Experiments in Cap-Bubbly Two-Phase Flows for Two-Group IATE Development

Worosz, Ted; Kim, Seung-Jin; Hoxie, Chris L.

doi:10.13182/nt14-71

Cited by 12 publications

(2 citation statements)

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“…NI LabVIEW data acquisition software is used to control the NI PCI-6259 DAQ board and record voltage measurements to a computer for post processing. Additional details about the experimental facility are given by Worosz and Kim (2014).…”

Section: Experimental Facilitymentioning

confidence: 99%

Sensitivity studies on the multi-sensor conductivity probe measurement technique for two-phase flows

Worosz

Bernard

Kong

et al. 2016

Nuclear Engineering and Design

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The objective of this study is to advance the local multi-sensor conductivity probe measurement technique through systematic investigation into several practical aspects of a conductivity probe measurement system. Firstly, signal "ghosting" among probe sensors is found to cause artificially high bubble velocity measurements and low interfacial area concentration (a i) measurements that depend on sampling frequency and sensor impedance. A revised electrical circuit is suggested to eliminate this artificial variability. Secondly, the sensitivity of the probe measurements to sampling frequency is investigated in 13 two-phase flow conditions with superficial liquid and gas velocities ranging from 1.00-5.00m/s and 0.17-2.0m/s, respectively. With increasing gas flow rate, higher sampling frequencies, greater than 100kHz in some cases, are required to adequately capture the bubble number frequency and a i measurements. This trend is due to the increase in gas velocity and the transition to the slug flow regime. Thirdly, the sensitivity of the probe measurements to the measurement duration as well as the sample number is investigated for the same flow conditions. Measurements of both group-I (spherical/distorted) and group-II (cap/slug/churn-turbulent) bubbles are found to be relatively insensitive to both the measurement duration and the number of bubbles, as long as the measurements are made for a duration long enough to capture a collection of samples characteristic to a given two-phase flow system (or a statistical ensemble). Fourthly, investigation into the orientation of a double-sensor probe in the pipe indicates that the sensors should be oriented parallel to the pipe wall to ensure symmetric bubble velocity measurements. Lastly, Monte Carlo simulations are performed to study the effects of the axial (s) and lateral (d) probe sensor separation distances. In addition to

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Section: Experimental Facilitymentioning

confidence: 99%

Sensitivity studies on the multi-sensor conductivity probe measurement technique for two-phase flows

Worosz

Bernard

Kong

et al. 2016

Nuclear Engineering and Design

Self Cite

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“…The most investigated parameters in previous studies were the flow pattern, 5,6 the bubble size, 7,8 the transitions from a certain flow pattern to another, 9,10 and the two-phase flow pressure drop. 11,12…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of air-water flow characteristics in a horizontal duct

Mansour

Zahran

Rabie

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The horizontal bubbly two-phase flow is preferably used in various industrial applications because it provides high interfacial areas which enhance the heat and mass transfer. In the present research, the phase distribution of controlled air-water flow in a horizontal acrylic round pipe with 60 mm inside diameter (D) has been investigated experimentally and modeled numerically. The modeled differential pressure and the mixture velocity profile at a distance of 33D from the mixing section (fully developed region) are computed numerically and compared with those obtained experimentally from the two-phase flow system established and maintained at the National Institute of Standards (NIS-Egypt). Furthermore, the numerical and the experimental data have been compared with previous correlations and models. Reasonable quantitative agreement between all data is found. An electronic device based on Arduino Uno board was designed and used with careful data manipulation for measuring the slug bubble velocity. The results point out that the air volume fraction has a maximum value at the upper pipe wall as the gas bubbles tend to migrate to the upper wall. A new correlation was obtained for bubble migration length to the upper pipe wall which is very important in chemical industrial processes and other engineering application.

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Experimental dataset with high-speed visualization for vertical upward steam-water flow with transition from annulus to circular channel

Ooi

Zhang

Brooks

2020

International Journal of Heat and Mass Transfer

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Experiments in Cap-Bubbly Two-Phase Flows for Two-Group IATE Development

Cited by 12 publications

References 0 publications

Sensitivity studies on the multi-sensor conductivity probe measurement technique for two-phase flows

Sensitivity studies on the multi-sensor conductivity probe measurement technique for two-phase flows

Experimental and numerical study of air-water flow characteristics in a horizontal duct

Experimental dataset with high-speed visualization for vertical upward steam-water flow with transition from annulus to circular channel

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