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HWAHAK KONGHAK,
Vol.32, No.4, 566-571, 1994
Vol.32, No.4, 566-571, 1994
저밀도 입자의 액상 자유부상특성
Free Rising Characteristics of Low Density Particle in Liquid Phase
평균직경이 0.0765-0.454cm이고 평균밀도는 0.13-0.63g/㎤인 11종류의 styrofoam입자를 이용하여 입자의 액상 자유상승속도를 측정하였다. Ret>200에서 자유상승입자의 항력계수, CD는 입자직경과 입자밀도에 관계없이 0.9 정도로 거의 일정하게 나타났으며, 자유침강입자의 항력계수에 비해 높게 나타났다. 입자의 Galileo number와 terminal Reynolds number와의 관계는 Ga=18Ret+2.2Ret1.8, 표준항력곡선은 CD=(24/Ret)+2.93Ret -0.2 로 나타났다.
Eleven styrofoam particles, with diameter ranges of 0.0765-0.454cm and density ranges of 0.13-0.63g/㎤, were used to measure free-rising velocity of particles. At Ret>200, drag coefficient, CD of free rising particle was independent of its diameter and density. The drag coefficient was calculated as a constant value of 0.9 which showed higher value than that of free settling particle. The correlation between Galileo number and terminal Reynolds number was given to Ga=18Ret+2.2Ret1.8 and standard drag curve was found as CD=(24Ret)+2.93Ret-0.2.
[References]
- Clift R, Grace JR, Weber ME, "Bubbles, Drops and Particles," Acad. Press, New York, 1978
- Christiansen EB, Barker DH, AIChE J., 11, 145, 1965
- Karamanev DG, Nikolov LN, AIChE J., 38, 1843, 1992
- Perry RH, Chilton CH, "Chemical Engineer's Handbook," 5th ed., McGraw-Hill Book Company, New York, N.Y., 1973
- Mersmann A, Ger. Chem. Eng., 1, 1, 1978
- Nikolov LN, Karamanev DG, Can. J. Chem. Eng., 65, 214, 1987
- Kim DS, Sea BK, Lee MG, Song SK, HWAHAK KONGHAK, 31(5), 563, 1993
- Schiller L, Naumann A, Z. Ver. Deutsch. Ing., 77, 318, 1935
- Turton R, Levenspiel O, Powder Technol., 47, 83, 1986
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