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Experimental Investigation of Flow Structure Development in Air-water Two-phase Flows

Doup, Benjamin
http://rave.ohiolink.edu/etdc/view?acc_num=osu1332514704

Abstract Details

2012, Master of Science, Ohio State University, Nuclear Engineering.
The objective of this research is to help in the development of a dynamic flow regime transition model by providing accurate experimental two-phase flow data near flow regime transitions. The experimental data will be used to help in understanding the transitions better and to benchmark/validate the dynamic flow regime transition model. The experiments are performed using a vertical cylindrical air-water two-phase flow loop that has maximum superficial gas and liquid velocities of 6.0 and 1.7 m/s, respectively. Measurements are carried out at three different axial location z/D = 10, 32, and 54 using a high-speed video camera, impedance void-meter signals, and four-sensor conductivity probes to capture the flow structure. The four-sensor conductivity probes provide 14 local radial measurements of the void fraction, gas velocity, interfacial area concentration, and Sauter mean bubble diameter at each measurement location. To validate the experimental data, the superficial gas velocity found by an area integral of the product of the local gas velocity and void fraction, that are measured using four-sensor conductivity probes, is compared with the superficial gas velocity found using rotameters and pressure measurements and the difference is generally below ±20%. The area-averaged void fractions and the void-weighted area-averaged gas velocities from the four-sensor conductivity probes are compared with their corresponding drift-flux model predicted values and the difference is generally below ±15%. The high-speed images are used to classify the flow conditions into flow regimes and this classification is used to compare the performance of a dynamic flow regime transition model that has been introduced in Wang et al. [1] and a flow regime map based on transition criteria outline in Mishima and Ishii [2]. From this comparison, it appears that the cap-bubbly to slug flow transition criteria and the slug to churn-turbulent flow transition criteria of the dynamic flow regime transition model need to be improved. The current test matrix only has two flow conditions where churn-turbulent flows are observed, more of these flow conditions need to be added to the test matrix to have a more complete benchmark of this dynamic flow regime transition model.
Xiaodong Sun, PhD (Advisor)
Richard Christensen, PhD (Committee Member)
Nuclear Engineering
two-phase flow; flow structure; flow development

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Citations

  • Doup, B. (2012). Experimental Investigation of Flow Structure Development in Air-water Two-phase Flows [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332514704

    APA Style (7th edition)

  • Doup, Benjamin. Experimental Investigation of Flow Structure Development in Air-water Two-phase Flows. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1332514704.

    MLA Style (8th edition)

  • Doup, Benjamin. "Experimental Investigation of Flow Structure Development in Air-water Two-phase Flows." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332514704

    Chicago Manual of Style (17th edition)

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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.