Chemical Engineering - Mechanical Operations - Discussion
Discussion Forum : Mechanical Operations - Section 4 (Q.No. 26)
26.
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:
Po = ρ/ρN3 D5 : Power number
Re = ρ N D2/μ: Reynold's number
N is the impeller rotational speed, and D is the impeller diameter.
Po = ρ/ρN3 D5 : Power number
Re = ρ N D2/μ: Reynold's number
N is the impeller rotational speed, and D is the impeller diameter.
Discussion:
7 comments Page 1 of 1.
PARMINDER SINGH said:
1 year ago
Here, p is independent of velocity.
And re is proportional to velocity.
That means p is not a function of re, so option B is the correct answer.
And re is proportional to velocity.
That means p is not a function of re, so option B is the correct answer.
Fathima said:
3 years ago
I too agree, A is the correct answer.
Fathima said:
3 years ago
Po is inversely proportional to sqrt of Re. So, none of the above is the correct answer.
Nandini said:
5 years ago
The Correct answer is A.
At low Reynolds no, Nre<10, Power number is inversely proportional to Reynolds number.
And Nre>10000, Po is independent of Reynolds number.
At low Reynolds no, Nre<10, Power number is inversely proportional to Reynolds number.
And Nre>10000, Po is independent of Reynolds number.
Harry said:
5 years ago
The Correct Answer must be A.
SATYAJIT said:
6 years ago
The correct Answer should be A.
VIJAYKUMAR JATOTH said:
7 years ago
I think A is the correct answer.
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