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Heat Pipe Science and Technology, An International Journal

Publication de 4  numéros par an

ISSN Imprimer: 2151-7975

ISSN En ligne: 2151-7991

UNSTABLE CIRCULATION REGIMES DURING WATER BOILING IN A THERMOSYPHON LOOP UNDER ATMOSPHERIC PRESSURE

Volume 7, Numéro 1-2, 2016, pp. 31-44
DOI: 10.1615/HeatPipeScieTech.2016017187
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RÉSUMÉ

An experimental natural circulation loop has been designed and put into operation to study heat transfer and hydrodynamics in boiling under low reduced pressures. The paper presents experimental data on wall temperature measurements in natural circulation of water under atmospheric pressure. Various heat and flow regimes in the flow-up section of the loop have been studied: pure single-phase convection, pure flow boiling, and mixed regimes. Low frequency flow instability has been observed in all mixed regimes. The instability led to temperature and flow rate fluctuations, whose amplitudes were very high in some regimes. Wall temperature fluctuations were also recorded. A joint analysis of flow rate and wall temperature fluctuations is presented. Experimental data on ensemble-averaged wall temperature distributions along the heated section are compared with the results calculated according to the 1D and 2D numerical models.

CITÉ PAR
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  2. Sukomel L A, Kaban’kov O N, Numerical simulation of velocity and temperature fields in natural circulation loop, Journal of Physics: Conference Series, 891, 2017. Crossref

  3. Sukomel L. A., Kaban’kov O. N., Ankudinov V. B., Numerical Simulation of Friction and Heat Exchange in Viscous-Gravitational Fluid Flow in a Loop Thermosiphon, Journal of Engineering Physics and Thermophysics, 93, 5, 2020. Crossref

  4. Kabankov O N, Yagov V V, Zubov N O, Experimental and computational study of a low-pressure natural circulation loop, Journal of Physics: Conference Series, 2088, 1, 2021. Crossref

  5. Sukomel L A, Kaban’kov O N, Ankudinov V B, Experimental and numerical study of heat and hydraulic characteristics of low head natural circulation loops with single-phase flow of working liquid, Journal of Physics: Conference Series, 1370, 1, 2019. Crossref

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