Heat and Mass Transfer

, Volume 51, Issue 12, pp 1669–1680 | Cite as

Understanding thermo-fluidic characteristics of a glass tube closed loop pulsating heat pipe: flow patterns and fluid oscillations

  • V. K. KarthikeyanEmail author
  • K. Ramachandran
  • B. C. Pillai
  • A. Brusly Solomon


An experimental program has been carried out to understand the thermo-fluidic characterization of deionized (DI) water charged closed loop pulsating heat pipe (CLPHP) with flow patterns and fluid oscillations. The CLPHP is examined under vertical and horizontal heating modes with varying heat power. The flow patterns along with fluid oscillations are correlated with thermal performance of the CLPHP. Further, the CLPHP with copper oxide nanofluid study is carried out to understand operational behavior of the device. Fast Fourier frequencies, average frequency of the internal fluid temperature are investigated. Several important features of CLPHP operation are identified by the visual study.


Thermal Resistance Effective Thermal Conductivity Thermal Performance Base Fluid Heat Power 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols


Area (m2)


Copper oxide (-)


Specific heat (J/kgK)


Diameter (m)


Bubble frequency (Hz)


Heat transfer coefficient (W/m2K)


Thermal conductivity (W/mK)


Length (m)


Nucleation site density (m−2)


Number of parallel tubes (-)


Heat power (W)


Heat flux (W/m2)


Thermal resistance (K/W)


Radius of tube (m)


Temperature (°C)


Average temperature (°C)









