Journal of Mechanical Science and Technology

, Volume 32, Issue 12, pp 5927–5936 | Cite as

Numerical study on the two-phase flow pattern and temperature distribution in a loop thermosyphon as a defrost device at the evaporator in the refrigerator

  • Seong Hyun Park
  • Young Soo Kim
  • Seung Youn Kim
  • Yong Gap Park
  • Man Yeong HaEmail author


This paper discusses the two-phase flow pattern and temperature distribution in a loop thermosyphon as a defrost device at the surface of the evaporator in the refrigerator with different heater locations and different heating power. A computational fluid dynamics (CFD) study was carried out using ANSYS FLUENT 15.0. The volume of fluid (VOF) model was considered to simulate evaporation and condensation at the heater surface using user-defined functions (UDFs). 2D geometries were developed with a heater inserted in the loop thermosyphon. The simulation results were verified using Fadhl’s experimental and numerical temperature data [2]. The maximum difference is 2.4 % between the calculated data and Fadhl’s data. The two-phase flow pattern and the temperature field varied with the different heater locations and heating power values. The thermal performance was evaluated based on the average temperature and temperature uniformity inside the loop thermosyphon.


Loop thermosyphon Location of a heater Heating power Evaporation and condensation Temperature uniformity inside the loop thermosyphon Average temperature inside the loop thermosyphon 


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  1. [1]
    B. Fadhl, L. C. Wrobel and H. Jouhara, Numerical modelling of the temperature distribution in a two–phase closed thermosiphon, Applied Thermal Engineering, 60 (2013) 122–131.CrossRefGoogle Scholar
  2. [2]
    B. Fadhl, L. C. Wrobel and H. Jouhara, CFD modelling of a two–phase closed thermosyphon charged with R134a and R404a, Applied Thermal Engineering, 78 (2015) 482–490.CrossRefGoogle Scholar
  3. [3]
    L. M. Poplaski, A. Faghri and T. L. Bergman, Analysis of internal and external thermal resistances of heat pipes including fins using a three–dimensional numerical simulation, International Journal of Heat and Mass Transfer, 102 (2016) 455–469.CrossRefGoogle Scholar
  4. [4]
    S. Lin, J. Broadbent and R. McGlen, Numerical study of heat pipe application in heat recovery systems, Applied Thermal Engineering, 25 (2005) 127–133.CrossRefGoogle Scholar
  5. [5]
    S. Touahri and T. Boufendi, Numerical study of the conjugate heat transfer in a horizontal pipe heated by joulean effect, Thermal Science, 16 (2012) 53–67.CrossRefGoogle Scholar
  6. [6]
    T. Daimaru, S. Yoshida and H. Nagai, Study on thermal cycle in oscillating heat pipes by numerical analysis, Applied Thermal Engineering, 113 (2017) 1219–1227.CrossRefGoogle Scholar
  7. [7]
    W. Qu and H. B. Ma, Theoretical analysis of startup of a pulsating heat pipe, International Journal of Heat and Mass Transfer, 50 (2007) 2309–2316.CrossRefzbMATHGoogle Scholar
  8. [8]
    K. Kafeel and A. Turan, Simulation of the response of a thermosyphon under pulsed heat input conditions, International Journal of Thermal Sciences, 80 (2014) 33–40.CrossRefGoogle Scholar
  9. [9]
    L. Asmaie, M. Haghshenasfard, A. Mehrabani–Zeinabad and M. N. Esfahany, Thermal performance analysis of nanofluids in a thermosyphon heat pipe using CFD modeling, Heat Mass Transfer, 49 (2013) 667–678.CrossRefGoogle Scholar
  10. [10]
    W. Lian, W. Chang and Y. Xuan, Numerical investigation on flow and thermal features of a rotating heat pipe, Applied Thermal Engineering, 101 (2016) 92–100.CrossRefGoogle Scholar
  11. [11]
    R. Ranjan, J. Y. Murthy, S. V. Garimella and U. Vadakkan, A Numerical model for transport in flat heat pipes considering wick microstructure effects, International Journal of Heat and Mass Transfer, 54 (2011) 153–168.CrossRefzbMATHGoogle Scholar
  12. [12]
    N. Minocha, J. B. Joshi, A. K. Nayak and P. K. Vijayan, 3D CFD simulation of passive decay heat removal system under boiling conditions: Role of bubble sliding motionon inclined heated tubes, Chemical Engineering Science, 145 (2016) 245–265.CrossRefGoogle Scholar
  13. [13]
    A. S. Annamalai and V. Ramalingam, Experimental investigation and computational fluid dynamics analysis of a air cooled condenser heat pipe, Thermal Science, 15 (2011) 759–772.CrossRefGoogle Scholar
  14. [14]
    S. C. K. D. Schepper, G. J. Heynderickx and G. B. Marin, Modeling the evaporation of a hydrocarbon feedstock in the convection section of a steam cracker, Computers and Chemical Engineering, 33 (2009) 122–132.CrossRefGoogle Scholar
  15. [15]
    A. Alizadehdakhel, M. Rahimi and A. A. Alsairafi, CFD modeling of flow and heat transfer in a thermosyphon, International Communications in Heat and Mass Transfer, 37 (2010) 312–318.CrossRefGoogle Scholar
  16. [16]
    Z. Lin, S. Wang, R. Shirakashi and L. W. Zhang, Simulation of a miniature oscillating heat pipe in bottom heating mode using CFD with unsteady modeling, International Journal of Heat and Mass Transfer, 57 (2013) 642–656.CrossRefGoogle Scholar
  17. [17]
    S. M. Pouryoussefi and Y. Zhang, Numerical investigation of chaotic flow in a 2D closed–loop pulsating heat pipe, Applied Thermal Engineering, 98 (2016) 617–627.CrossRefGoogle Scholar
  18. [18]
    W. Kalata, K. J. Brown and R. J. Schick, Injector study via VOF: Emphasis on vapor condensation due to spray, 23rd Annual Conference on Liquid Atomization and Spray Systems (2011).Google Scholar
  19. [19]
    W. Lei, L. Yanzhonga, L. Zhan and Z. Kanga, Numerical investigation of thermal distribution and pressurization behavior in helium pressurized cryogenic tank by introducing a multicomponent model, 25th International Cryogenic Conference & International Cryogenic Materials Conference (2014).Google Scholar
  20. [20]
    Y. U. Gu, D. K. Jeong, J. H. Hwang, Y. H. Kwon and J. S. Kim, Study on defrost of evaporator using bubble jet loop heat pipe as a defrost device, 10th International Heat Pipe Symposium (2011).Google Scholar
  21. [21]
    ANSYS FLUENT, Theory Guide (Release 15.0). Multiphase Flows, ANSYS, Inc. (2013) 465–600 (chapter 17).Google Scholar
  22. [22]
    Thermo–physical properties of fluid system, NIST webbook, NIST database, Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Seong Hyun Park
    • 1
  • Young Soo Kim
    • 2
  • Seung Youn Kim
    • 2
  • Yong Gap Park
    • 3
  • Man Yeong Ha
    • 1
    Email author
  1. 1.School of Mechanical EngineeringPusan National UniversityBusanKorea
  2. 2.Home Appliance and Air Solution Company, LG Electronics, Gaeumjeong-DongSeong San GuChangwonKorea
  3. 3.Rolls-Royce and Pusan National University Technology Centre in Thermal ManagementBusanKorea

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