Abstract
A combined experimental and theoretical investigation of the sedimentation of unstable colloidal ceramic suspensions has been performed. Suspensions containing submicron-sized α-Al2O3 particles were prepared at various pH values in order to modify suspension stability. Particle volume fraction during sedimentation was determined as a function of position and time by gamma-ray densitometry. A population balance model was developed to account for various coagulation and decoagulation mechanisms that affect sedimentation behavior in flocculating suspensions. Model predictions were then compared with experimental measurements, in order to establish the validity of the theoretical model.
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References
J. S. Reed, Introduction to Ceramic Engineering (John Wiley, New York, 1988).
F. M. Auzerais, R. Jackson, W. B. Russel, and W. F. Murphy, J. Fluid Mech. 221, 613–639 (1990).
M. A. Al-Naafa and M. S. Selim, Can. J. Chem. Eng. 67, 253–264 (1989).
W. B. Russel, The Dynamics of Colloidal Systems (University of Wisconsin Press, Madison, WI, 1987).
F. F. Lange, J. Am. Ceram. Soc. 72 (1), 3–15 (1989).
C. H. Schilling, W-H. Shih, and I. A. Aksay, in Ceramic Powder Science IV, edited by S. Hiranno, G. L. Messing, and H. Hausner (American Ceramic Society, Westerville, OH, 1991), Vol. 22, pp. 307–321.
L. Bergström, C. H. Schilling, and I. A. Aksay, J. Am. Ceram. Soc. (1993, in press).
G. K. Batchelor, J. Fluid Mech. 52 (2), 245–268 (1972).
R. H. Davis and K. H. Birdsell, A.I.Ch.E.J. 34 (1), 123–129 (1988).
Y. T. Shih, D. Gidaspow, and D. T. Wasan, Powder Technol. 50, 201–215 (1987).
G. K. Batchelor, J. Fluid Mech. 119, 379–408 (1982).
G. K. Batchelor and C-S. Wen, J. Fluid Mech. 124, 495–528 (1982).
P. Somasundaran, Fine Particles Processing, edited by P. Somasundaran (American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc., New York, 1980), pp. 947–976.
A. Suzuki and I. Kashiki, Ind. Eng. Chem. Res. 26, 1464–1548 (1987).
S. G. Mason, J. Colloid Interf. Sci. 58 (2), 275–285 (1977).
R. D. Harding, J. Colloid Interf. Sci. 40 (2), 164–173 (1972).
G. C. Jeffery and R. H. Ottewill, Colloid Polym. Sci. 268, 179–189 (1990).
Z. Xu and R-H. Yoon, J. Colloid Interf. Sci. 134 (2), 427–434 (1990).
K. E. Davis, W. B. Russel, and W. J. Glantschnig, J. Chem. Soc. Faraday Trans. 83 (3), 411–424 (1991).
F. M. Auzerais, R. Jackson, and W. B. Russel, J. Fluid Mech. 195, 437–462 (1988).
R. Buscall, Colloid Surf. 43, 33–53 (1990).
C. H. Schilling and I. A. Aksay, Transactions of the Canadian University—Industry Council on Advanced Ceramics–Third Workshop, February 24–25, 1987, Montreal, Quebec.
R. B. Bird, W. E. Stewart, and E. N. Lightfoot, Transport Phenomena (John Wiley, New York, 1960).
P. T. L. Koh, J. R. G. Andrews, and P. H. T. Uhlherr, Chem. Eng. Sci. 42 (2), 353–362 (1987).
G. F. Froment and K. B. Bischoff, Chemical Reactor Analysis and Design (John Wiley, New York, 1979).
J. H. Clarke, A. N. Clarke, and D. J. Wilson, Sep. Sci. Tech. 13, 767–789 (1978).
R. D. Vigil and R. M. Ziff, J. Colloid Interf. Sci. 133 (1), 257–264 (1989).
G. K. Batchelor and J. T. Green, J. Fluid Mech. 56 (3), 401–427 (1972).
C. W. J. Beenakker and P. Mazur, Phys. Lett. 91 (6), 290–291 (1982).
I. A. Valioulis and E. J. List, Adv. Colloid Interf. Sci. 20, 1–20 (1984).
G. D. Parfitt and J. Peacock, Surf. Colloid Sci. 10, 163–226 (1978).
A. Molski, Colloid Polym. Sci. 267, 371–375 (1989).
B. Carnahan, H. A. Luther, and J. O. Wilkes, Applied Numerical Methods (John Wiley, New York, 1969).
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Abel, J.S., Stangle, G.C., Schilling, C.H. et al. Sedimentation in flocculating colloidal suspensions. Journal of Materials Research 9, 451–461 (1994). https://doi.org/10.1557/JMR.1994.0451
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DOI: https://doi.org/10.1557/JMR.1994.0451