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Dredging operations in a river yield la
rge volumes of sediments whose sma
llest particle is measured to be c
oarse sand with a diameter of 4 mi
crons and whose largest particle i
s coarse sand with a diameter of 1
000 microns or 1mm.determine the s
ettling velocity for each size cla
ss.Gw=9764 N/m^3;Ssand=2.65;Sclay=
1.6;and the viscosity at 30 degree
celsius is 0.8*10D-3 N.s/m^2
Solution:
(i)For clay particles:
Assuming reynolds number less than 1
R1=
3.255D-08
Since reynolds number is less than 1,he
nce
Settling velocity for clay particles
0.0000065
m/s
(ii)For sand particles:
Assuming reynolds number greater than 1
and equal to 220 Cd=0.7
R2
219.41569
Since the reynolds number is greater th
an 1
Hence the settling velovity =
0.1755325
m/s
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