf-Wasser-Experimenten. Zur Bestimmung der Stroemungsform wurden lokale Impedanzsonden verwendet. Diese Methode wurde in einem Teil der Versuche mit Differenzdruck- und Gamma-Strahl-Messungen verglichen. Die Grenze zwischen den beiden Stroemungsformen verschiebt sich mit zunehmendem Druck wesentlich zu kleineren Werten der Gasvolumen-Stromdichte (superficial gas velocity). Aus der Literatur bekannte Korrelationen stimmen nur unbefriedigend mit den Experimenten ueberein. Eine neue Korrelation wird vorgeschlagen. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 43 p.
- Report number
- KFK--3189
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 13669220
- Subject category
- S42: ENGINEERING;
- Descriptors DEI
- AIR; CORRELATIONS; DENSITOMETERS; DROPLETS; GAMMA RADIATION; MEASURING METHODS; MIXING; MOCKUP; PIPES; PRESSURE DEPENDENCE; SIGNALS; TRANSDUCERS; TRANSITION FLOW; TWO-PHASE FLOW; VELOCITY; VOIDS; WATER
- Descriptors DEC
- ELECTROMAGNETIC RADIATION; FLUID FLOW; FLUIDS; GASES; HYDROGEN COMPOUNDS; IONIZING RADIATIONS; MEASURING INSTRUMENTS; OXYGEN COMPOUNDS; PARTICLES; PHOTOMETERS; RADIATIONS; STRUCTURAL MODELS