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Heat and Mass Transfer

, Volume 55, Issue 11, pp 3275–3288 | Cite as

The effect of Total flowrate on the cooling performance of swirling coaxial impinging jets

  • Burak MarkalEmail author
Original
  • 73 Downloads

Abstract

Thermal management ability of swirling coaxial confined impinging air jets (SCCIAJ) are experimentally studied for different total flowrate. The coaxial structure of the jet is provided by a nozzle which is a cylindrical material having an inner round flow passage and three circumferential helical flow passages. Experiments are conducted for various values of dimensionless nozzle-to-plate distance (H / D = 0.5, 1.0, 1.5 and 2.0) and total flowrate (40, 50 and 60 LPM (liter per minute)). During the experiments, flowrate ratio (Q*) and heating power are set to constant values of 0.75 and 18.2 W, respectively. It is revealed that both the heat transfer rate and radial uniformity are improved by increasing total flowrate, while increasing spacing between the nozzle outlet and the target plate adversely affects the magnitude of Nusselt numbers. In this context, the condition of Qtot = 60 LPM with H / D = 0.5 presents the optimum case for heat transfer. The results obtained are also compared with the ones of the classical circular jet (Q* = 0) depending on the temperature distribution of the impingement surface. It is concluded that swirling coaxial jets with appreciate working conditions can be used as an effective tool for electronics cooling.

Nomenclature

Ar

Cross sectional area of circular flow passage of the nozzle [m2]

D

Nozzle outer diameter [m]

H

Spacing from nozzle outlet to the target surface [m]

h

Local convective heat transfer coefficient [W m−2 K−1]

Q

Volumetric flowrate [m3 s−1]

Q

Flowrate ratio, Q ∗  = Qs/Qtot

r

Radial distance [m]

r

Dimensionless radial distance, r ∗  = r/D

Ts

Local temperature on the target surface [K]

um

Mean velocity [m s−1]

Greek symbols

ρ

Density [kg m−3]

μ

Dynamic viscosity [kg m−1 s−1]

Subscripts

s

Swirling

st

Center point of the target surface (or stagnation point)

tot

Total

avg

Area-weighted average

Notes

Compliance with ethical standards

Conflict of interest

The author declared that there is no conflict of interest.

