Scale-up methods for pipeline transport of slurries |
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| Authors: | AD Thomas |
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| Institution: | M.D. Research Company Pty, Ltd., North Ryde, N.S.W. Australia |
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| Abstract: | The behaviour of different types of slurries is discussed under two main headings: homogeneous and heterogeneous. Methods of scaling-up pressure-drop data obtained in small-diameter pipes to large-diameter pipes are discussed and recommendations are made as to the best method to use for different slurries. For slurries which flow in a homogeneous manner, the Bowen scale-up procedure is recommended. In the case of heterogeneous flowing slurries it is shown how their behaviour in small pipes can be used to further classify them into semi-heterogeneous or fully heterogeneous types. For scale-up of the latter, the Durand type of equation is recommended. For the semi-heterogeneous slurries, which are often the ones of most commercial interest, it is shown how no existing correlations adequately describe their behaviour. A new scale-up equation is proposed for these slurries.All scale-up methods are illustrated by using experimental data obtained in pipes from 50 mm to 300 mm diameter. It is shown how tests in pipes of diameter no greater than 100 mm can accurately predict pressure drop to within 15% in pipes up to three times this diameter. |
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