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하부폐쇄 환상공간의 외부 튜브길이가 풀비등에 미치는 영향

Effects of Outer Tube Length on Pool Boiling in an Annulus with Closed Bottoms


To improve pool boiling heat transfer in an vertical annulus with closed bottoms, the length of an outer tube has been changed from 0.2m to 0.6m. For the test, a heated tube of 19.1mm diameter and water at atmospheric pressure have been used. Annular conditions are made using glass tubes fabricated around the heated tube. The gap size of the annulus is 3.65mm. To elucidate effects of the outer tube length on heat transfer results of the annulus are compared with the data of a single unrestricted tube and the annulus with wider gap size of 6.35mm. Throughout the tests much higher heat transfer coefficients are observed for the annulus of 3.65mm gap size comparing to the other two cases. The change in the outer tube length results in much variation in heat transfer coefficients. Moreover, with shortening the length of outer tube the possibility of the CHF occurrence can be removed.

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참고문헌 (13)

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  3. Chung, Y.J., Yang, S.H., Kim, H.C. and Zee, S.Q., 2004, 'Thermal Hydraulic Calculation in a Passive Residual Heat Removal System of the SMART-P Plant for Forced and Natural Convection Conditions,' Nuclear Engineering and Design, Vol. 232, pp. 277 - 288 
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  9. Kang, M.G., 2005, 'Effects of Outer Tube Length on Saturated Pool Boiling Heat Transfer in a Vertical Annulus with Closed Bottom,' Int. J. Heat Mass Transfer, Vol. 48, No. 13, pp. 2795-2800 
  10. Fujita, Y., Ohta, H., Uchida, S. and Nishikawa, K., 1988,. ''Nucleate Boiling Heat Transfer and Critical Heat Flux in Narrow Space Between Rectabgular Spaces,' Int. J. Heat Mass Transfer, Vol. 31, No. 2, pp. 229 - 239 
  11. Passos, J.C., Hirata, F.R., Possamai, L.F.B., Balsamo, M. and Misale, M., 2004, 'Confined Boiling of Fcn and FC87 on a Downward Facing Heating Copper Disk,' Int. J. Heat Fluid Flow, Vol. 25, pp. 313 -319 
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이 논문을 인용한 문헌 (2)

  1. Kang, Myeong-Gie ; Yoo, Joo-Sik 2007. "Effects of Bottom Inflow Area on Pool Boiling Heat Transfer in a Vertical Annulus" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 31(7): 604~610 
  2. Hwang, Soon Choel ; Kim, Sang Kyum ; Park, Ji Yun ; Lee, Do Kyun ; Lee, Si Hyun ; Rhee, Young Woo 2014. "Kinetic study on Low-rank Coal Including K2CO3, Na2CO3, CaCO3 and Dolomite Gasification under CO2 Atmosphere" 청정기술 = Clean technology, 20(1): 64~71 


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