Jet flows from bubbles during subcooled pool boiling on micro wires

  • Wang Hao 
  • D. M. Christopher
  • Peng Xiaofeng 
  • Wang Buxuan 
Article
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Abstract

An experimental investigation was conducted on subcooled nucleate boiling on ultra-small wires having diameters of 25–100 μm. High-speed photography and laser PIV (Particle Image Velocimetry) technology were used to visually observe the bubble dynamics. For highly subcooled boiling, at moderate heat fluxes, the bubbles generally remained attached to the micro heating wires and bubble-top jet flows were clearly observed. Smaller bubbles usually had stronger bubble-top jet flows, while larger bubbles seemed to produce multi-jet flows. The structures of the bubble-top jet flows, as well as multi-jet flows, were proposed from the experimental observation. A model was developed to describe jet flow phenomena from bubbles on micro wires. Numerical simulations for bubbles having diameter of 0.03 and 0.06 mm showed that both the bubble-top and multi-jet flows were induced by a strong Marangoni effect due to high temperature gradients near the wire. The predicted velocity magnitudes and flow structures agreed very well with experimental measurements. The bubble size relative to the wire is an important factor affecting the jet flow structure. For a 0.03 mm bubble on a 0.1 mm wire, only a bubble-top jet flow forms, while a complex multi-jet flow pattern forms around the bubble with a weak bubble-top jet and two side jet flows for a 0.06 mm bubble.

Keywords

subcooled boiling bubble multi-jet jet flow PIV Marangoni CFD 

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References

  1. 1.
    Dhir, V. K., Nucleate and transition boiling heat transfer under pool boiling and external flow conditions, in Proc. 9th Int. Heat Transfer Conf., Jeruslem, Israel, Vol. 1, 1990, 129–155.Google Scholar
  2. 2.
    Carey, V. P., Liquid Vapor Phase-Transition Phenomena, New York: Hemisphere Publishing House, 1992.Google Scholar
  3. 3.
    Henley, J. J., Hummel, R. L., A third factor in boiling nucleation, Industrial and Engineering Chemistry Fundamentals, 1967, 6(4): 603–606.CrossRefGoogle Scholar
  4. 4.
    Sadasivan, P., Unal, C., Nelson, R. A., Nonlinear aspects of high heat flux nucleate boiling heat transfer: formulation, LAUR-94-2222, also ASME HTD-298, 1994, 91–102.Google Scholar
  5. 5.
    Sadasivan, P., Unal, C., Nelson, R. A., Nonlinear aspects of high heat, flux nucleate boiling heat transfer: results LAUR-94-106-Revised, also ASME HTD-298, 1994, 103–114.Google Scholar
  6. 6.
    Sadasivan, P., Unal, C., Nelson, R. A., Nonlinear aspects of high heat, flux nucleate boiling heat transfer, Journal of Heat Transfer, 1995, 117: 981–989.CrossRefGoogle Scholar
  7. 7.
    Eddington, R. I., Kenning, D. B. R., The prediction of flow boiling bubble populations from gas bubbles nucleation experiments, in Proceedings of 6th International Heat, Transfer Conference, Toronto, Vol. 1, 1978, 275–279.Google Scholar
  8. 8.
    Kenning, D. B. R., Wall temperature patterns in nucleate boiling, International Journal of Heat and Mass Transfer., 1992, 35(1): 73–85.CrossRefGoogle Scholar
  9. 9.
    Kenning, D. B. R., Yan, Y.Y., Pool boiling heat transfer on a thin plate: features revealed by liquid crystal thermography. International Journal of Heat and Mass Transfer, 1996, 39(15): 3117–3137.CrossRefGoogle Scholar
  10. 10.
    Lin, L. W., Microscale thermal bubble formation-thermal physical phenomena and applications, Microscale Thermophysical Engineering, 1998, 2(2): 71.CrossRefGoogle Scholar
  11. 11.
    Lin, L. W., Pisano, A. P., Carey, V. P., Thermal bubble formation on polysilicon micro resistors, Journal of Heat Transfer. Transactions of the ASME, 1998, 120(3): 735.CrossRefGoogle Scholar
  12. 12.
    Glod, S., Poulikakos, D., Zhao, Z., et al., An investigation of microscale explosive vaporization of water on an ultrathin Pt wire, Int. J. Heat and Mass Transfer, 2002, 45(2): 367–379.CrossRefGoogle Scholar
  13. 13.
    Wang, H., Peng, X. F., Wang, B. X. et al., Jet flow phenomena during nucleate boiling. International Journal of Heat and Mass Transfer, 2002, 45(6): 1359–1363.CrossRefGoogle Scholar
  14. 14.
    Wang, H., Peng, X. F., Wang, B. X., et al., Bubble sweeping and jet flows during nucleate boiling of subcooled liquids, International Journal of Heat and Mass Transfer, 2003, 46(5): 863–869.CrossRefGoogle Scholar
  15. 15.
    Wang, H., Peng, X. F., Wang, B. X. et al., Bubble-sweeping mechanisms, Science in China (Series E), 2003, 46(3): 225–233.CrossRefGoogle Scholar
  16. 16.
    Wang, H., Peng, X. F., Pan, C. et al., Bubble-top jet flow on micro wires, Int. J. Heat and Mass Transfer, 2004, 47(14): 2891–2900.CrossRefGoogle Scholar
  17. 17.
    Shekriladze, I. G., On the role of the “Punping effect” of a vapor bubble growing at the wall during nucleate boiling, in Voprosy konvektivnogo teploobmena I chistoty vodianogo para (in Russian), Tbilisi: Metsniereba Press, 1970, 90–97.Google Scholar
  18. 18.
    Peng, X. F., Huang, Y.J., Lee, D. J., Transport phenomenon of a vapor bubble attached to a downward surface, International Journal of Thermal Sciences, 2001, 40(9): 797–803.CrossRefGoogle Scholar
  19. 19.
    Shekriladze, I. G., Mechanisms of heat, removal in the process of developed Boiling, Heat Transfer-Soviet Research, 1990, 22(4): 445–463.Google Scholar
  20. 20.
    Sharp, R. R., The nature of liquid film evaporation during nucleate boiling NASA TND-1997, Oct. 1964.Google Scholar
  21. 21.
    Carey, V. P., Liquid Vapor Phase-Transition Phenomena, New York: Hemisphere Publishing House, 1992.Google Scholar
  22. 22.
    Paul, B., Complication of evaporation coefficients, ARS Journal, 1962, 32: 1321–1328.Google Scholar
  23. 23.
    Young, N. O., Goldstein, J. S., Block, M. J., The motion of bubbles in a vertical temperature gradient, J. Fluid Mechanics, 1959, 6: 350–355.MATHCrossRefGoogle Scholar
  24. 24.
    Marek, R., Straub, J., The origin of thermocapillary convection in subcooled nucleate pool boiling. International Journal of Heat and Mass Transfer, 2001, 44: 619–632.MATHCrossRefGoogle Scholar

Copyright information

© Science in China Press 2005

Authors and Affiliations

  • Wang Hao 
    • 1
  • D. M. Christopher
    • 1
  • Peng Xiaofeng 
    • 1
  • Wang Buxuan 
    • 1
  1. 1.Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal EngineeringTsinghua UniversityBeijingChina

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