%0 Journal Article %A Gerbino, Filippo %A Mameli, Mauro %A Di Marco, Paolo %A Filippeschi, Sauro %D 2017 %I Begell House %K optical fiber, slug flow, local void fraction, liquid meniscus velocity %N 1 %P 23-42 %R 10.1615/InterfacPhenomHeatTransfer.2018025431 %T LOCAL VOID FRACTION AND FLUID VELOCITY MEASUREMENTS IN A CAPILLARY CHANNEL WITH A SINGLE OPTICAL PROBE %U https://www.dl.begellhouse.com/journals/728e68e739b67efe,0985c7947a06db4b,41ace8cf787d74d5.html %V 5 %X 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. %8 2018-03-01