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Heat and Mass Transfer

, Volume 53, Issue 7, pp 2363–2375 | Cite as

Experimental investigation on heat transfer from square jets issuing from perforated nozzles

  • Pullarao Muvvala
  • C. BalajiEmail author
  • S. P. Venkateshan
Original

Abstract

This paper reports the results of an experimental investigation of fluid flow and heat transfer carried out with square jets issuing from perforated nozzles. This is accomplished by an impinging square jet on a uniformly heated plate of finite thickness (5 mm). The medium under consideration is air. Three different nozzle configurations are used in the study namely a single nozzle and perforated nozzles with four and nine holes, which are accommodated in the same available jet area 4.6 mm × 4.6 mm. This arrangement is akin to introducing a wire mesh at the nozzle exit plane. The effects of dimensionless jet-to-plate distance (2–9) and the mass flow rate of the jet fluid on the heat transfer rate are studied. Jet centerline mean velocity and turbulence intensity measurements are made with a hot-wire anemometer. The pressure drop across the orifice nozzle plate is measured and corresponding pumping power values are calculated. A comparison of the heat transfer performance and pumping power penalty of the three nozzle configurations is done.

Keywords

Nusselt Number Mass Flow Rate Turbulence Intensity Heat Transfer Characteristic Average Nusselt Number 
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

ab

Calibration constants of the hot-wire anemometer

B

Width of the square hole on single orifice plate (mm)

E

Voltage across the hot wire probe (V)

I

Current (A)

\(k_f\)

Thermal conductivity of air (W/mK)

L

Width of the impingement plate (mm)

m

Mass flow rate (kg/s)

Nu

Average Nusselt number

P

Pumping power \((\dot{\text {Q}}\, \Delta p)\) (W)

q

Uniform heat flux supplied (W/\(\text {m}^{2}\))

\({\dot{\hbox {Q}}}\)

Volume flow rate (l/min)

\(Q_{supp}\)

Heat supplied (W)

\(Q_{loss}\)

Heat loss (W)

\(Q_{net}\)

Net heat supplied (W)

Re

Jet Reynolds number, \(\frac{m}{\phi B\mu }\)

TI

Turbulence intensity, \(\frac{\sqrt{\overline{u'^2}}}{U_e}\times 100\)%

\(T_{ave}\)

Average impingement surface temperature (K)

\(T_{j}\)

Jet temperature at the orifice exit (K)

\(u'\)

Fluctuating component of the jet centerline velocity (m/s)

\(U_{c}\)

Jet centerline velocity (m/s)

\(U_{e}\)

Jet exit velocity (m/s)

\(U_{c}/U_{e}\)

Normalized jet centerline velocity

V

Voltage supplied to the heater (V)

Z

Jet-to-plate distance (mm)

Z / B

Dimensionless jet-to-plate distance

Greek letters

\(\mu \)

Dynamic viscosity of air (kg/m s)

\(\rho \)

Density of air (kg/\(\text {m}^3\))

\(\phi \)

Flow area ratio

\(\Delta p\)

Pressure drop (Pa)

Notes

Acknowledgements

Authors acknowledge Dr. Arvind Pattamatta and Sangamesh C Godi, HTTP Laboratory, IIT Madras, for the help provided in hot-wire anemometer measurements. Also, the first author Pullarao Muvvala would like to thank Prof. K. Srinivasan, TDCE Laboratory, IIT Madras, for the lectures on course titled “Jet flow and Acoustics”, which gave foundation knowledge for the research problem.

