Download Introduction to Particle Technology, Second Edition by Martin Rhodes(auth.) PDF

By Martin Rhodes(auth.)

Particle know-how is a time period used to consult the technology and expertise regarding the dealing with and processing of debris and powders. The construction of particulate fabrics, with managed houses adapted to next processing and purposes, is of significant curiosity to a variety of industries, together with chemical and procedure, meals, prescription drugs, minerals and metals businesses and the dealing with of debris in gasoline and liquid strategies is a key technological step in chemical engineering.

This textbook presents a superb advent to particle know-how with labored examples and workouts. in keeping with suggestions from scholars and practitioners world wide, it's been newly edited and includes new chapters on slurry delivery, colloids and superb debris, measurement growth and the wellbeing and fitness results of excellent powders. themes lined comprise:

  • Characterization (Size research)
  • Processing (Granulation, Fluidization)
  • Particle Formation (Granulation, dimension relief)
  • Storage and delivery (Hopper layout, Pneumatic Conveying, Standpipes, Slurry move)
  • Separation (Filtration, Settling, Cyclones)
  • Safety (Fire and Explosion dangers, well-being dangers)
  • Engineering the houses of Particulate platforms (Colloids, Respirable medicines, Slurry Rheology)

This booklet is vital analyzing for undergraduate scholars of chemical engineering on particle expertise classes. it's also useful supplementary analyzing for college students in different branches of engineering, utilized chemistry, physics, pharmaceutics, mineral processing and metallurgy. Practitioners in industries during which powders are dealt with and processed may well locate it an invaluable start line for gaining an knowing of the habit of debris and powders.

evaluate of the 1st variation taken from High Temperatures - excessive pressures 1999 31 243 – 251

"..This is a contemporary textbook that offers uncomplicated wisdom. it may be effectively used either for educating particle expertise at universities and for person examine of engineering difficulties in powder processing."   

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Additional info for Introduction to Particle Technology, Second Edition

Example text

The diameter of the sphere may be calculated from: Rep ¼ 130 ¼ rf xv UT m Hence, sphere diameter xV ¼ 619 mm. For a cube having the same terminal velocity under the same conditions, the same CD versus Rep relationship applies, only the standard drag curve is that for a cube ðc ¼ 0:806Þ. Cube sphericity For a cube of side 1 unit, the volume is 1 cubic unit and the surface area is 6 square units. If xv is the diameter of a sphere having the same volume as the cube, then px3v ¼ 1:0 which gives xv ¼ 1:24 units 6 surface area of a sphere of volume equal to the particle Therefore; sphericity c ¼ surface area of the particle 4:836 c¼ ¼ 0:806 6 43 WORKED EXAMPLES At the intersection of this standard drag curve with the plotted line, Rep ¼ 310.

Note that for irregular-shaped particles, the projected area offered to the viewer can vary significantly depending on the orientation of the particle. Techniques such as applying adhesive to the microscope slide may be used to ensure that the particles are randomly orientated. 3 Sedimentation In this method, the rate of sedimentation of a sample of particles in a liquid is followed. The suspension is dilute and so the particles are assumed to fall at their single particle terminal velocity in the liquid (usually water).

28 g of a powder of particle density 2500 kg m3 are charged into the cell of an apparatus for measurement of particle size and specific surface area by permeametry.  Dry  air of density 1:2 kg m3 and viscosity 18:4 Â 10À6 Pa s flows at a rate of 36 cm3 min through the powder (in a direction parallel to the axis of the cylindrical cell) and producing a pressure difference of 100 mm of water across the bed. Determine the surface-volume mean diameter and the specific surface of the powder sample.

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