Dryout characteristics and flow behavior of gas-water two-phase flow through U-shaped and inverted U-shaped bends |
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| Affiliation: | 1. School of Mathematics, Southeast University, Nanjing 210096, China;2. School of Computer Science and Technology, Anhui University of Technology, Ma’anshan 243002, China;3. School of Electrical and Information Engineering, Anhui University of Technology, Ma’anshan 243002, China;4. School of Mathematical Sciences, Liaocheng University, Liaocheng 252059, China;5. School of Automation and Electrical Engineering, Linyi University, Linyi 276005, China;1. Department of Airline and Transport Service Management, Vanung University, No.1, Van-Nung Rd., Chung-Li, Tao-Yuan 32061, Taiwan, ROC;2. Department of Mechatronic, Energy, and Aerospace Engineering, Chung Cheng Institute of Technology, National Defense University, Tauyuan 33551, Taiwan, ROC;3. Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC;4. Department of Marine Engineering, National Taiwan Ocean University (NTOU), Keelung 20224, Taiwan, ROC |
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| Abstract: | Experimental results are presented on the flow behavior, pressure drop characteristics, and dryout characteristics by joule heating for the gas-water two-phase flow through U-shaped and inverted U-shaped tubes in vertical plane. The height of the vertical straight section of the test tube is 4100 mm, and two bend radii, 116 mm and 435 mm, are chosen for the experiments. The test tubes used are of transparent acrylic resin for the flow behavior test, and of stainless steel for the other tests, inside diameter being 18 mm for the former and 18.5 mm for the latter. Flow patterns in the vertical upflow and downflow sections are shown on the diagram of the superficial gas velocity versus liquid velocity. Further, the flow behavior in the bend section is made clear in relation to flow rates of gas and liquid. The pressure drop between inlet and outlet of the test tube for the two-phase flow is shown in comparisons with that for the single-phase flow of water. The threshold conditions of dryout in the bend section by joule heating are shown on the diagram of the superficial gas velocity versus liquid velocity. The location of the dryout in the bend section is also clarified. |
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