References

  1. 1.
    Markal B, Aydin O, Avci M (2012) Exergy analysis of a counter-flow Ranque-Hilsch vortex tube having different helical vortex generators. Int J Exergy 10(2):228–238.  https://doi.org/10.1504/IJEX.2012.045867 CrossRefGoogle Scholar
  2. 2.
    Chien KH, Lin YT, Chen YR, Yang KS, Wang CC (2012) A novel design of pulsating heat pipe with fewer turns applicable to all orientations. Int J Heat Mass Transf 55:5722–5728.  https://doi.org/10.1016/j.ijheatmasstransfer.2012.05.068 CrossRefGoogle Scholar
  3. 3.
    Markal B, Aydin O, Avci M (2017) Prediction of heat transfer coefficient in saturated flow boiling heat transfer in parallel rectangular microchannel heat sinks: an experimental study. Heat Transf Eng 38(16):1415–1428.  https://doi.org/10.1080/01457632.2016.1255038 CrossRefGoogle Scholar
  4. 4.
    Markal B (2018) Experimental investigation of heat transfer characteristics and wall pressure distribution of swirling coaxial confined impinging air jets. Int J Heat Mass Transf 124:517–532.  https://doi.org/10.1016/j.ijheatmasstransfer.2018.03.101 CrossRefGoogle Scholar
  5. 5.
    Markal B, Aydin O (2018) Experimental investigation of coaxial impinging air jets. Appl Therm Eng 141:1120–1130.  https://doi.org/10.1016/j.applthermaleng.2018.06.066 CrossRefGoogle Scholar
  6. 6.
    Ahmed ZU, Al-Abdeli YM, Guzzomi FG (2016) Heat transfer characteristics of swirling and non-swirling impinging turbulent jets. Int J Heat Mass Transf 102:991–1003.  https://doi.org/10.1016/j.ijheatmasstransfer.2016.06.037 CrossRefGoogle Scholar
  7. 7.
    Ahmed ZU, Al-Abdeli YM, Guzzomi FG (2017) Flow field and thermal behaviour in swirling and non-swirling turbulent impinging jets. Int J Therm Sci 114:241–256.  https://doi.org/10.1016/j.ijthermalsci.2016.12.013 CrossRefGoogle Scholar
  8. 8.
    Huang L, EL-Genk MS (1998) Heat transfer and flow visualization experiments of swirling, multi-channel, and conventional impinging jets. Int J Heat Mass Transf 41:583–600.  https://doi.org/10.1016/S0017-9310(97)00123-3 CrossRefGoogle Scholar
  9. 9.
    Colucci DW, Viskanta R (1996) Effect of nozzle geometry on local convective heat transfer to a confined impinging air jet. Exp Thermal Fluid Sci 13:71–80.  https://doi.org/10.1016/0894-1777(96)00015-5 CrossRefGoogle Scholar
  10. 10.
    Gao X, Sunden B (2003) Experimental investigation of the heat transfer characteristics of confined impinging slot jets. Exp Heat Transf 16:1–18.  https://doi.org/10.1080/08916150390126441 CrossRefGoogle Scholar
  11. 11.
    Nuntadusit C, Wae-hayee M, Bunyajitradulya A, Eiamsa-ard S (2012) Visualization of flow and heat transfer characteristics for swirling impinging jet. Int Commun Heat Mass Transf 39:640–648.  https://doi.org/10.1016/j.icheatmasstransfer.2012.03.002 CrossRefGoogle Scholar
  12. 12.
    Yu YZ, Zhang JZ, Xu HS (2014) Convective heat transfer by a row of confined air jets from round holes equipped with triangular tabs. Int J Heat Mass Transf 72:222–233.  https://doi.org/10.1016/j.ijheatmasstransfer.2014.01.004 CrossRefGoogle Scholar
  13. 13.
    Jambunathan K, Lai E, Moss MA, Button BL (1992) A review of heat transfer data for single circular jet impingement. Int J Heat Fluid Flow 13(2):106–115.  https://doi.org/10.1016/0142-727X(92)90017-4 CrossRefGoogle Scholar
  14. 14.
    Shukla AK, Dewan A (2017) Flow and thermal characteristics of jet impingement: comprehensive review. Int J Heat Technol 35:153–166.  https://doi.org/10.18280/ijht.350121 CrossRefGoogle Scholar
  15. 15.
    Ward J, Mahmood M (1982) Heat transfer from a turbulent, swirling impinging jet. Proc 7th Int Heat Transf Conf 3:401–407Google Scholar
  16. 16.
    Lee DH, Won SY, Kim YT, Chung YS (2002) Turbulent heat transfer from a flat surface to a swirling round impinging jet. Int J Heat Mass Transf 45(1):223–227.  https://doi.org/10.1016/S0017-9310(01)00135-1 CrossRefGoogle Scholar
  17. 17.
    Yuan ZX, Chen YY, Jiang JG, Ma CF (2006) Swirling effect of jet impingement on heat transfer from a flat surface to CO2 stream. Exp Thermal Fluid Sci 31:55–60.  https://doi.org/10.1016/j.expthermflusci.2005.12.007 CrossRefGoogle Scholar
  18. 18.
