Experimental investigation of cryogenic oscillating heat pipes |
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| Authors: | A.J. Jiao H.B. Ma J.K. Critser |
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| Affiliation: | 1. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;2. Nuclear Engineering Department, Wolf Creek Nuclear Operating Corporation, P.O. Box 411, Burlington, KS 66839, USA;1. University of Bergamo, Engineering Dep., Viale Marconi 5, 24044 Dalmine, BG, Italy;2. University of Pisa, DESTEC, Largo L. Lazzarino 2, 56122 Pisa, PI, Italy;3. University of Brighton, School of Computing, Engineering and Mathematics, Lewes Road, BN2 4GJ Brighton, UK;1. Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, PR China;2. Shen Yuan Honors College, Beihang University, Beijing 100191, PR China;3. Beijing Key Laboratory of Space Thermal Control Technology, Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, PR China;1. Key Laboratory of Space Energy Conversion Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, 100190 Beijing, China;2. Beijing Institute of Space Mechanics & Electricity, 1 Nandahongmen Road, 100049 Beijing, China;1. Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, PR China;2. Shenyuan Honors School, Beihang University, Beijing 100191, PR China;3. Beijing Key Laboratory of Space Thermal Control Technology, Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, PR China;4. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. University of Bergamo, Department of Industrial Engineering, viale Marconi 5, 24044 Dalmine, Italy;2. Indian Institute of Technology Kanpur, 208016 Kanpur, UP, India |
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| Abstract: | A novel cryogenic heat pipe, oscillating heat pipe (OHP), which consists of an 4 × 18.5 cm evaporator, a 6 × 18.5 cm condenser, and 10 cm length of adiabatic section, has been developed and experimental characterization conducted. Experimental results show that the maximum heat transport capability of the OHP reached 380 W with average temperature difference of 49 °C between the evaporator and condenser when the cryogenic OHP was charged with liquid nitrogen at 48% (v/v) and operated in a horizontal direction. The thermal resistance decreased from 0.256 to 0.112 while the heat load increased from 22.5 to 321.8 W. When the OHP was operated at a steady state and an incremental heat load was added to it, the OHP operation changed from a steady state to an unsteady state until a new steady state was reached. This process can be divided into three regions: (I) unsteady state; (II) transient state; and (III) new steady state. In the steady state, the amplitude of temperature change in the evaporator is smaller than that of the condenser while the temperature response keeps the same frequency both in the evaporator and the condenser. The experimental results also showed that the amplitude of temperature difference between the evaporator and the condenser decreased when the heat load increased. |
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