# Chemical Engineering - Fluid Mechanics - Discussion

Discussion Forum : Fluid Mechanics - Section 1 (Q.No. 6)
6.
Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
flow rate
mean velocity
both 'a' & 'b'
neither 'a' nor 'b'
Explanation:
No answer description is available. Let's discuss.
Discussion:
18 comments Page 1 of 2.

Gauarv shakya said:   9 months ago
Mean depth= Area of the channel/wetted perimeter.
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BANKE BIHARI said:   1 year ago
Hydraulic mean depth = cross-section are/top width of flow.
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Abiyot mihret said:   4 years ago
Not understanding, Because it is not defined between mean diameter, flow rate, velocity.
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Arsh siddique said:   4 years ago
Can anyone explain it in details that what is hydraulic mean depth and mean velocity. Please, I don't understand.

Sneha said:   5 years ago
Clearly explain what is mean velocity and when pressure increases velocity decreases but it is how related to mean velocity?

Anand said:   5 years ago
@Harry.

Mean velocity is average velocity. For laminar flow, it is glf of the max velocity. Then coming to pressure, as pressure increases max velocity decreases so as average velocity also decreases.

Harry said:   5 years ago
Clearly explain what is mean velocity and when pressure increases velocity decreases but it is how related to mean velocity?

Sharmi said:   5 years ago
Please explain me clearly.
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RAMRATAN said:   5 years ago
Can anyone explain the formula for this?
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Aniruddha said:   7 years ago
It explains critical flow characteristics for flow past an irregular surface domain. Hydraulic mean radius is different from the hydraulic radius. This answer is correct. Chemical engineers don't have to deal with this, it is effectual in HYDRAULICS section of CIVIL engineering.
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