The Occurrence of Growth Dispersion and Its Consequences
In our laboratory some experiments with K2Cr2O7 crystals in a fluidized bed have been carried out in order to determine the influence of the supersaturation and the size of the crystals on the growth rate. It was found that the growth rate of the crystals increased with size (see Table 1). Furthermore it appeared that after an experiment a spread in sizes was present. This was observed when the increase in size was large (Fig. 1). As seed crystals with a narrow size range were used it can be concluded that the increase in size and as a consequence the growth rate differs from crystal to crystal. As the supersaturation was kept constant within 5% the only reasonable explanation is that crystals of one size exhibit a spread in growth rates. We have called this phenomenon ‘growth dispersion’.
KeywordsAverage Growth Rate Grown Crystal Seed Crystal Crystal Size Distribution Number Balance
Unable to display preview. Download preview PDF.
- 1.Wright, P.G. and White, E.T.; Proc. Queensland Soc. Sugar Cane Technology, 36th Conf.; p. 299 (1969).Google Scholar
- 2.White, E.T. and Wright, P.G.; Chem. Eng. Progr. Sympos. Ser., (110) 67 (1970) 81.Google Scholar
- 3.Natal’ina, L.N. and Treivus, E.B.; Sov. Phys. Chrystallography, 19 (3), Nov.-Dec. (1974).Google Scholar
- 4.Bennema, P.; Paper B1; This Symposium.Google Scholar
- 5.Larson, M.A. and Randolph, A.D.; Chem. Eng. Progr. Sympos. Ser. (95) 65 (1969) 1.Google Scholar
- 8.White, E.T., Bendig, L.L., and Larson, M.A.; Paper presented at the 67th Annual A.I.Ch.E. Meeting, Washington, December 1974.Google Scholar
- 10.McCabe, W.L. and Stevens, R.P.; Che. Eng. Progr. (4) 47 (1951) 168.Google Scholar