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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN Druckformat: 2169-2785
ISSN Online: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2018025431
pages 23-42

LOCAL VOID FRACTION AND FLUID VELOCITY MEASUREMENTS IN A CAPILLARY CHANNEL WITH A SINGLE OPTICAL PROBE

Filippo Gerbino
University of Pisa, DESTEC, Largo Lazzarino 2, 56122 Pisa, Italy
Mauro Mameli
Department of Energy, Systems, Land and Construction Engineering, University of Pisa, Italy
Paolo Di Marco
Department of Energy, Systems, Constructions and Territory Engineering, University of Pisa, largo Lucio Lazzarino 1, 56122 PISA Italy
Sauro Filippeschi
Department of Energy, Systems, Land and Construction Engineering, University of Pisa, Italy

ABSTRAKT

The present work investigates the capability of a single optical probe in terms of simultaneous local void fraction and velocity measurement of a two-phase slug flow in a capillary pipe. The optical fiber probe is mounted on a 2-mm internal diameter transparent tube where a water-air flow is recirculated. Tests are performed by varying both the probe position and the liquid mass flow rate. A high-speed camera is also used to check the accuracy of the optical signal and to perform a qualitative analysis on the intrusiveness of the optic probe. Results prove that accurate velocity measurements of two-phase confined flows can be performed by means of a single fiber mounted perpendicular to the flow direction. The peculiarities of the presented measurement method with respect to the one used for macroscale pipes are discussed together with a novel definition of latency length.


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