Cap Bubble Drift Velocity in a Confined Test Section

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In the two-group interfacial area transport equation, bubbles are categorized into two groups, i.e., spherical/distorted bubbles as group 1 and cap/slug/churn-turbulent bubbles as group 2. The bubble rise velocities for both groups of bubbles may be estimated by the drift flux model by applying different distribution parameters and drift velocities for both groups. However, the drift velocity for group 2 bubbles is not always applicable (when the wall effect becomes important) as in the current test loop of interest where the flow channel is confined by two parallel flat walls, with a dimension of 200-mm in width and 10-mm in ... continued below

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Sun, Xiaodong; Kim, Seungjin; Ishii, Mamoru; Lincoln, Frank W. & Beus, Stephen G. October 9, 2002.

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Description

In the two-group interfacial area transport equation, bubbles are categorized into two groups, i.e., spherical/distorted bubbles as group 1 and cap/slug/churn-turbulent bubbles as group 2. The bubble rise velocities for both groups of bubbles may be estimated by the drift flux model by applying different distribution parameters and drift velocities for both groups. However, the drift velocity for group 2 bubbles is not always applicable (when the wall effect becomes important) as in the current test loop of interest where the flow channel is confined by two parallel flat walls, with a dimension of 200-mm in width and 10-mm in gap. The previous experiments indicated that no stable slug flow existed in this test section, which was designed to permit visualization of the flow patterns and bubble characteristics without the distortion associated with curved surfaces. In fact, distorted cap bubbly and churn-turbulent flow was observed. Therefore, it is essential to developed a correlation for cap bubble drift velocity in this confined flow channel. Since the rise velocity of a cap bubble depends on its size, a high-speed movie camera is used to capture images of cap bubbles to obtain the bubble size information. Meanwhile, the rise velocity of cap and elongated bubbles (called cap bubbles hereafter) is investigated by examining the captured images frame by frame. As a result, the conventional correlation of drift velocity for slug bubbles is modified and acceptable agreements between the measurements and correlation estimation are achieved.

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INIS; OSTI as DE00835557

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  • American Nuclear Society Winter Annual Meeting, Washington, DC (US), 11/17/2002

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  • Report No.: B-T-3472
  • Grant Number: AC11-98PN38206
  • Office of Scientific & Technical Information Report Number: 835557
  • Archival Resource Key: ark:/67531/metadc787665

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  • October 9, 2002

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  • Dec. 3, 2015, 9:30 a.m.

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  • March 24, 2016, 5:54 p.m.

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Sun, Xiaodong; Kim, Seungjin; Ishii, Mamoru; Lincoln, Frank W. & Beus, Stephen G. Cap Bubble Drift Velocity in a Confined Test Section, article, October 9, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc787665/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.