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

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

An knowing ofthe houses 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 remarkable that, through the years, there was a customary visual appeal of books facing the basics of fluid mechanics, fluid stream, hydraulics and comparable subject matters. what's mind-blowing is that there was no parallel improvement of the comparable self-discipline of Bulk Solids dealing with, regardless of its expanding significance in glossy internationally. it is just very lately dependent method of the educating, and studying, of the topic has began to conform. A reason behind the sluggish emergence of Bulk Solids dealing with as an approved subject of research in educational classes on mechanical, agricultural, chemical, mining and civil engineering may be that the perform is so usually taken without any consideration. definitely the diversity of fabrics being dealt with in bulk is nearly never-ending, ranging in measurement from high-quality dirt to rocks, in worth from refuse to gold, and in temperature from deep-frozen peas to near-molten metal.

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27, a Mohr circle tangential to the yield locus and passing through the origin gives the unconfined yield stress (point F) and a second Mohr circle tangential to the yield locus at M, corresponding to the initial consolidating load, gives the major consolidating stress (point G). 34 illustrates Flow Functions for three typical bulk particulate solids. Material A is free-flowing, therefore having no cohesion, and the Flow Function coincides with the horizontal axis. Material B is slightly cohesive and material C is more cohesive still; both of these materials acquiring greater strength as the consolidating stress is increased.

Defining the shape of non-spherical particles in mathematical terms is not easy, but many 26 BULK SOLIDS HANDLING attempts have been made to established the use of shape factors to indicate the extent to which particles differ from the spherical. Probably the most commonly used of these shape factors is the 'sphericity' ยข .. defined as the reciprocal of the ratio of the surface area of a particle to that of a sphere of the same volume: A. 'I' s = surface area of sPhere} f h I . 12) ds where Asp is the surface area of the particle.

Chapman and Hall, London. 3. BS 812: 1975, 1976, Sampling and testing of mineral aggregates, sands and fillers. British Standards Institution, London. 4. BS 4359, Methods for the determination of the specific surface area of powders Part 1: 1985. Nitrogen adsorption (BET method). Part 2: 1982. Air permeability methods. Part 3: 1979. Calculation from particle size distribution. (Withdrawn 1985). British Standards Institution, London. 5. BS 3406, Methods for determination of particle size distribution.

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