A Study on the Measurement of the Local Void Fraction by the Optical Fibre Glass Probe : 1st Report, On the Method for the Measurement of the Local Void Fraction in a Liquid Metal Two-Phase Flow

Hinata, Shigeru

doi:10.1299/jsme1958.15.1228

Cited by 26 publications

(3 citation statements)

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“…The advantages and disadvantages of different intrusive and non-intrusive techniques and their applications to multiphasic flows have been presented by several previous works [13]. Optical probes are phase detection devices that have been developed for several decades [14][15][16][17][18]. The optical probe uses the variation of the refractive index of the medium which characterizes the phase change.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Gas–Liquid Flow in Vacuum Air-Lift Column Using an Optical Bi-Probe

Barkai

Hajem

Lacassagne

et al. 2019

Fluids

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Section: Introductionmentioning

confidence: 99%

Experimental Study of a Gas–Liquid Flow in Vacuum Air-Lift Column Using an Optical Bi-Probe

Barkai

Hajem

Lacassagne

et al. 2019

Fluids

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“…One of the fiber's ends was attached to a light source and the other to a phototransistor. The active region of the fiber defined by the outer edges of the 'U' shape was on the order of 100µm, compared to 500µm of the fiber bundle of Hinata (1972) and 300µm of the glass rods of Miller and Mitchie (1969). Using the same characteristics as glass-rod probes, the tight bend in the fiber acts in effect as a tip, with light either reflected through the fiber in air or refracted into the water.…”

Section: Intrusive Optical Phase Detection Probesmentioning

confidence: 93%

“…A fiber bundle probe created by Hinata (1972) used an array of a few hundred 30µm fiber optic cables bundled together. The fiber bundle, polished square at the end, was attached to a 500µm glass rod coated with a cladding material to aid in internal reflection, which was also polished square.…”

Section: Intrusive Optical Phase Detection Probesmentioning

confidence: 99%

Local optical phase detection probes with an application to a high speed boundary layer

Perret¹

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This thesis presents the continued development of micro optical phase detection instrumentation capable of measuring void fraction, interfacial area density, interfacial velocity and bubble sizes and their application to measurements in a high speed boundary layer. The instrumentation consists of micro sized sapphire tipped probes tailored to measure in the twophase flow of air bubbles in water. Probe tips with geometries intended to maximize field life while minimizing intrusiveness were designed, fabricated and characterized. The characterization revealed that the active region of a probe tip can go beyond the highly sensitive 45 degree tip. Controlling the active length of the tips can be achieved through a combination of taper angles and 45 degree tip size, with larger tips having shorter active lengths. The full scale bubbly flow measurements were performed on a 6 flat bottom survey boat. The aforementioned quantities were measured on bubbles naturally entrained at the bow of the boat. Probes were positioned at the bow of the boat, near the entrainment region and at the stern where the bubbles exit after having interacted with the high shear turbulent boundary layer. Experiments were conducted in fresh water, at the Coralville Lake, IA, and salt water, at the St. Andrews Bay and Gulf Coast near Panama City, FL. The results indicate that the bubbles interact significantly with the boundary layer. At low speeds, in fresh water, bubble accumulation and coalescence is evident by the presence of large bubbles at the stern. At high speeds, in both fresh and salt water, bubble breakup dominates and very small bubbles are produced near the hull of the boat. It was observed that salt water inhibits coalescence, even at low boat speeds. Void fraction was seen to increase with boat speeds above 10 knots and peaks near the wall. Bubble velocities show slip with the wall at all speeds and exhibit large RMS fluctuations, increasing near the wall.

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Fibre Optical Sensors for Measuring Local Quantities in Gas Liquid Two-Phase Flows

Spindler

Hahne

1999

Applied Optical Measurements

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A Study on the Measurement of the Local Void Fraction by the Optical Fibre Glass Probe : 1st Report, On the Method for the Measurement of the Local Void Fraction in a Liquid Metal Two-Phase Flow

Cited by 26 publications

References 0 publications

Experimental Study of a Gas–Liquid Flow in Vacuum Air-Lift Column Using an Optical Bi-Probe

Experimental Study of a Gas–Liquid Flow in Vacuum Air-Lift Column Using an Optical Bi-Probe

Local optical phase detection probes with an application to a high speed boundary layer

Fibre Optical Sensors for Measuring Local Quantities in Gas Liquid Two-Phase Flows

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