Chapter_1_-_Properties_of_Particulate_Solids

Chapter_1_-_Properties_of_Particulate_Solids - Chapter 1...

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Chapter 1 Properties of Particulate Solids Instructor: Dr. Rami Jumah Department of Chemical Engineering Jordan University of Science and Technology
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 2 Characterization of Solid Particles Most important characteristics of an individual solid particle: Shape (regular or irregular) Size (diameter) Density Size and shape are easily specified for regular particles, such as spheres and cubes, but for irregular particles such as sand grains, the term size and shape are not so clear and must be defined.
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 3 Particle Shape The shape of an individual particle is expressed in terms of the sphericity s , which is independent of particle size. For a nonspherical particle, the sphericity is defined as D p = nominal or equivalent diameter of the particle s p = surface area of one particle v p = volume of one particle Specific surface: p s p surface-volume ratio for a sphere of diameter D surface-volume ratio for the particle whose nominal size is D   2 3 1 p p 6 p p D / D 6 s s p s p p / D / v / v   (1) p v p s (surface of a particle) a (volume of a particle) v Eq. (1) v s p 6 a D  (2)
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 4 An equivalent volume sphere diameter can be defined as the diameter of a sphere having the same volume as the particle For fine granular materials, however, it is difficult to determine the exact volume an surface area of a particle, and D p is usually taken to be the nominal size based on screen analyses or microscopic examinations. The surface area can be found from adsorption measurements. For a spherical particle of diameter D p , s = 1. 3 p D 6 p p V D
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 5 Particle Size Regular-shaped particles can be accurately described by giving the shape and a number of dimensions: No single physical dimension can adequately describe the size of an irregularly shaped particle, just as a single dimension cannot describe the shape of a cylinder. The equivalent volume sphere diameter: is the diameter of a sphere having the same volume as the particle ( ). The surface-volume mean diameter is the diameter of a sphere having the same surface to volume ratio as the particle. Shape Sphere Cube Cylinder Cone Dimensions Radius Side length Radius and height Radius and height 3 6 p p V D
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 6 Qualitative Terms Used to Describe the Size of Bulk Solids Descriptive Term Typical Size Range Coarse solid 5-100 mm Granular solid 0.3-5 mm Particulate solid: coarse powder fine powder superfine powder ultrafine powder 100-300 m 10-100 m 1-10 m < 1 m
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JUST Department of Chemical Engineering ChE 362 Unit Operations Chapter 1- 7 Some Familiar Methods of Size Analysis Method
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