Question

Consider the stove analyses below for two candidate granular materials to be used in a mer. What is the uniformity Coenicient (U) of the material represented by the solid line? Copyright The Merw-Hill Coun d for writo display 99.99 99. 999.5 99 98 99 90 O 70 00 00 0 20 10 5 2 10S0.1 0.01 10.0 + Sieve Sure, mm 010 0 0 0 0 0

Answer 1

Answer 2

- # we have to calculate the uniformity coefficient (U) represented by solid line as shown in question From the figure of solid line Dio=10% parhicles are fine = 0.3 mm DGO = 60% particles are fince = 08mm We know that uniformity coefficient Cu = Dool Hence Cu = 08 - 2.67 03 Hence coefficient of uniformity (cu) = 2:67 for solid line e # Effective size of particles Copo) in dotted line smaller than the solid line an And we know that permeability (k). k=CP102 Ka Dio 2 (kdotted line <kgolid line) As permeability of solid line will be more than dotted line des explained. Therefore Head lors in case of solid line will be more than the dotted line Ý Head loss solid line > Head loss dotted line