Exercise: Fluid Flow

Questions for: Fluid Flow

The viscous nature of a non-Newtonian fluid
A:
remains constant with time and power input
B:
changes with the level of power input and/or the length of time during which the fluid is mixed
C:
is similar to that of a perfect gas
D:
is similar to that of water
Answer: B
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The SI unit for viscosity is
A:
kg.m-1.s-1
B:
kg.m-2.s-2
C:
kg.m-3.s-1
D:
kg.m-1.s-2
Answer: A
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In sparged mammalian cell bioreactors, the cell damage is caused because of
A:
shear stress arising during mixing of the cell culture fluid
B:
shear stresses arising from the breakup of bubbles at the liquid surface
C:
shear stresses between bubbles in foam at the liquid surface
D:
all of the above
Answer: A
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The viscosity of a fluid changes with either stirrer speed or mixing time. But when mixing ceases, the viscosity returns to its original state. This fluid is best described as
A:
newtonian
B:
rheopectic
C:
viscoelastic
D:
thixotropic
Answer: C
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In animal cell bioreactor, bubble damage can be minimized by
A:
the addition of a shear protectorant
B:
using a bubble free oxygen delivery system
C:
headspace aeration
D:
all of the above
Answer: D
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