    Yang HQ, Kim T, Lu TJ, Ichimiya K (2010) Flow structure, wall pressure and heat transfer characteristics of impinging annular jet with/without steady swirling. Int J Heat Mass Transf 53:4092–4100.  https://doi.org/10.1016/j.ijheatmasstransfer.2010.05.029 CrossRefGoogle Scholar
  19. 19.
    Ianiro A, Cardone G (2012) Heat transfer rate and uniformity in multichannel swirling impinging jets. Appl Therm Eng 49:89–98.  https://doi.org/10.1016/j.applthermaleng.2011.10.018 CrossRefGoogle Scholar
  20. 20.
    Eiamsa-ard S, Nanan K, Wongcharee K (2015) Heat transfer visualization of co/counter-dual swirling impinging jets by thermochromic liquid crystal method. Int J Heat Mass Transf 86:600–621.  https://doi.org/10.1016/j.ijheatmasstransfer.2015.03.031 CrossRefGoogle Scholar
  21. 21.
    Celik N, Eren H (2009) Heat transfer due to impinging co-axial jets and the jets’ fluid flow characteristics. Exp Thermal Fluid Sci 33:715–727.  https://doi.org/10.1016/j.expthermflusci.2009.01.007 CrossRefGoogle Scholar
  22. 22.
    Celik N (2011) Effects of the surface roughness on heat transfer of perpendicularly impinging co-axial jet. Heat Mass Transf 47:1209–1217.  https://doi.org/10.1007/s00231-011-0785-9 CrossRefGoogle Scholar
  23. 23.
    Habib MA, Whitelaw JH (1980) Velocity characteristics of confined coaxial jets with and without swirl. J Fluids Eng 102:47–53.  https://doi.org/10.1115/1.3240623 CrossRefGoogle Scholar
  24. 24.
    Memar H, Holman JP, Dellenback PA (1993) The effect of a swirled annular jet on convective heat transfer in confined coaxial jet mixing. Int J Heat Mass Transf 36:3921–3930.  https://doi.org/10.1016/0017-9310(93)90142-S CrossRefGoogle Scholar
  25. 25.
    Mahmud T, Truelove JS, Wall TF (1987) Flow characteristics of swirling coaxial jets from divergent nozzles. J Fluids Eng 109:275–282.  https://doi.org/10.1115/1.3242661 CrossRefGoogle Scholar
  26. 26.
    Adzlan A, Gotoda H (2012) Experimental investigation of vortex breakdown in a coaxial swirling jet with a density difference. Chem Eng Sci 80:174–181.  https://doi.org/10.1016/j.ces.2012.05.027 CrossRefGoogle Scholar
  27. 27.
    Balakrishnan P, Srinivasan K (2017) Jet noise reduction using co-axial swirl flow with curved vanes. Appl Acoust 126:149–161.  https://doi.org/10.1016/j.apacoust.2017.05.009 CrossRefGoogle Scholar
  28. 28.
    Balakrishnan P, Srinivasan K (2018) Influence of swirl number on jet noise reduction using flat vane swirlers. Appl Acoust 73:256–268.  https://doi.org/10.1016/j.ast.2017.11.039 CrossRefGoogle Scholar
  29. 29.
    Dinesh KKJR, Kirkpatrick MP, Jenkins KW (2010) Investigation of the influence of swirl on a confined coannular swirl jet. Comput Fluids 39:756–767.  https://doi.org/10.1016/j.compfluid.2009.12.004 CrossRefzbMATHGoogle Scholar
  30. 30.
    Chouaieb S, Kriaa W, Mhiri H, Bournot P (2017) Swirl generator effect on a confined coaxial jet characteristics. Int J Hydrog Energy 42:29014–29025.  https://doi.org/10.1016/j.ijhydene.2017.08.061 CrossRefGoogle Scholar
  31. 31.
    Kline SJ, McClintock FA (1953) Describing uncertainties in single-sample experiments. Mech Eng 75(1):3–8Google Scholar
  32. 32.
    Choo KS, Kim SJ (2010) Comparison of thermal characteristics of confined and unconfined impinging jets. Int J Heat Mass Transf 53:3366–3371.  https://doi.org/10.1016/j.ijheatmasstransfer.2010.02.023 CrossRefGoogle Scholar
  33. 33.
    Eiamsa-ard S, Wongcharee K, Eiamsa-ard P, Thianpong C (2010) Heat transfer enhancement in a tube using delta-winglet twisted tape inserts. Appl Therm Eng 30:310–318.  https://doi.org/10.1016/j.applthermaleng.2009.09.006 CrossRefGoogle Scholar
  34. 34.
    Ozmen Y (2011) Confined impinging twin air jets at high Reynolds numbers. Exp Thermal Fluid Sci 35:355–363.  https://doi.org/10.1016/j.expthermflusci.2010.10.006 CrossRefGoogle Scholar
  35. 35.
    Ko NWM, Kwan ASH (1976) The initial region of subsonic coaxial jets. J Fluids Mech 73(2):305–332.  https://doi.org/10.1017/S0022112076001389 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Energy Systems EngineeringRecep Tayyip Erdogan UniversityRizeTurkey

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