Advertisement

Experiments in Fluids

, Volume 49, Issue 3, pp 613–622 | Cite as

Experimental study on turbulent natural convection heat transfer in water with sub-millimeter-bubble injection

  • Atsuhide KitagawaEmail author
  • Kenji Kitada
  • Yoshimichi Hagiwara
Research Article

Abstract

Using thermocouples and a particle tracking velocimetry technique, temperature and velocity measurements are conducted to investigate flow and heat transfer characteristics of turbulent natural convection from a vertical heated plate in water with sub-millimeter-bubble injection. Hydrogen-bubbles generated by the electrolysis of water are used as the sub-millimeter-bubbles. In the turbulent region, the heat transfer deterioration occurs for a bubble flow rate Q = 33 mm3/s, while the heat transfer enhancement occurs for Q = 56 mm3/s. Temperature and velocity measurements suggest that the former is caused by a delay of the transition due to the bubble-induced upward flow. On the other hand, the latter is mainly due to two factors: one is the enhancement of the rotation of eddies in the outer layer, and the other is the increase in the gradient of the streamwise liquid velocity at the heated wall. These are caused by bubbles, which are located in the inner layer, rising at high speed.

Keywords

Heat Transfer Enhancement Liquid Velocity Reynolds Shear Stress Heated Plate Heated Wall 
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.

References

  1. Hattori Y, Tsuji T, Nagano Y, Tanaka N (2000) Retransition from turbulence to laminar flow in a combined-convection boundary layer along a vertical heated plate. Proc 4th JSME-KSME Thermal Engineering Conference 1–6Google Scholar
  2. Hattori Y, Tsuji T, Nagano Y, Tanaka N (2001) Effects of freestream on turbulent combined-convection boundary layer along a vertical heated plate. Int J Heat Fluid Flow 22:315–322CrossRefGoogle Scholar
  3. Hattori Y, Tsuji T, Nagano Y, Tanaka N (2005) Effect of freestream turbulence on combined-convection boundary layer along a vertical heated plate. Proceedings of 4th international symposium on turbulent shear flows phenomena, Williamsburg, vol 3:989–994Google Scholar
  4. Kajitani T, Tsuji T, Kojima Y, Sasaki K (2007) Velocity and temperature measurements in a turbulent natural convection boundary layer in water. Trans JSME (Series B) 73:1229–1235 (in Japanese)Google Scholar
  5. Kenning DBR, Kao YS (1972) Convective heat transfer to water containing bubbles: enhancement not dependent on thermocapillarity. Int J Heat Mass Transf 15:1709–1717CrossRefGoogle Scholar
  6. Kim JY, Ghajar AJ (2006) A general heat transfer correlation for non-boiling gas-liquid flow with different flow patterns in horizontal pipes. Int J Multiphase Flow 32:447–465zbMATHCrossRefGoogle Scholar
  7. Kitagawa A, Hagiwara Y, Kouda T (2007) PTV investigation of phase interaction in dispersed liquid–liquid two-phase turbulent swirling flow. Exp Fluids 42:871–880CrossRefGoogle Scholar
  8. Kitagawa A, Kosuge K, Uchida K, Hagiwara Y (2008) Heat transfer enhancement for laminar natural convection along a vertical plate due to sub-millimeter-bubble injection. Exp Fluids 45:473–484CrossRefGoogle Scholar
  9. Kitagawa A, Uchida K, Hagiwara Y (2009) Effects of bubble size on heat transfer enhancement by sub-millimeter bubbles for laminar natural convection along a vertical plate. Int J Heat Fluid Flow 30:778–788CrossRefGoogle Scholar
  10. Monde M, Mitsutake Y (1995) Enhancement of heat transfer due to bubbles passing through a narrow vertical rectangular channel (Change in heat transfer along flow). Heat Mass Transf 31:77–82CrossRefGoogle Scholar
  11. Murai Y, Oishi Y, Takeda Y, Yamamoto F (2006) Turbulent shear stress profiles in a bubbly channel flow assessed by particle tracking velocimetry. Exp Fluids 41:343–352CrossRefGoogle Scholar
  12. Tamari M, Nishikawa K (1976) The stirring effect of bubbles upon the heat transfer to liquids. Heat Transf Jpn Res 5:31–44Google Scholar
  13. Tokuhiro AT, Lykoudis PS (1994) Natural convection heat transfer from a vertical plate-I. Enhancement with gas injection. Int J Heat Mass Transf 37:997–1003CrossRefGoogle Scholar
  14. Tokuhiro AT, Maekawa M, Iizuka K, Hishida K, Maeda M (1998) Turbulent flow past a bubble and an ellipsoid using shadow-image and PIV techniques. Int J Multiphase Flow 24:1383–1406zbMATHCrossRefGoogle Scholar
  15. Tsuji T, Kajitani T, Nishino T (2007) Heat transfer enhancement in a turbulent natural convection boundary layer along a vertical flat plate. Int J Heat Fluid Flow 28:1472–1483CrossRefGoogle Scholar
  16. Vliet GC, Liu CK (1969) An experimental study of turbulent natural convection boundary layers. Trans ASME J Heat Transf 91:517–531Google Scholar
  17. Zimmerman R, Gurevich M, Mosyak A, Rozenblit R, Hetsroni G (2006) Heat transfer to air-water annular flow in a horizontal pipe. Int J Multiphase Flow 32:1–19zbMATHCrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Atsuhide Kitagawa
    • 1
    Email author
  • Kenji Kitada
    • 1
  • Yoshimichi Hagiwara
    • 1
  1. 1.Department of Mechanical and System EngineeringKyoto Institute of TechnologyKyotoJapan

Personalised recommendations