This study presents a comparison of the geometric effects of 90 deg and 45 deg elbows in horizontal two-phase air-water bubbly flow. Two separate experiments were performed in the horizontal test section made out of 50.3 mm inner diameter glass tubes. The first set of data was collected with a 90 deg elbow installed, and then a 45 deg elbow was added to the existing facility to acquire the second set of data. A total of 15 different flow conditions, all within the bubbly flow regime, were identified for the 90 deg experiment, and very similar flow conditions were extended to the 45 deg experiment. A double-sensor conductivity probe was employed to acquire the local data at seven different axial positions along the test section, out of which four measurement locations are associated with the 90 deg experiment and three with the 45 deg experiment. The data show that the elbows have a significant effect on the development of interfacial structures as well as the bubble interaction mechanisms. Furthermore, there are characteristic similarities and differences between the effects of the two elbows. While the effect of the 45 deg elbow is evident immediately after the elbow, the 90 deg elbow effect tends to propagate further downstream of the elbow rather than immediately after the elbow. Moreover, it is shown that both elbows induce spatial oscillations in the interfacial structures and two-phase flow parameters, but the degree and the nature of oscillations differ. The effects of the elbows are also compared for the axial transport of the two-phase flow parameters.
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November 2010
Research Papers
Comparison of Local Interfacial Structures Around 90 and 45-Degree Elbows in Horizontal Bubbly Flows
Mohan Yadav,
Mohan Yadav
Department of Mechanical and Nuclear Engineering,
e-mail: msy117@psu.edu
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802
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Justin D. Talley,
Justin D. Talley
Department of Mechanical and Nuclear Engineering,
e-mail: jdt195@psu.edu
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802
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Seungjin Kim
Seungjin Kim
Department of Mechanical and Nuclear Engineering,
e-mail: skim@psu.edu
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802
Search for other works by this author on:
Mohan Yadav
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802e-mail: msy117@psu.edu
Justin D. Talley
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802e-mail: jdt195@psu.edu
Seungjin Kim
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, 230 Reber Building, University Park, State College, PA 16802e-mail: skim@psu.edu
J. Fluids Eng. Nov 2010, 132(11): 111302 (12 pages)
Published Online: November 17, 2010
Article history
Received:
September 28, 2009
Revised:
October 12, 2010
Online:
November 17, 2010
Published:
November 17, 2010
Citation
Yadav, M., Talley, J. D., and Kim, S. (November 17, 2010). "Comparison of Local Interfacial Structures Around 90 and 45-Degree Elbows in Horizontal Bubbly Flows." ASME. J. Fluids Eng. November 2010; 132(11): 111302. https://doi.org/10.1115/1.4002872
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