수직 환상 공간 내부의 풀핵비등 열전달

DOI QR코드

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강명기
Gang, Myeong-Gi

  • 발행 : 2001.08.01

초록

Effects of gap sizes(3.9 and 15mm) of vertical annuli and the bottom blockage on the nucleate pool boiling heat transfer at atmospheric pressure condition have been examined experimentally, and the results were compared to those with a single tube without confinement. The annular geometry resulted in significant increase in heat transfer coefficient. The effect is much enhanced with the bottom blockage. The heat transfer coefficient for the closed bottom condition is three times greater than the unconfined tube at 30kW/㎡ when the gap size is 3.9mm. However, with further increase of the heat flux much more than 70kW/㎡, all these effects were diminished.

키워드

풀비등;환상;수직튜브

참고문헌

  1. 강명기, 2000, 튜브 직경이 풀핵비등 열전달에 미치는 영향, 대한기계학회논문집 B권, 제 24권 제7호, pp. 930-937
  2. 강명기, 2001, 이력현상이 물의 풀비등에 미치는 영향, 대한기계학회 논문집 B권 (심사중)
  3. Chun, M. H. and Kang, M. G., 1998, 'Effects of Heat Exchange Tube Parameters on Nucleate Pool Boiling Heat Transfer,' ASME Journal of Heat Transfer, Vol. 120, pp. 468-476
  4. Monde, M., Mitsutake, Y., and Hayasi, M., 1999, 'Critical Heat Flux during Natural Circulation Boiling on Uniformly Heated Outer Tube in Vertical Annular Tubes Submerged in Saturated Liquid(Change in Critical Heat Flux Characteristics due to Heated equivalent Diameter),' International Journal of Heat and Mass Transfer, Vol. 42, pp. 3189-3194 https://doi.org/10.1016/S0017-9310(99)00003-4
  5. Monde, M. and Mitsutake, Y., 2000, 'Critical Heat Flux during Natural Circulation Boiling on Saturated Liquid in Annulus with Uniformly Heated Outer Tube,' ASME Journal of Heat Transfer, Vol. 122, pp. 74-79 https://doi.org/10.1115/1.521449
  6. Hung, Y. H. and Yao, S. C., 1985, 'Pool Boiling Heat Transfer in Narrow Horizontal Annular Crevices,' ASME Journal of Heat Transfer, Vol. 107, pp. 656-662
  7. Yao, S. C. and Chang, Y., 1983, 'Pool Boiling Heat Transfer in a Confined Space,' International Journal of Heat and Mass Transfer, Vol. 26, No. 6, pp. 841-848
  8. Fujita, Y., Ohta, H., Uchida, S., and Nishikawa, K., 1988, 'Nucleate Boiling Heat Transfer and Critical Heat Flux in Narrow Apace between Rectabgular Spaces,' International Journal of Heat and Mass Transfer, Vol. 31, No. 2, pp. 229-239 https://doi.org/10.1016/0017-9310(88)90004-X
  9. Bonjour, J. and Lallemand, M., 1998, 'Flow Patterns during Boiling in a Narrow apace between Two Vertical Surfaces,' International Journal of Multiphase Flow, Vol. 24, pp. 947-960 https://doi.org/10.1016/S0301-9322(98)00017-2
  10. Sun, G. and Hewitt, G. F., 1996, 'Experimental Studies on Heat Transfer in Annular Flow,' Proceeding of the 2nd European Thermal-Sciences and 14th UIT National Heat Transfer Conference, pp. 1345-1351
  11. Liu, Z. and Winterton, R. H. S., 1991, 'A General Correlation for Saturated and Subcooled Flow Boiling in Tubes and Annuli, Based on a Nucleate Pool Boiling Equation,' International Journal of Heat and Mass Transfer, Vol. 34, No. 11, pp. 2759-2766 https://doi.org/10.1016/0017-9310(91)90234-6
  12. Gungor, K. E. and Winterton, H. S., 1986, 'A General Correlation for Flow Boiling in Tubes and Annuli,' International Journal of Heat and Mass Transfer, Vol. 29, No. 3, pp. 351-358 https://doi.org/10.1016/0017-9310(86)90205-X