Advertisement

Experiments in Fluids

, Volume 51, Issue 3, pp 701–710 | Cite as

Effects of sub-millimeter-bubble injection on transition to turbulence in natural convection boundary layer along a vertical plate in water

  • Atsuhide KitagawaEmail author
  • Hiroki Endo
  • Yoshimichi Hagiwara
Research Article

Abstract

Temperature and velocity measurements are performed to clarify the effects of sub-millimeter-bubble injection on the transition to turbulence in the natural convection boundary layer along a vertical plate in water. In particular, we focus on the relationship between the bubble injection position L and the transition to turbulence in the natural convection boundary layer. The bubble injection positions used in our experiments are L = 1.6 and 3.6 mm. Bubble injection at L = 1.6 mm delays the transition to turbulence in the natural convection boundary layer, while that at L = 3.6 mm accelerates the transition to turbulence in the boundary layer. In the case of L = 1.6 mm, the appearance region of the liquid velocity fluctuation in the bubble-induced upward flow in the upstream unheated section is restricted to near the wall, although the peak of the liquid velocity fluctuation is high. In contrast, in the case of L = 3.6 mm, the relatively large liquid velocity fluctuation is distributed widely over the laminar boundary layer width. These results suggest that the effect of the liquid velocity fluctuation on the laminar boundary layer is quite different between L = 1.6 and 3.6 mm. It is therefore expected that the transition to turbulence in the natural convection boundary layer for the case with bubble injection is dependent on the magnitude and appearance region of the liquid velocity fluctuation in the bubble-induced upward flow in the upstream unheated section.

Keywords

Heat Transfer Coefficient Natural Convection Heat Transfer Enhancement Reynolds Shear Stress Heated Plate 
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 (2000a) Characteristics of turbulent combined-convection boundary layer along a vertical heated plate. Int J Heat Fluid Flow 21:520–525CrossRefGoogle Scholar
  2. Hattori Y, Tsuji T, Nagano Y, Tanaka N (2000b) Retransition from turbulence to laminar flow in a combined-convection boundary layer along a vertical heated plate. In: Proceedings of 4th JSME-KSME thermal engineering conference. pp 1–6Google Scholar
  3. 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
  4. Hattori Y, Tsuji T, Nagano Y, Tanaka N (2005) Effect of freestream turbulence on combined-convection boundary layer along a vertical heated plate. In: Proceedings of 4th international symposium on turbulent shear flows phenomena, Williamsburg, vol 3. pp 989–994Google Scholar
  5. 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
  6. 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
  7. 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
  8. 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
  9. Kitagawa A, Kitada K, Hagiwara Y (2010) Experimental study on turbulent natural convection heat transfer in water with sub-millimeter-bubble injection. Exp Fluids 49:613–622CrossRefGoogle Scholar
  10. Martinez-Mercado J, Palacios-Morales CA, Zenit R (2007) Measurement of pseudoturbulence intensity in monodispersed bubbly liquids for 10 < Re < 500. Phys Fluids 19(103302):1–13Google 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. Takemura F, Takagi S, Magnaudet J, Matsumoto Y (2002) Drag and lift forces on a bubble rising near a vertical wall in a viscous liquid. J Fluid Mech 461:277–300zbMATHCrossRefGoogle Scholar
  13. Tamari M, Nishikawa K (1976) The stirring effect of bubbles upon the heat transfer to liquids. Heat Transf Jpn Res 5:31–44Google Scholar
  14. Tokuhiro AT, Lykoudis PS (1994a) Natural convection heat transfer from a vertical plate-I. Enhancement with gas injection. Int J Heat Mass Trans 37:997–1003CrossRefGoogle Scholar
  15. Tokuhiro AT, Lykoudis PS (1994b) Natural convection heat transfer from a vertical plate-II. With gas injection and transverse magnetic field. Int J Heat Mass Transfer 37:1005–1012CrossRefGoogle Scholar
  16. Tokuhiro AT, Maekawa M, Iizuka K, Hishida K, Maeda M (1998) Turbulent flow past a bubble and an ellipsoid using shadowimage and PIV techniques. Int J Multiphase Flow 24:1383–1406zbMATHCrossRefGoogle Scholar
  17. 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
  18. Vliet GC, Liu CK (1969) An experimental study of turbulent natural convection boundary layers. Trans ASME J Heat Trans 91:517–531Google Scholar

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Atsuhide Kitagawa
    • 1
    Email author
  • Hiroki Endo
    • 1
  • Yoshimichi Hagiwara
    • 1
  1. 1.Department of Mechanical and System EngineeringKyoto Institute of TechnologySakyo-kuJapan

Personalised recommendations