References

  1. 1.
    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):106–115CrossRefGoogle Scholar
  2. 2.
    Viskanta R (1993) Heat transfer to impinging isothermal gas and flame jets. Exp Therm Fluid Sci 6(2):111–134CrossRefGoogle Scholar
  3. 3.
    Weigand B, Spring S (2011) Multiple jet impingement—a review. Heat Transf Res 42:101–142CrossRefGoogle Scholar
  4. 4.
    Dewan A, Dutta R, Srinivasan B (2012) Recent trends in computation of turbulent jet impingement heat transfer. Heat Transf Eng 33(4–5):447–460CrossRefGoogle Scholar
  5. 5.
    Carlomagno GM, Ianiro A (2014) Thermo-fluid-dynamics of submerged jets impinging at short nozzle-to-plate distance: a review. Exp Therm Fluid Sci 58:15–35CrossRefGoogle Scholar
  6. 6.
    Lee J, Lee S-J (2000) The effect of nozzle configuration on stagnation region heat transfer enhancement of axisymmetric jet impingement. Int J Heat Mass Transf 43:3497–3509CrossRefGoogle Scholar
  7. 7.
    Lee J, Lee S-J (2000) The effect of nozzle aspect ratio on stagnation region heat transfer characteristics of elliptic impinging jet. Int J Heat Mass Transf 43:555–575CrossRefzbMATHGoogle Scholar
  8. 8.
    San J-Y, Lai M-D (2001) Optimum jet-to-jet spacing of heat transfer for staggered arrays of impinging air jets. Int J Heat Mass Transf 44:3997–4007CrossRefzbMATHGoogle Scholar
  9. 9.
    Singh G, Sundararajan T, Bhaskaran KA (2003) Mixing and entrainment characteristics of circular and noncircular confined jets. ASME J Fluids Eng 125:835–842CrossRefGoogle Scholar
  10. 10.
    Lee DH, Song J, Jo MC (2004) The effects of nozzle diameter on impinging jet heat transfer and fluid flow. ASME J Heat Transf 126:554–557CrossRefGoogle Scholar
  11. 11.
    Zhou DW, Lee S-J (2004) Heat transfer enhancement of impinging jets using mesh screens. Int J Heat Mass Transf 47:2097–2108CrossRefGoogle Scholar
  12. 12.
    Zhou D-W, Lee SJ, Ma CF, Bergles AE (2006) Optimization of mesh screen for enhancing jet impingement heat transfer. Heat Mass Transf 42:501–510CrossRefGoogle Scholar
  13. 13.
    Baydar E, Ozmen Y (2006) An experimental investigation on flow structures of confined and unconfined impinging air jets. Heat Mass Transf 42(4):338–346CrossRefGoogle Scholar
  14. 14.
    Aldabbagh LBY, Mohamad AA (2007) Effect of jet-to-plate spacing in laminar array jets impinging. Heat Mass Transf 43:265–273CrossRefGoogle Scholar
  15. 15.
    Zhou DW, Lee SJ (2007) Forced convective heat transfer with impinging rectangular jets. Int J Heat Mass Transf 50:1916–1926CrossRefGoogle Scholar
  16. 16.
    Gulati P, Katti V, Prabhu SV (2009) Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet. Int J Therm Sci 48:602–617CrossRefGoogle Scholar
  17. 17.
    Middelberg G, Herwig H (2009) Convective heat transfer under unsteady impinging jets: the effect of the shape of the unsteadiness. Heat Mass Transf 45:1519–1532CrossRefGoogle Scholar
  18. 18.
    Attalla M, Specht E (2009) Heat transfer characteristics from in-line arrays of free impinging jets. Heat Mass Transf 45:537–543CrossRefGoogle Scholar
  19. 19.
    Koseoglu MF, Baskaya S (2010) The role of jet inlet geometry in impinging jet heat transfer, modeling and experiments. Int J Therm Sci 49:1417–1426CrossRefGoogle Scholar
  20. 20.
    Cafiero G, Discetti S, Astarita T (2014) Heat transfer enhancement of impinging jets with fractal-generated turbulence. Int J Heat Mass Transf 75:173–183CrossRefGoogle Scholar
  21. 21.
    Gori F, Petracci I (2015) Influence of screen solidity ratio on heat transfer upon a cylinder impinged by a rectangular jet. Int J Heat Mass Transf 81:19–27CrossRefGoogle Scholar
  22. 22.
    He X, Lustbader JA, Arik M, Sharma R (2015) Heat transfer characteristics of impinging steady and synthetic jets over vertical flat surface. Int J Heat Mass Transf 80:825–834CrossRefGoogle Scholar
  23. 23.
    Vinze R, Chandel S, Limaye MD, Prabhu SV (2016) Local heat transfer distribution between smooth flat surface and impinging incompressible air jet from a chevron nozzle. Exp Therm Fluid Sci 78:124–136CrossRefGoogle Scholar
  24. 24.
    Brignoni LA, Garimella SV (2000) Effects of nozzle-inlet chamfering on pressure drop and heat transfer in confined air jet impingement. Int J Heat Mass Transf 43:1133–1139CrossRefGoogle Scholar
  25. 25.
    Royne A, Dey CJ (2006) Effect of nozzle geometry on pressure drop and heat transfer in submerged jet arrays in submerged jet arrays. Int J Heat Mass Transf 49:800–804CrossRefGoogle Scholar
  26. 26.
    Panda RK, Prasad BVSSS (2011) Conjugate heat transfer from a flat plate with shower head impinging jets. Front Heat Mass Transf 013008:1–10Google Scholar
  27. 27.
    Achari AM, Das MK (2015) Conjugate heat transfer study of turbulent slot impinging jet. J Therm Sci Eng Appl 7:1–17Google Scholar
  28. 28.
    Venkateshan SP (2015) Mechanical measurements. Athena Academic and Wiley, LondonCrossRefGoogle Scholar
  29. 29.
    Gardon R, Akfirat JC (1965) The role of turbulence in determining the heat transfer characteristics of impinging jets. Int J Heat Mass Transf 8:1261–1272CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Pullarao Muvvala
    • 1
  • C. Balaji
    • 1
    Email author
  • S. P. Venkateshan
    • 1
  1. 1.Heat Transfer and Thermal Power Laboratory, Department of Mechanical EngineeringIndian Institute of Technology MadrasChennaiIndia

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