Exercise: Fluid Flow

Questions for: Fluid Flow

The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
A:
the concentration of lactate in the medium
B:
the level of lactate oxidase activity in the medium
C:
the level of lactate dehydrogenase activity
D:
the level of lactase activity in the medium
Answer: C
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Reynolds number for laminar flow over a plate should be less than
A:
500 mm
B:
5 x 10-5
C:
5 x 105
D:
5 m
Answer: C
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A thixotropic 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 mixing time
D:
decreases with mixing time
Answer: D
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Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
A:
The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
B:
When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
C:
At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
D:
All of the above
Answer: D
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If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
A:
newtonian
B:
rheopectic
C:
viscoelastic
D:
thixotropic
Answer: D
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