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- W3206671714 abstract "The increasing heat load of mines caused by e.g. the progressive increase in mining depth, has necessitated the expansion of existing air cooling systems. An alternative is the addition of ice to the cooling water. The paper reports the results of an experimental study to provide technical information on the influence of this ice on the hydraulics. The results show that the hydraulic behaviour of ice water mixtures is different from that of a normal two-phase flow. In normal solid-liquid flow friction pressure gradients increase continuously with velocity and solid material volume concentration. The friction pressure gradients of transported ice/water mixtures increase in low velocity ranges, at constant water velocity, in proportion to the ice volume concentration. With higher velocities the fitted curves from the test results, for similar volume-concentrations, cross each other and also the pure water line. At higher velocities the differential pressure is inversely proportional to the volume concentration. In the lower velocity-range the formation of ice plugs with associated high velocity gradients at the pipe walls accounts for this behaviour. At a higher velocity range the behaviour can be explained by a damping of the turbulence and the resulting reduction in the friction pressure gradient when compared with the behaviour of pure water. Similar flow behaviour was observed in the transport of wood fibres in watery suspensions. 10 refs., 17 figs." @default.
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- W3206671714 date "1991-11-01" @default.
- W3206671714 modified "2023-09-27" @default.
- W3206671714 title "The hydraulic transport of ice for mine-cooling" @default.
- W3206671714 hasPublicationYear "1991" @default.
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