Particle Density

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About This Presentation

This is a comprehensive presentation on particle density. A fundamental property in bulk solids handling.
Link to file : https://drive.google.com/open?id=1nXy3um5XY0HtGkOWlUdvXjbR6Gwk3eOR

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Language: en

Added: Sep 20, 2019

Slides: 4 pages

Slide Content

What is particle density ?
For non-porous
particles
Particle density is the ratio of mass of
particle and the volume of the particle.
solid material
volume
closed pore
volume
external
void volume
interparticle
void volume
open pore
volume
For porous particles
Particle densityorTrue densityof
aparticulate solidorpowder, is the density
of the particles that make up the powder.
Density definitions
Volumesincluded in definition
Solid
material
volume
Open
pore
volume
Closed
pore
volume
Inter-
particle
void
volume
External
void
volume
Absolute powder density (BSI)
Theoretical density (ASTM)
True density(BSI)
Apparent particle density (BSI)
Skeletal density (ASTM D3766)
Effective particle density (BSI)
Envelope density(BSI)
Envelope density(ASTM D3766)
illustration of different volume types
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p)=
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Hydrodynamic volume is the volume ’seen‘
by the ﬂuid in its ﬂuid dynamic interaction
with the particle and includes the volume of
all the open and closed pores
Particle density is the ratio of mass of
particle and the hydrodynamic volume of
the particle
Introduction to Particle Technology
by Martin Rhodes
X
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What is it’s significance ?
1.Used in modelling of solid friction factor
2.Causes increase in pressure difference in
fluidized bed
3.Effects terminal velocity of particle
4.Effects minimum fluidization velocity
5.Effects the choking velocity in pneumatic
conveying
6.For a fixed particle size the fluidization
characteristics depend on the particle density
of the bulk solid.
Geldart(1973) classification diagram
How to measure it ?
Water displacement method :
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Standard :ASTM C 693
particle density measurement in lab

Measuring Principle :
It is a manual method in which the density is
determined by calculating finding the volume occupied
by a sample of known weight. After placing the sample
in the pycnometer, it is filled with distilled water and
then closed by a stopper with a capillary hole in it
which allows the spare liquid to leave. Thus providing
an accurate volume and density.
water pycnometer
Standard : ASTM D854 –14, DIN EN 725-7
How to measure it ? Contd…
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Measuring Principle :
The true volume of a solid is calculated from the measured drop in pressure
when a known amount of gas is allowed to expand into a chamber containing
sample. Thus including any pore volume accessible to the gas.
Standard : ASTM D5550-06Make/Model : Micrometrics : AccupycII 1340
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gas pycnometer

mercury porosimeter
Measuring Principle :
The mercury porosimetryanalysis technique is based on the intrusion of mercury into a porous
structure under stringently controlled pressures. Besides offering speed, accuracy, and a wide
measurement range, mercury porosimetrypermits you to calculate numerous sample properties
such as pore size distributions, total pore volume, total pore surface area, median pore diameter
and sample densities (bulk and skeletal).
Standard : ISO 1183-1:2004,ASTM D854Make/Model : Micrometrics : AutoPoreV
How to measure it ? Contd…
mercury intrusion into pore
space as pressure increases
intrusion volume vs pressure Summary of AutoPoreV Report
Envelope volume
interparticle
void volume
skeletal volume