the effect of the particle size distribution on non-newtonian turbulent ...

Chapter 3 Experimental Work Page 3.18
3.5 OTHER MEASURED VARIABLES
3.5.1 Slurry Density
Slurry density and relative density are determined by performing <strong>the</strong> following steps.
1. A clean, dry one litre volumetric flask is weighed (M,).
2. The volumetric flask was filled with slurry from a tapping in <strong>the</strong> pipe wall on
<strong>the</strong> vertical section above <strong>the</strong> pump before it splits into <strong>the</strong> 80mm and 150mm
pipelines. The volume <strong>of</strong> slurry is approximately 990ml.
3. The flask plus slurry are weighed (Mz).
4. The flask is <strong>the</strong>n filled with water up to <strong>the</strong> graduated mark and weighed
(M3)·
5. The flask is emptied, filled with clear water and weighed again (M4)'
6. Steps 1-5 were repeated except that in step 2 slurry was taken from a tapping
in <strong>the</strong> horizontal test section.
The relative slurry density Sm is defined as:
Sm = __m_as.-s_o_f..."s_lurry--;=---sam_..:,p1,...e__
mass <strong>of</strong> equal volume <strong>of</strong> water
S.. is calculated using <strong>the</strong> above equation and slurry density is calculated from:
p = Sm P w •
(3.10)
(3.11)
Normally <strong>the</strong> use <strong>of</strong>tappings for sampling slurries is not a good procedure to follow however
in this particular case <strong>the</strong> following should be noted:
•
•
<strong>the</strong> slurry being tested was homogeneous;
<strong>the</strong> point at which slurry was tapped was from an area where <strong>the</strong> slurry had been well
mixed;
Slatter (1994) compared this method against samples taken from o<strong>the</strong>r points in <strong>the</strong>
pipe system and hopper and found no discrepancies.