Exercise: Fluid Flow

Questions for: Fluid Flow

A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
A:
2500
B:
100
C:
12,50,000
D:
1,000,000
Answer: C
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Pluronic F68 is added to cell culture media as
A:
a nutrient
B:
a shear protectorant
C:
to increase oxygen transfer rates
D:
all of these
Answer: B
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The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
A:
increases with stirring speed but decreases with mixing time
B:
increases with stirring speed and increases with mixing time
C:
decreases with stirring speed but increases with mixing time
D:
decreases with stirring speed and decreases with mixing time
Answer: D
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Animal cell cultures do not have much effect on shear forces because
A:
the cell size is generally smaller than the critical eddy size at which shear will have an effect
B:
cells are larger than the critical eddy size at which shear will have an effect
C:
animal cells have cell walls
D:
animal cells have cell membranes
Answer: A
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Which pattern of mixing is preferred in stirred tank reactors during the culture of aerobic microorganisms?
A:
Laminar flow
B:
Transient flow
C:
turbulent flow
D:
all of these
Answer: C
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