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Test work and demonstrations involving the determination and application of standard bulk solid properties will be conducted during this lab session.

18 / 01 / 2019 Mechanical engineering

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Test work and demonstrations involving the determination and application of standard bulk
solid properties will be conducted during this lab session. This will include flow properties
(e.g. compressibility, wall friction) and the processing of flow property data. Observe each
experiment and record all relevant data. Complete any additional items requested below.
Submit your completed Worksheet with any additional sheets of paper. Note: refer to the
Subject Coordinator for submission requirements and other relevant information (e.g. late
penalties, attendance, etc.); repeat test/s may be pursued (depending on time, etc.).
(i) Bulk Solid Compressibility (25 Marks)
Bulk Solid: ………….………. Test Date: ………….……… Cell Diameter: 63.5 mm I.D.
Gross Mass 1: …..…………g Tare Mass: …..…………g Sample Mass 1: …..…………g
Gross Mass 2: …..…………g Tare Mass: …..…………g Sample Mass 2: …..…………g
Test
No.
Total Mass on
Sample (kg)
Indicator Reading
(inches)
Computed Normal
Stress (kPa)
Computed Bulk
Density (kg/m3)
1 0.12
2 0.62
3 1.12
4 2.12
5 4.12
6 8.12
7 16.12
Take the above data, and determine the constants A and n in the bulk density relationship:
n
o
1 A 





   , where o is a constant (usually 5.939 kPa) (1)
A and n can be determined by fitting an appropriate trendline in Excel. Produce a plot
showing the variation of bulk density,  (ordinate) with major consolidation stress, 1
(abscissa), indicating both experimental data points and the curve representing Eqn. (1).
(ii) Wall Yield Locus and w Determination (25 Marks)
The wall friction between the bulk solid and hopper lining material plays a major role in
determining the appropriate hopper geometry (half angle and bin outlet dimension) and
hence is a parameter of considerable importance. You are required to collect data on the
wall friction for a range of normal loads for a specific wall material, plot the corresponding
WYL and, using the relationship for  provided by laboratory staff, determine the
relationship between 1 and w.



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