Bubble aspect ratio and velocity measurement using a four-point fiber-optical probe

Luther, Stefan; Rensen, Judith; Guet, S.

doi:10.1007/s00348-003-0725-7

Cited by 33 publications

(2 citation statements)

References 15 publications

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“…Although one can measure the bubble size and distribution with the particle tracking velocimetry technique in the very dilute (<1%) bubbly flow [32,66], the optical fibre technique is mainly used for bubble detection in bubbly flows [67][68][69][70][71][72][73][74]. The optical probe is a local phase detection device, which can distinguish between water and air.…”

Section: Two-phase (Bubbly) Tc Flowmentioning

confidence: 99%

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

Sun

Zhou

2014

Nonlinearity

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Taylor-Couette (TC) flow and Rayleigh-Bénard (RB) convection are two systems in hydrodynamics, which have been widely used to investigate the primary instabilities, pattern formation, and transitions from laminar to turbulent flow. These two systems are known to have an elegant mathematical similarity. Both TC and RB flows are closed systems, i.e. the total energy dissipation rate exactly follows from the global energy balances. From an experimental point of view, the inherent simple geometry and symmetry in these two systems permits the construction of high precision experimental setups. These systems allow for quantitative measurements of many different variables, and provide a rich source of data to test theories and numerical simulations. We review the various experimental techniques in these two systems in fully developed turbulent states.

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Section: Two-phase (Bubbly) Tc Flowmentioning

confidence: 99%

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

Sun

Zhou

2014

Nonlinearity

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“…In order to accurately measure the gas holdup, afiber probe array must be used. Selecting an appropriate data fusion algorithm for fiber probe array is the key task to improve the gas hold-up accuracy [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Research on estimation of optical fiber probe gas holdup based on the adaptive weighted data fusion algorithm

Li¹,

Liao²

2018

IJHT

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The gas holdup of oil-gas-water three-phase flow is intimately connected with stream pattern, flow rate and tension. Regarding the deviation problem in the measurement of fiber optic probe gas holdup in oil-gas-water three-phase flow, this paper presents an evaluation method to measure the gas holdup of fiber optic probe based on data fusion. Firstly, the method applies the Grubbs criterion to eliminate the omission errors in the gas holdup data collected by a single fiber optic probe in a period of time. Secondly, it acquires the optimal value of the fiber optic probe in a certain time quantum by estimating the data collected by the fiber optic probe in batches. After obtaining the optimal value of the data collected by the four fiber optic probes in the downhole optical fiber probe array, the author adopts the self-adaptive weighted fusion algorithm, fuses data according to the optimization principle of the total minimum mean squared error and calculates the accurate value of the gas holdup of oil-gas-water three-phase flow in the wellbore in a certain time quantum. The experimental results show that this kind of method can improve the measurement accuracy of gas holdup and achieve more accurate estimate in oil-gas-water three-phase flow.

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Fiber-optic probe measurements of void fraction and bubble size distributions beneath breaking waves

Rojas

Loewen

2007

Exp Fluids

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Bubble aspect ratio and velocity measurement using a four-point fiber-optical probe

Cited by 33 publications

References 15 publications

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

Research on estimation of optical fiber probe gas holdup based on the adaptive weighted data fusion algorithm

Fiber-optic probe measurements of void fraction and bubble size distributions beneath breaking waves

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