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  1. 1.
    Akachi H (1996) US Patent, Patent Number 5490558Google Scholar
  2. 2.
    Nishio S (2000) Attempts to apply micro heat transfer to thermal management. In: Proceedings of heat transfer and transport phenomena in microscale, Banff, pp 32–40Google Scholar
  3. 3.
    Akachi H, Polasek F and Štulc P (1996) Pulsating heat pipes. In: Proceedings of 5th International heat pipe symposium, pp 208–217Google Scholar
  4. 4.
    Groll M, Khandekar S (2002) Pulsating heat pipes: a challenge and still unsolved problem in heat pipe science. Appl Thermodyn 23:17–28Google Scholar
  5. 5.
    Charoensawan P, Khandekar S, Groll M, Terdtoon P (2003) Closed loop pulsating heat pipes—part A: parametric experimental investigations. Appl Therm Eng 23:2009–2020CrossRefGoogle Scholar
  6. 6.
    Rittidech S, Terdtoon P, Murakami M, Kamonpet P, Jompakdee W (2003) Correlation to predict heat transfer characteristics of a closed-end oscillating heat pipe at normal operating condition. Appl Therm Eng 23:497–510CrossRefGoogle Scholar
  7. 7.
    Xu JL, Zhang XM (2005) Start up and steady thermal oscillation of a pulsating heat pipe. Heat Mass Transf 41:685–694CrossRefGoogle Scholar
  8. 8.
    Khandekar S, Dollinger N, Groll M (2003) Understanding operational regimes of closed loop pulsating heat pipes: an experimental study. Appl Therm Eng 23:707–819CrossRefGoogle Scholar
  9. 9.
    Yang H, Khandekar S, Groll M (2008) Operational limit of closed loop pulsating heat pipes. Appl Therm Eng 28:49–59CrossRefGoogle Scholar
  10. 10.
    Khandekar S, Charoensawan P, Groll M, Terdtoon P (2003) Closed loop pulsating heat pipes part B: visualization and semi-empirical modeling. Appl Therm Eng 23:2021–2033CrossRefGoogle Scholar
  11. 11.
    Zhang Y, Faghri A (2008) Advances and unsolved issues in pulsating heat pipes. Heat Transf Eng 29:20–44CrossRefGoogle Scholar
  12. 12.
    Khandekar S, Groll M (2004) An insight into thermo-hydraulic coupling in pulsating heat pipes. Int J Therm Sci 43:13–20CrossRefGoogle Scholar
  13. 13.
    Tong BY, Wong TN, Ooi K (2001) Closed-loop pulsating heat pipe. Appl Therm Eng 21:1845–1862CrossRefGoogle Scholar
  14. 14.
    Xu XL, Li YX, Wong TN (2005) High speed flow visualization of a closed loop pulsating heat pipe. Int J Heat Mass Transf 48:3338–3351CrossRefGoogle Scholar
  15. 15.
    Kim JS, Bui NH, Kim JW, Kim JH, Jung HS (2003) Flow visualization of oscillation characteristics of liquid and vapor flow in the oscillating capillary tube heat pipe. J Mech Sci Technol 17:1507–1519Google Scholar
  16. 16.
    Qu W, Ma TZ (2004) Steady state operational mechanism of looped PHP. J Eng Thermophys 25:323–325Google Scholar
  17. 17.
    Li J, Yan L (2008) Experimental research on heat transfer of pulsating heat pipe. J Therm Sci 17:181–185CrossRefGoogle Scholar
  18. 18.
    Liu S, Li J, Dong X, Chen H (2007) Experimental study of flow patterns and improved configurations for pulsating heat pipes. J Therm Sci 16:56–62CrossRefGoogle Scholar
  19. 19.
    Lin YH, Kang SW, Wu TY (2009) Fabrication of polydimethylsiloxane (PDMS) pulsating heat pipe. Appl Therm Eng 29:573–580CrossRefGoogle Scholar
  20. 20.
    Lin YH, Kang SW, Chen HL (2008) Effect of silver nano-fluid on pulsating heat pipe thermal performance. Appl Therm Eng 28:1312–1317CrossRefGoogle Scholar
  21. 21.
    Bhuwakietkumjohn N, Rittidech S (2010) Internal flow pattern on heat transfer characteristic of a closed loop oscillating heat pipe with check valves using ethanol and a silver nano-ethanol mixture. Exp Thermal Fluid Sci 34:1000–1007CrossRefGoogle Scholar
  22. 22.
    Ji Y, Ma H, Su F, Wang G (2011) Particle size effect on heat transfer performance in an oscillating heat pipe. Exp Therm Fluid Sci 35:724–727CrossRefGoogle Scholar
  23. 23.
    Li QM, Zou J, Yang Z, Duan YY, Wang BX (2011) Visualization of two-phase flows in nanofluid oscillating heat pipes. J Heat Transfer 133:052901CrossRefGoogle Scholar
  24. 24.
    Qu J, Wu H (2011) Thermal performance comparison of oscillating heat pipes with SiO2/water and Al2O3/water nanofluids. Int J Therm Sci 50:1954–1962CrossRefGoogle Scholar
  25. 25.
    Karthikeyan VK, Ramachandran K, Pillai BC, Brusly Solomon A (2014) Effect of nanofluids on thermal performance of closed pulsating heat pipe. Exp Therm Fluid Sci. 54:171–178CrossRefGoogle Scholar
  26. 26.
    Theofanous TG, Tu JP, Dinh AT, Dinh TN (2002) The boiling crisis phenomenon Part I: nucleation and nucleate boiling heat transfer. Exp Therm Fluid Sci 26:775–792CrossRefGoogle Scholar
  27. 27.
    Mikic BB, Rohsenow WM (1969) A new correlation of pool-boiling data including the effect of heating surface characteristics. J Heat Transf 91:245–250CrossRefGoogle Scholar
  28. 28.
    Wen D, Ding Y (2005) Effect of particle migration on heat transfer in suspensions of nanoparticles flowing through minichannels. Microfluid Nanofluid 1:183–189CrossRefGoogle Scholar
  29. 29.
    Mameli M, Marengo M, Khandekar S (2014) Local heat transfer measurement and thermo-fluid characterization of a pulsating heat pipe. Int J Therm Sci 75:140–152CrossRefGoogle Scholar
  30. 30.
    Khandekar S, Gautam Anant Prasad, Sharma PK (2009) Multiple quasi-steady states in a closed loop pulsating heat pipe. Int J Therm Sci 48:535–546CrossRefGoogle Scholar
  31. 31.
    Karthikeyan VK, Khandekar S, Pillai BC, Sharma Pavan K (2014) Infrared thermography of a pulsating heat pipe: flow regimes and multiple steady states. Appl Therm Eng 62:470–480CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • V. K. Karthikeyan
    • 1
    • 2
    Email author
  • K. Ramachandran
    • 3
  • B. C. Pillai
    • 1
  • A. Brusly Solomon
    • 1
  1. 1.Centre for Research in Material Science and Thermal ManagementKarunya UniversityCoimbatoreIndia
  2. 2.Department of Mechanical EngineeringSri Ramakrishna Engineering CollegeCoimbatoreIndia
  3. 3.Department of PhysicsBharathiar UniversityCoimbatoreIndia

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