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Title: An integrative image measurement technique for dense bubbly flows with a wide size distribution

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Chemical Engineering Science
Additional Journal Information:
Journal Volume: 122; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-06 07:18:57; Journal ID: ISSN 0009-2509
Country of Publication:
United Kingdom

Citation Formats

Karn, Ashish, Ellis, Christopher, Arndt, Roger, and Hong, Jiarong. An integrative image measurement technique for dense bubbly flows with a wide size distribution. United Kingdom: N. p., 2015. Web. doi:10.1016/j.ces.2014.09.036.
Karn, Ashish, Ellis, Christopher, Arndt, Roger, & Hong, Jiarong. An integrative image measurement technique for dense bubbly flows with a wide size distribution. United Kingdom. doi:10.1016/j.ces.2014.09.036.
Karn, Ashish, Ellis, Christopher, Arndt, Roger, and Hong, Jiarong. 2015. "An integrative image measurement technique for dense bubbly flows with a wide size distribution". United Kingdom. doi:10.1016/j.ces.2014.09.036.
title = {An integrative image measurement technique for dense bubbly flows with a wide size distribution},
author = {Karn, Ashish and Ellis, Christopher and Arndt, Roger and Hong, Jiarong},
abstractNote = {},
doi = {10.1016/j.ces.2014.09.036},
journal = {Chemical Engineering Science},
number = C,
volume = 122,
place = {United Kingdom},
year = 2015,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ces.2014.09.036

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Cited by: 19works
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  • Multiphase flows are very common in industry, oftentimes involving very harsh environments and fluids. Accordingly, there is a need to determine the dispersed phase holdup using noninvasive fast responding techniques; besides, knowledge of the flow structure is essential for the assessment of the transport processes involved. The ultrasonic technique fulfills these requirements and could have the capability to provide the information required. In this paper, the potential of the ultrasonic technique for application to two-phase flows was investigated by checking acoustic attenuation data against experimental data on the void fraction and flow topology of vertical, upward, air-water bubbly flows inmore » the zero to 15% void fraction range. The ultrasonic apparatus consisted of one emitter/receiver transducer and three other receivers at different positions along the pipe circumference; simultaneous high-speed motion pictures of the flow patterns were made at 250 and 1000 fps. The attenuation data for all sensors exhibited a systematic interrelated behavior with void fraction, thereby testifying to the capability of the ultrasonic technique to measure the dispersed phase holdup. From the motion pictures, basic gas phase structures and different flows patterns were identified that corroborated several features of the acoustic attenuation data. Finally, the acoustic wave transit time was also investigated as a function of void fraction. (author)« less
  • A three-dimensional velocity measurement investigation in a cocurrent, upward bubbly pipe flow was performed by acquiring the instantaneous three-dimensional velocity field distributions of the two-phase flow with the developed three-dimensional particle image velocimetry (PIV) technique. The first stage of this investigation is to study the interaction between a single rising bubble in a pipe flow and its surrounding fluid using a PIV technique.
  • Radiographic images generated by the real-time neutron radiography system (RTNR) are analyzed by customized image processing software of the determination of instantaneous void fraction distribution. The cross-sectional averaged axial void fraction profiles and the two-dimensional void fraction profiles are determined simultaneously for each image. Various flow regimes are generated to determine if the RTNR system can accurately predict the void distribution in the radial, axial, and temporal coordinates. The results show the RTNR system correctly determines the void fraction distribution for each flow regime; however, accuracy decreases with decreasing void fraction. For net water thicknesses > 1.0 cm, the accuracymore » decreases with increasing water thickness due to the extreme sensitivity of thermal neutron interactions with light water. Heavy water is a more suitable fluid than light water for void fraction measurements in large-diameter flow systems.« less
  • Temporal resolved x-ray penumbral imaging has been developed using an image reconstruction procedure of the heuristic method and a wide dynamic range x-ray streak camera (XSC). Reconstruction procedure of the penumbral imaging is inherently intolerant to noise, a reconstructed image is strongly distorted by artifacts caused by noise in a penumbral image. Statistical fluctuation in the number of detected photon is the dominant source of noise in an x-ray image, however acceptable brightness of an image is limited by dynamic range of an XSC. The wide dynamic range XSC was used to obtain penumbral images bright enough to be reconstructed.more » Additionally, the heuristic method was introduced in the penumbral image reconstruction procedure. Distortion of reconstructed images is sufficiently suppressed by these improvements. Density profiles of laser driven brominated plastic and tin plasma were measured with this technique.« less
  • A thermal detection technique using an infrared radiometer is discussed and applied to the detection of internal heterogeneous spatial positions in materials. The internal heterogeneous space represents a cavity, an inclusion and a separation of materials. To maintain and manage various structures, their positions must be analyzed. Therefore, in this study, the transient temperature distribution above internal flaws was measured. Solar energy and lamp energy were used to realize nonsteady temperature fields on the surface of materials within an internal heterogeneous space and those temperature fields were estimated experimentally. Moreover, the authors certified the temperature field using the proposed modelmore » based on experimental results. The detection limit of the thermal detection technique is also discussed simultaneously.« less