Browsing by Author "Thurstan, EG"
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- ItemSeparating small particles from liquids with hydro-cyclone, Part I - conclusions and recommendations arising from literature search(Australian Atomic Energy Commission, 1959) Cairns, RC; Thurstan, EG; Turner, KSA literature search has shown that a two stage hydrocyclone is required to give maximum concentration simultaneously with maximum clarification. For design purposes it is necessary to consider each operation separately. Concentration and clarification efficiencies have been proposed which will enable a choice of the major dimensions of a hydrocyclone to be made for each operation once experimental data are available for various systems. The programme of experimental work required to provide this information as well as information on operation methods is given.
- ItemSeparating small particles from liquids with the hydrocyclone, Part 111 - effects of major operating variables(Australian Atomic Energy Commission, 1961-07) Thurstan, EG; Turner, KSFor cyclone configurations producing flow ratios of 0.1 or less, the concentration efficiency increase as the feed concentration increases and then levels out at a concentration defined as the concentration slightly less than the critical feed concentration and the decrease. Both efficiencies increase logarithmically with flow rate. For a cyclone configuration of feed diameter (Di) = 0.082 in., overflow diameter (Do) = 0.098., and underflow diameter (Du) = 0.037 in., correlations are proposed for the critical feed concentration in terms of the effective density ratio and concentration and clarification efficiencies in terms of the feed concentration, feed flow rate and the Rosin-Rammler-Bennett size distribution constant of the solid. For cyclone configurations producing flow ratios from 0.2 to 0.5, the concentration efficiency is of minor importance. The clarification efficiency was found to be practically independent of concentration and also of flow rate except for materials with large distribution constants. Correlations are proposed for the clarification efficiency for a cyclone configuration of Di = 0.055 in., Do = 0.079 in., Du = 0.058 in. Optimum results may be obtained for a given suspension by choosing suitable flow ratios and hence cyclone configurations for each stage of a multi-stage unit. However, for maximum flexibility underflow throttling would be preferable. The concentration and clarification efficiencies are not greatly affected by the average particle size or size distribution of the solid but the degree of classification obtained is markedly affected by both.
- ItemSeparating small particles from liquids with the hydrocyclone, Part II - effects of major design variables(Australian Atomic Energy Commission, 1959-09) Cairns, RC; Thurstan, EG; Turner, KSHydrocyclone feed, overflow and underflow diameters are established for optimum concentration of solid and maximum clarification of liquid using an 11.5 ± 0.5 per cent, by weight suspension of sub-sieve barium sulphate in water. For a hydrocyclone with a nominal diameter (Dc) of 100 millimetres the dimensions for optimum concentration are: Feed diameter (Di) = 0.082 inch (Dc/5) Overflow diameter (Do) = 0.098 inch (Dc/4) Underflow diameter (Du) = 0.037 inch (Dc/11) Vortex finder outside Diameter (VFOD) = 0.197 inch and the dimensions for maximum clarification are: Di = 0.055 inch (Dc/7) Do = 0.079 inch (Dc/5) Du = 0.058 inch (Dc/7) VFOD = 0.197 inch Brief observations are given on the air core and the effects of feed solid concentration and feed solid particle size.