By C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE (auth.), C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE, J. S. Mason BSc, PhD, CEng, FIMechE, FIMarE, MIMinE (eds.)
An knowing of the homes and the dealing with features of drinks and gases has lengthy been considered as an important requirement for many practicing engineers. it's accordingly no longer spectacular that, through the years, there was a customary visual appeal of books facing the basics of fluid mechanics, fluid movement, hydraulics and similar issues. what's outstanding is that there was no parallel improvement of the similar self-discipline of Bulk Solids dealing with, regardless of its expanding significance in smooth the world over. it's only very lately based method of the instructing, and studying, of the topic has began to conform. A explanation for the sluggish emergence of Bulk Solids dealing with as an permitted subject of research in educational classes on mechanical, agricultural, chemical, mining and civil engineering might be that the perform is so frequently taken with no consideration. definitely the diversity of fabrics being dealt with in bulk is nearly never-ending, ranging in dimension from advantageous dirt to rocks, in price from refuse to gold, and in temperature from deep-frozen peas to near-molten metal.
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Extra info for Bulk Solids Handling: An Introduction to the Practice and Technology
E. the value ofFN (negative) for which the shear strength is zero. ) is often used as the definition of the 'cohesion' ofthe bulk solid. Thus for a non-cohesive (free-flowing) material, pT. 16) which passes through the origin. A convenient graphical treatment of the relationships between the shear and normal (consolidating) stresses in bulk solids involves the use of the Mohr circle of stress. 23a. 24 illustrates the manner in which these stresses can be represented by the use of the Mohr stress circle.
C. (1970) Principles of Powder Mechanics, Pergamon, Oxford. 1 Introduction A good understanding of the nature of bulk solids flow is an essential prerequisite to the design of virtually any system involving the storage or handling of such materials. Observation of a bulk material discharging from a hopper or flowing under gravity along a steeply inclined channel will immediately suggest similarities to the behaviour of liquids. Whilst there are certainly some similarities between the flow characteristics of bulk solids and liquids, the analogy is one that it is unwise to pursue.
The limiting value of the resistive shear stress (when the bulk solid is on the point of sliding) may be termed the 'shear strength' of the material. Naturally the magnitude of the consolidating force on the bulk solid will have a major influence on the shear strength, and other factors having an effect will include the nature of the particles themselves, the packing arrangement and the prior history of the material. A plot ofthe relationship between the normal compressive force, F N• and the shear strength, Sr, is commonly called the 'yield locus' for the bulk solid concerned.
Bulk Solids Handling: An Introduction to the Practice and Technology by C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE (auth.), C. R. Woodcock DipTech, MSc, PhD, CEng, MIMechE, J. S. Mason BSc, PhD, CEng, FIMechE, FIMarE, MIMinE (eds.)