Void Fraction Measurement by an Ultrasonic Transmission Technique in Bubbly Gas-Liquid Two-Phase Flow

Chang, Jen‐Shih; Ichikawa, Yasumasa; Irons, G. A.; Morala, E. C.; Wan, P.T.

doi:10.1007/978-3-642-82112-7_17

Cited by 26 publications

(25 citation statements)

References 11 publications

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“…The mathematical equivalent is the convolution of the spectra given by Eqs. (7) and (8). The result, called the demodulated signal, is…”

Section: Introductionmentioning

confidence: 99%

Measurement of Velocity Profiles in Upwards Oil/Water Flow Using Ultrasonic Doppler Velocimetry

Morriss¹,

Hill²

1991

SPE Annual Technical Conference and Exhibition

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An experimental study used pulsed ultrasonic Doppler techniques to determine fluid velocities in two-phase oil-water vertical pipe flow.· The data acquisition system was based on a medical ultrasound instrument, modified as needed, and a microcomputer. Measurements were made in a pipe with an inside diameter of7.25 in. [18.4 cm], part of the Multiphase Flow Loop in the Department of Petroleum Engineering at The University of Texas at Austin. This pipe is 42 ft [12.8 m] long and can be inclined at any angle. The ultrasonic measurements gave reasonable qualitative results in all regimes of which the flow facility is capable: the Doppler frequency was generally proportional to the phase velocities. More theoretical and experimental work is needed, though, to improve the quantitative accuracy and to increase the measurement range: measured velocities were generally too low, and the range limit is estimated to be approximately 6 to 12 cm into the flow, depending on the regime. Backflow is measured on the low side when the pipe is inclined from the vertical.

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“…The mathematical equivalent is the convolution of the spectra given by Eqs. (7) and (8). The result, called the demodulated signal, is…”

Section: Introductionmentioning

confidence: 99%

Measurement of Velocity Profiles in Upwards Oil/Water Flow Using Ultrasonic Doppler Velocimetry

Morriss¹,

Hill²

1991

SPE Annual Technical Conference and Exhibition

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“…Chang et al (1984) have reported a good relationship between phase holdup and attenuation. The change in acoustic velocity due to gas phase has been investigated by various researchers (Warsito et al, 1995;Soong et al, 1995;Macchi et al, 2001;Vatanakul et al, 2003;and Zheng and Zhang, 2004).…”

Section: Introductionmentioning

confidence: 89%

Ultrasonic technique to determine particle size and concentration in slurry systems

Shukla

Prakash

2006

Chemical Engineering Science

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“…Under sterile fermentation conditions special sensors such as pressure transducers (Luo et al, 1997) may be used. It is therefore, suitable for opaque systems and has a faster response (Chang et al, 1984;Stolojanu and Prakash, 1997). Hot film anemometer probe (Karamanev et al, 1996) was also used to measure the difference of heat conductivity between liquid and gas phase.…”

Section: Gas Holdup and Mass Transfer Ratesmentioning

confidence: 99%

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

Gumery¹,

Ein‐Mozaffari²,

Dahman³

2009

International Journal of Chemical Reactor Engineering

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There has been tremendous development within mixing operations in industry. Incomplete knowledge of this process caused serious economic losses to process industries. For optimum yields and the economic potential that goes with better understanding of mixing, research in this field continues to grow. The major forms of mixing in industry are either by mechanical or pneumatic agitation. Airlift bioreactors achieve mixing through pneumatic agitation and have gained attention over two decades for their fluid dynamic characteristics and low power consumption. It has been widely applied in bioprocess industries for production of biochemicals, to wastewater treatment in which the performance of this reactor has been overwhelming with respect to its production levels as compared to the conventional mechanical agitation.In this review, mixing through mechanical and pneumatic agitation is compared. An extensive literature is distilled from various investigators on the hydrodynamics and mixing characteristics of airlift bioreactors. This review has emphasis on factors that affect mixing such as the geometrical parameters of the vessel, gas flow rate, properties of the liquid medium, sparger design and measuring techniques employed. In an attempt to understand process related issues, sophisticated advances in the measuring techniques provides more insight into mixing in this reactor. Thus extensive correlations have been proposed by various investigators to predict the hydrodynamic and mixing parameters. Some design modifications proposed by several scholars have also been reviewed.

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Void Fraction Measurement by an Ultrasonic Transmission Technique in Bubbly Gas-Liquid Two-Phase Flow

Cited by 26 publications

References 11 publications

Measurement of Velocity Profiles in Upwards Oil/Water Flow Using Ultrasonic Doppler Velocimetry

Measurement of Velocity Profiles in Upwards Oil/Water Flow Using Ultrasonic Doppler Velocimetry

Ultrasonic technique to determine particle size and concentration in slurry systems

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

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