Particle Technology

hindered settling

Problems 6.9

Question 1.5


The plot the settling curve; i.e. the height of the interface against time graph is shown below. Batch settling curve
Take a ruler and draw a line from the height determined in the previous part making a tangent to the settling curve plotted in Part (i). You have now obtained a settling curve for a uniform suspension of the concentration 6.7% by volume (marked in the pink line above). Note that settling rate is independent of vessel diameter (but depends strongly on suspension concentration), hence the settling curve obtained in a 1000 ml measuring cylinder will be the same as that obtained in a large process vessel.

The time at which the tangent to the curve, going through the height 12.6 cm, touches the settling curve is (minutes):

a) 0
b) 180
c) 220
d) 275

Hint Calculator Ready to move on

Home      Book download      Video solutions      Interactive problems      Problem solutions      Size Analysis Expert system