An Experimental Investigation of the Boiling Heat Transfer on the Vertical Square Surface

수직면에서의 비등 열전달에 대한 실험적 연구

  • Published : 2001.09.01


An experimental study was carried out to identify the various regimes of natural convective pool boiling and to determine the boiling heat transfer curve and Critical Heat Flux(CHF) on a vertical square surface having a 70mm width and a 70mm height. The heater made of copper block with embedded cartridge heaters is submerged in a water tank at atmospheric pressure. As the heat flux increases from 100kW/㎡ to 1.2MW/㎡, the heat transfer regime migrates from the nucleate boiling to the film boiling. The boiling heat transfer data are fitted by Rohsenow type correlation. An explosive vapor generation on the heated surface, whose size and frequency are characterized by the heat flux, is visualized using a high speed digital imaging system.


Critical Heat Flux;Pool Boiling;Severe Accident;Visualization


  1. Galloway, J. E. and Mudawar, I., 1993, 'CHF Mechanism in Flow Boiling from A Short Heated Wall-Ⅰ,Examination of Near-wall Conditions with The Aid of Photomicrography and high speed Video Imaging,' Int. J. Heat Transfer, Vol. 36, pp. 2511-2526
  2. Nishikawa, K., Fujita, Y.,Uchida, S. and Ohta, H., 1984, 'Effect of Surface Configuration on Nuclear Boiling Heat Transfer, Vol. 27, pp. 1559-1571
  3. Bae, S. W.,Kim, M. H., Lee, H. C., 2000, 'Wall Heat flux Behavior of Nucleate Pool Boiling under a Constant Temperature Condition in a Binary Mixture System,' Journal of KSME B, 24(9), pp. 1239-1246
  4. Rohsenow, W. M., 1973, Boiling in Hand Book of Heat Transfer, McGrow-Hill, NewYork, pp. 13-28
  5. Jung, D. S., Venart, J. E. and Sousa, A. C. M., 1987, 'Effects of Enhanced Surfaces and Surface Orientation on Nucleate and Film Boiling Heat Transfer in R-11,' Int. J. Heat mass Transfer 30, 2627-2639
  6. Liang, H. S., Yang, W. J., and Vrable, D. L. 1998, 'Feasibility Study of Immersion Cooling of Multi-graphite Composite Surfaces,' Proceedings of 11th IHTC. Korea, Vol. 2, pp. 512-526
  7. Yoon, H. J. and Suh, K. Y., 2000, 'Two-dimensional Analysis for the External Vessel Cooling Experiment,' Journal of Korean Nuclear Society, 32(4), p. 140
  8. Yang, S. H., Baek, W. P., Chang, S. H., 1997, 'Pool Boiling Critical Heat Flux of Water on Small Plates: Effects of Surface Orientation and Size,' International Communications in Heat and Mass Transfer, Vol. 24(8), pp. 1093-1102
  9. Chung, F. B., Haddad, K. H., 1997, 'A Hydro-dynamic Critical Heat Flux Model for Satured Pool Boiling on A Downward Facing Curved Heating surface,' Int. J. Heat Mass Transfer, Vol. 40, No. 6, pp. 1291-1302
  10. Pitts, C. C. and Leppert, G., 1966, 'The Critical Heat Flux for Electrically Heated Wires in Satured Pool Boiling,' Int. J. Heat Mass Transfer, Vol. 9, pp. 365-377
  11. Hesse, G., 1973, 'Heat Transfer in Nucleate Boiling, Maximum Heat Flux and Transition Boiling, Int. J. Heat Mass Transfer, Vol, 16, pp. 1611-1627
  12. Bui, T. D. and Dhir, V. K., 1985, 'Transition Boiling Heat Transfer on A Vertical Surface,' Transactions of ASME, Vol. 107, pp. 756-763