Experimental and numerical studies of the pulsating heat pipe stopover regime

被引：0
作者：
Abela, Mauro [1 ,2 ]
Mameli, Mauro [2 ]
Filippeschi, Sauro [2 ]
Nikolayev, Vadim S. [1 ]
机构：
[1] Université Paris-Saclay, CEA, SPEC, CNRS, Gif-sur-Yvette Cedex
[2] Department of Energy, Systems Land and Construction Engineering, University of Pisa, Largo L. Lazzarino, Pisa
来源：
International Journal of Heat and Mass Transfer | 2025年 / 247卷
关键词：
Dominant frequency; Pulsating heat pipe; Simulation; Stopover regime; Thermal resistance;
D O I：
10.1016/j.ijheatmasstransfer.2025.127102
中图分类号：
学科分类号：
摘要：
The experimental data previously obtained with a “Smart loop” (Abela et al. 2024) configured as an eleven-turn pulsating heat pipe (PHP) are compared here to simulation results obtained with the in house 1D transient code CASCO (French acronym for Code Avancé de Simulation du Caloduc Oscillant: Advanced PHP Simulation Code in English) version 4. CASCO has been set-up in terms of geometry, topology, material properties and thermal boundary conditions to mimic the experimental device. A comparison between numerical and experimental results is performed simultaneously on multiple parameters. First, we compare the overall heat transfer performance with a good agreement. Then we discuss the temporal evolution of fluid temperature and pressure at fixed locations. The stopover regime is deeply investigated. It is found that it is characterized by a repeating sequence of fast pressure growth (corresponding to oscillations) followed by a slower pressure decay (corresponding to PHP stopover). The dominant frequency was computed both for experimental and simulation data; an agreement was found. Similarly, the experimental and simulation data on the pressure decay rate agree. The decrease of the PHP thermal resistance with heating load is explained by a decrease of the stopover time caused by a larger pressure decay rate appearing because of a faster liquid film drying. © 2025 The Authors
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  • [11] Tecchio C., Experimental Study of Boiling: Characterization of Near-Wall Phenomena and Bubble Dynamics, (2022)
  • [12] Henry C.D., Kim J., Chamberlain B., Hartman T.G., Heater size and heater aspect ratio effects on subcooled pool boiling heat transfer in low-g, Exp. Therm Fluid Sci., 29, pp. 773-782, (2005)
  • [13] Lemmon E.W., Bell I.H., Huber M.L., McLinden M.O., NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 10.0, (2018)
  • [14] Nikolayev V.S., A dynamic film model of the pulsating heat pipe, J. Heat Transf., 133, (2011)
  • [15] Nekrashevych I., Nikolayev V.S., Effect of tube heat conduction on the pulsating heat pipe start-up, Appl. Therm. Eng., 117, pp. 24-29, (2017)
  • [16] Nekrashevych I., Nikolayev V.S., Pulsating heat pipe simulations: impact of PHP orientation, Microgravity Sci. Technol., 31, pp. 241-248, (2019)
  • [17] Okazaki S., Fuke H., Ogawa H., Performance of circular oscillating heat pipe for highly adaptable heat transfer layout, Appl. Therm. Eng., 198, (2021)
  • [18] Churchill S.W., Chu H.H.S., Correlating equations for laminar and turbulent free convection from a horizontal cylinder, Int. J. Heat Mass Transf., 18, pp. 1049-1053, (1975)
  • [19] Aussillous P., Quere D., Quick deposition of a fluid on the wall of a tube, Phys. Fluids, 12, pp. 2367-2371, (2000)
  • [20] Nikolayev V.S., Nekrashevych I., Impact of bubble nucleation on the functioning of the pulsating heat pipe: numerical simulation study, Proc. Int. Symp. Oscillating/Pulsating Heat Pipes, ISOPHP, (2019)
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