Bulk Solids Handling: An Introduction to the Practice and by C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE, J. S. Mason

By C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE, J. S. Mason BSc, PhD, CEng, FIMechE, FIMarE, MIMinE (auth.)

An realizing ofthe homes and the dealing with features of beverages and gases has lengthy been considered as a necessary requirement for many practicing engineers. it truly is as a result no longer superb that, through the years, there was a standard visual appeal of books facing the basics of fluid mechanics, fluid movement, hydraulics and comparable subject matters. what's awesome is that there was no parallel improvement of the similar self-discipline of Bulk Solids dealing with, regardless of its expanding significance in glossy internationally. it is just very lately dependent method of the instructing, and studying, of the topic has all started to conform. A explanation for the gradual emergence of Bulk Solids dealing with as an permitted subject of analysis in educational classes on mechanical, agricultural, chemical, mining and civil engineering may be that the perform is so usually taken with no consideration. definitely the range of fabrics being dealt with in bulk is nearly never-ending, ranging in measurement from positive dirt to rocks, in worth from refuse to gold, and in temperature from deep-frozen peas to near-molten metal.

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U .. i . 12 The wide-angle scanning photosedimentometer ('WASP'). 2 560 1000 long time to settle under gravity in the selected dispersant. The exact size range that can be determined by photosedimentation depends principally upon the dispersant used and the density of the particles but, as an example, for sand settling in water, measurement over the range 2-60 11m should be possible. 6). Optical microscopy. 8 11m up to 150 11m. It has the advantage of allowing examination and measurement of individual particles of the material in question, and the method can often be used where other techniques fail.

31). 22) is termed the 'wall yield locus' and for most bulk solids is found to be below the yield locus for the same material. ). 22) is found to be a reliable representation of the behaviour of dry bulk solids on dry surfaces, and for such cases the value of the constant Cw approaches zero. 31 'Wall yield locus' for a bulk solid in contact with a plane surface. 5 Measurement of wall friction Tilting plate method. In this method a thin layer of the bulk solid concerned is carefully laid on to a horizontal plate made of the required wall material.

14 shows diagrammatically the basic components of a Coulter counter. In operation the stopcock A is opened so that the action of the vacuum pump causes the electrolyte to flow from the beaker through the orifice and also draws mercury up into the siphon. The stopcock is then closed, but the effect of the mercury siphon restoring its balance causes the flow of electrolyte through the orifice to continue. 5 ml) has passed through the orifice. 14 Diagrammatic representation of a basic Coulter counter.

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