Heat transfer limitation in a vertical annular closed two-phase thermosyphon with small fill rates |
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| Affiliation: | 1. Institut für Kernenergetik und Energiesysteme, University of Stuttgart, Pfaffenwaldring 31, 7000 Stuttgart 80, Federal Republic of Germany;2. Dept of Mechanical Engineering, Seike University, Musachinoshi, Kichijoji, Tokyo, Japan;1. College of Transportation Engineering, Southeast University, 2# Sipailou, Nanjing 210096, PR China;2. Department of Civil Engineering, Nanjing University of Aeronautics & Astronautics, 29# Yudao St., Nanjing 210016, PR China;1. Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA;2. Department of Mechanical and Process Engineering, ETH Zürich, Sonneggstrasse 3, 8092 Zürich, Switzerland;3. Laboratory for Reactor Physics and Thermal-Hydraulics (LRT), Paul Scherrer Institute, 5232 Villigen PSI, Switzerland;1. Homi Bhabha National Institute, Mumbai, 400094, India;2. Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India;3. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India;1. Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamil Nadu, India;2. Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India;3. Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu, India;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | A thermosyphon with R113 as the working fluid employing fill ratios between 0.02 and 0.4, i.e. 2 and 40% of the evaporator volume, was experimentally and theoretically investigated. A critical heat flux (for which dry-out occurs) was measured which increases from about 104W m−2 at 5% fill ratio to about 5 × 104W m−2 at 40% fill ratio. The theoretical predictions are in close agreement with the experimental results. |
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