Browse > Article

Characteristics of Heat Transfer in Three-Phase Swirling Fluidized Beds  

Son, Sung-Mo (School of Chemical Engineering, Chungnam National University)
Shin, Ik-Sang (School of Chemical Engineering, Chungnam National University)
Kang, Yong (School of Chemical Engineering, Chungnam National University)
Cho, Yong-Jun (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Yang, Hee-Chun (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Publication Information
Korean Chemical Engineering Research / v.46, no.1, 2008 , pp. 56-62 More about this Journal
Abstract
Characteristics of heat transfer were investigated in a three-phase swirling fluidized bed whose diameter was 0.102 m and 2.5 m in height. Effects of gas and liquid velocities, particle size and liquid swirling ratio ($R_S$) on the immersed heater-to-bed overall heat transfer coefficient were examined. The heat transfer characteristics between the immersed heater and the bed was well analyzed by means of phase space portraits and Kolmogorov entropy(K) of the time series of temperature difference fluctuations. The phase space portraits of temperature difference fluctuations became stable and periodic and the value of Kolmogorov entropy tended to decrease with increasing the value of liquid swirling ratio from 0.1 to 0.4. The value of Kolmogorov entropy exhibited its minimum with increasing liquid swirling ratio. The value of overall heat transfer coefficient (h) showed its maximum with the variation of liquid velocity, bed porosity or liquid swirling ratio, but it increased with increasing gas velocity and particle size. The value of K exhibited its maximum at the liquid velocity at which the h value attained its maximum. The overall heat transfer coefficient and Kolmogorov entropy were well correlated in terms of dimensionless groups and operating variables.
Keywords
Three-Phase; Swirling Fluidized Bed; Temperature Fluctuations; Heat Transfer Coefficient;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Van der Bleek, C. M. and Shouten, J. C., "Deterministic Chaos New tool in Fluidized Bed Design and Operation," Chem. Eng, J., 53(1), 75-87(1993).
2 Shin, K. S., Song, P. S., Lee, C. G. Kang, S. H., Kang, Y., Kim, S. D. and Kim, S. J., "Heat Transfer Coefficient in Viscous Liquid- Solid Circulation Fluidized Beds," AIChE J., 51(2), 671-677 (2005).   DOI   ScienceOn
3 Kim, S. D. and Kang, Y., "Hydrodynamic, Heat and Mass Transfer in Inverse and Circulating Three-phase Fluidized-bed Reactors for Waste Water Treatment," Studies in Surface Science and Catalyst, 159, 103-108(2006).   DOI
4 Lin, T. J. and Chiu, H. T., "Effects of Macroscopic Hydrodynamics on Heat Transfer in a Three-phase Fluidized Bed," Catalysis Today, 79-80, 159-167(2003).   DOI   ScienceOn
5 Lefebvre, S., Guy C. and Chaouki, J., "Solid Phase Hydrodynamics of Three-phase Fluidized Beds-A Convective/dispersive Mixing Model," Chem. Eng. J. 133(1-3), 85-95(2007).   DOI   ScienceOn
6 Kang, Y., Cho, Y. J., Lee, C. G., Song, P. S. and Kim, S. D., "Radial Liquid Dispersion and Bubble Distribution in Threephase Circulating Fluidized Beds," Can. J. Chem. Eng., 81(6), 1130-1138(2003).   DOI   ScienceOn
7 Grassberger, P. and Procaccia, I., "Estimation of the Kolmogorov Entropy from a Chaotic Signal," Physical review A, 28(4), 2591-2593(1983).   DOI
8 Fan, L. S., Gas-Liquid-Solid Fluidization Engineering, Butterworths, Stonehair, MA.(1989).
9 Son, S. M., Kang, S. H., Kang, Y. and Kim, S. D., "Characteristics of Particle Flow and Heat Transfer in Liquid-Particle Swirling Fluicized Beds," Korean Chem. Eng. Res. 44(5), 505-512(2006).
10 Cho, Y. J., Song, P. S., Kim, S. H., Kang, Y. and Kim, S. D., "Stochastic Analysis of Gas-liquid-solid Flow in Three-phase Circulating Fluidized Beds," J. Chem. Eng. Japan., 34(2), 254-261 (2001).   DOI   ScienceOn
11 Son, S. M., Shin, H. J., Kang, S. H., Kang, Y. and Kim, S. D., "Characteristic of Phase Holdups and Pressure Fluctuations in a Three-Phase Swirling Fluidized Bed," J. Korean Ind. Eng. Chem. 15(6), 652-658(2004).
12 Kim, S. D. and Kang, Y., "Heat and Mass Transfer in Threephase Fluidized Beds; An Overview," Chem. Eng. Sci., 52(21- 22), 3639-3660(1997).   DOI   ScienceOn