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Heat Transfer Enhancement in vertical Mounted Tube Subjected to Uniform Heat Flux by using Electrolysis Bubble

International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Year of Publication: 2016
Akram W. Ezzat, Najdat N. Abdullah, Sajida Lafta Ghashim

Najdat Abdullah N Akram W. Ezzat and Sajida Lafta Ghashim. Heat Transfer Enhancement in vertical Mounted Tube Subjected to Uniform Heat Flux by using Electrolysis Bubble. International Journal of Computer Applications 142(12):47-55, May 2016. BibTeX

	author = {Akram W. Ezzat, Najdat N. Abdullah and Sajida Lafta Ghashim},
	title = {Heat Transfer Enhancement in vertical Mounted Tube Subjected to Uniform Heat Flux by using Electrolysis Bubble},
	journal = {International Journal of Computer Applications},
	issue_date = {May 2016},
	volume = {142},
	number = {12},
	month = {May},
	year = {2016},
	issn = {0975-8887},
	pages = {47-55},
	numpages = {9},
	url = {},
	doi = {10.5120/ijca2016909959},
	publisher = {Foundation of Computer Science (FCS), NY, USA},
	address = {New York, USA}


In the present work, experimental and numerical investigations had been carried out to investigate the effect of sub-millimeter bubbles injection on heat transfer coefficient of upward flowing water in vertical mounted tube subjected to uniform heat flux. The experimental apparatus consists of a test rig designed and built to conduct the experiments. A circular tube, test section was designed and constructed from the copper and heated by an electrical heater on its outer surface. The dimensions of copper pipe was (length= 0.7m, diameter= 0.05 m, thickness= 1.5 mm). Water temperature at inlet was kept constant at (32°C). Thermocouples distributed longitudinally at different radial distances between cylinder surface and its center at seven sections, in addition to the fluid inlet and outlet were used to measure temperatures. Bubbles generation was performed in test section by using a proper ionization current that will be passed across the anode and cathode electrodes to produce hydrogen bubbles and oxygen bubbles at different intensities. The experiments were conducted using heat fluxes (13641 and 22736) W/m2, water mass flow of (2, 3 and 4) lit/min, mass flow rate of hydrogen and oxygen bubbles were (0.02 , 0.025) lit/min respectively and Reynolds number (1214, 1783 and 2300) for water. The results showed that an enhancement of 25.5% was obtained in the averaged Nusselt number with using ionization bubbles compared with the case without bubbles.


  1. Baliffo, J. L., Bonette F., and Converti J., 1988, Measurement of heat transfer enhancement in forced convection due to hydrogen bubbles produced by electrolysis, Journal of International Communications Heat Mass Transf., Vol. 15, pp. 247–254.
  2. Hassan, Y. A. and Gutierrez, C. C.,2006, Investigation of Drag Reduction Mechanism by Micro-bubble Injection Within a Channel Boundary Layer Using Particle Tracking Velocimetry, Journal of Nuclear Engineering and Tecnology, Vol.38, No.8, PP.763-778.
  3. Lu, J., and Tryggvason, G., "Numerical study of turbulent bubbly downflows in a vertical channel", Journal of Physics of Fluids ,Vol.18, PP.1-10, (2006a).
  4. Kitagawa , A., Kosuge, K., Uchida, K., and Yoshimichi Hagiwara, 2008, Heat transfer enhancement for laminar natural convection along a vertical plate due to sub-millimeter-bubble injection, Journal of Experiments in Fluids, Vol. 45, PP. 473–484.
  5. Kitagawa, A., Uchida, K., and Hagiwara, Y., 2009a, Effects of bubble size on heat transfer enhancement by sub-millimeter bubbles for laminar natural convection along a vertical plate, International Journal of Heat and Fluid Flow , Vol.30 , PP.778–788.
  6. Kitagawa, A., Kimura, K., Endo, H., and Hagiwara,Y., 2009b, Flow and heat transfer characteristics of laminar mixed convection of water with sub-millimeter bubbles in a vertical channel , Journal of Physics,Vol.147,PP. 1-13.
  7. Kitagawa ,A., Kimura ,K., and Hagiwara ,Y., 2010a, Experimental investigation of water laminar mixed-convection flow with sub-millimeter bubbles in a vertical channel , Journal of Experiments in Fluids, Vol. 48, PP.509–519.
  8. Kitagawa ,A., Kitada , K., and Hagiwara,Y., 2010b, Experimental study on turbulent natural convection heat transfer in water with sub-millimeter-bubble injection" , Journal of Experiments in Fluids ,Vol.49 , PP.613–622.
  9. Kitagawa ,A., Endo ,H., and Hagiwara,Y., 2011, Effects of sub-millimeter-bubble injection on transition to turbulence in natural convection boundary layer along a vertical plate in water ", Journal of Experiments in Fluids, Vol. 51, PP.701–710.
  10. Hara,K., Suzuki , T., and Yamamoto,F.,2011, Image analysis applied to study on frictional-drag reduction by electrolytic microbubbles in a turbulent channel flow,Journal of Experiments in Fluids,Vol.50 , PP. 715–727.
  11. Kitagawa, A., and Murai,Y., 2013, Natural convection heat transfer from a vertical heated plate in water with microbubble injection, Journal of Chemical Engineering Science ,Vol.99 , PP. 215- 224 .
  12. Kitagawa ,A., Mimura,T., Ishikawa ,M., and Murai ,Y., 2013 ,Visualization of counter-current convection induced by microbubbles and small particles, Journal of Viscus , Vol.16, PP.313–321.
  13. Kitagawa, A., and Murai,Y., 2014a , Pulsatory rise of microbubble swarm along a vertical wall , Journal of Chemical Engineering Science ,Vol.116 ,PP. 694- 703 .
  14. Kitagawa, A., Oku, T., Ozato. T., and Murai, Y., 2014b, Effects of inclination angle of a heated plate on natural-convection heat transfer enhancement by millimeter bubbles , Journal of Transction of the JSME (in Japanses),Vol.80, No.811, PP.1-11 .
  15. Salman,Y. K., and Mohammed , H.A., 2007, Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux , Journal of Al- Khwarizmi Engineering ,Vol.3 , No.3 , pp 31-52.
  16. He,Y., Jin,Y., Chen,H., Yulong Ding ,Y., Cang ,D., and Lu.,H., 2007, Heat transfer and flow behaviour of aqueous suspensions of TiO2 nanoparticles (nanofluids) flowing upward through a vertical pipe" , International Journal of Heat and Mass Transfer,Vol. 50,PP. 2272–2281.
  17. Celata, G. P., Chiaradia, A., Cumo, M., and Annibale, F.D ,(1999), Heat transfer enhancement by air injection in upward heated mixed-convection flow of water, Journal of Multiphase Flow ,Vol.25 ,PP.1033-1052.


Hydrogen and oxygen bubbles, Bubble injection, Two-phase flow, Water electrolysis