Transcription of PARTICLE SIZE ANALYSIS - Birla Institute of Technology, Mesra
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PARTICLE SIZE ANALYSIS - Birla Institute of Technology, Mesra
PARTICLE SIZE ANALYSIS1 CHARACTERIZATION OF SOLID PARTICLES SIZE SHAPE DENSITY2 SPHERICITY, Equivalent diameter, Nominal diameter = Let = , = , = = = 6 3 Surface area of the sphere of diameter Dp, = 2=6 = =6 It is often difficult to calculate volume of PARTICLE , to calculate equivalent diameter, Dpis taken as nominal diameterbased on screen ANALYSIS or microscopic analysis3 Sphericityof particles having different , length = to , Table , McCabe Smith Sphericityof sphere, cube, short cylinders(L=Dp) = 15 VOLUME SHAPE FACTOR 3 = 3 Where , a = volume shape factorFor sphere, = 6 3or = 66 Commonly used measurements of PARTICLE size7 PARTICLE size/ unit
sticky material, semisolid materials, boiler ash. Etc. –Continuous spiral for dry granular free flowing material –Discontinuous spirals for wet, muddy and thick materials. –Short distance upto about 40m –Types of flow : •Archemedian flow or •Plug flow –Unit operation –mixing, heating & cooling with hollow shaft 28
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