Exercise: Fluid Flow

Questions for: Fluid Flow

Mixing in stirred tank reactors can
A:
be described as either laminar, transient or turbulent
B:
achieve turbulent conditions by increasing the stirrer speed
C:
induce laminar flow conditions by the addition of baffles
D:
all of the above
Answer: A
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A viscoelastic fluid is one in which the viscosity
A:
is constant regardless of the stirrer speed or mixing time
B:
changes during mixing but returns to its original state after mixing
C:
increases with increasing stirrer speed
D:
decreases with increasing stirrer speed
Answer: B
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A pseudoplastic fluid is one in which the viscosity
A:
is constant regardless of the stirrer speed or mixing time
B:
changes during mixing but returns to its original state after mixing
C:
increases with increasing stirrer speed
D:
decreases with increasing stirrer speed
Answer: D
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If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is
A:
newtonian
B:
pseudoplastic
C:
dilatant
D:
thixotropic
Answer: B
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Non-linear relationship between shear stress and shear rate exists in
A:
newtonian fluids
B:
non-newtonian fluids
C:
both (a) and (b)
D:
none of these
Answer: B
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