Chemical Engineering - Mechanical Operations - Discussion
Discussion Forum : Mechanical Operations - Section 2 (Q.No. 33)
33.
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
Discussion:
9 comments Page 1 of 1.
Veere said:
1 month ago
N2 is for laminar.
Mudit Tripathi said:
5 months ago
In the limit of high Reynolds numbers, the variation of power input with impeller rotational speed (N) is proportional to N^3.
Desai said:
3 years ago
N^3 is the correct Answer.
Dewa said:
5 years ago
Np=constant at high Reynolds number.
Hence, P N^3.
Hence, P N^3.
Arindom said:
7 years ago
The answer should be n3.
Prakash Dhanaraj said:
7 years ago
At Nre<10 (laminar) it is N^2.
At Nre>10000 (turbulent) it is N^3.
At Nre>10000 (turbulent) it is N^3.
(1)
Ankit said:
8 years ago
Yes, agree @Sangram.
Sangram said:
9 years ago
@Nagaraj.
No, at high Reynolds number power does not depend on the Reynolds number and its proportional to n^3.
No, at high Reynolds number power does not depend on the Reynolds number and its proportional to n^3.
Nagaraj said:
1 decade ago
power number = power/n^2 *d^3 *viscosity.
This at high Reynolds number so p is directly proportional to n^2.
This at high Reynolds number so p is directly proportional to n^2.
(1)
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