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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 3
1.
The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that
a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Turbulent flow range of mixing speed is obtained for
Rei<10
10<Rei<104
Rei>104
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
For laminar flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)
Np = K(Rei)-1
Np = N2Di(Rei)-1
Np = K(Rei)
Np = KNDi(Rei)-2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
For turbulent flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei, is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)
Np = K(Rei)-1
Np = N2Di(Rei)-1
Np = K
Can't be correlated
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h-1, then the oxygen uptake will be
23 kg.h-1
less than 23 kg.h-1
greater than 23 kg.h-1
2.3 kg.h-1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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