# 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:
19 comments Page 1 of 2.

Ganesh swain said:   1 decade ago
How equivalent diameter related to the mean velocity?

Afeefa said:   1 decade ago
I actually didn't understand this concept can you please elaborate.

Dumbi said:   1 decade ago
Is hydraulic mean depth, means hydraulic radius?

Pankaj said:   10 years ago
Hydraulic mean depth is flow area/wetted perimeter answer should be C.

Farrukh said:   10 years ago
Can any one explain it?

Shonimoni said:   9 years ago
The flow rate don't depend on diameter the change in velocity.

Munawar Karimi said:   9 years ago
Pressure and velocity of liquid depend upon the diameter of the pipe through which liquid flow.

If the diameter increase pressure will be high and velocity will decrease. In above case diameter is decrease so mean velocity will be high and pressure will also decrease.

Ashish said:   8 years ago
Please, someone explain it in detail.

Aniruddha said:   8 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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RAMRATAN said:   6 years ago
Can anyone explain the formula for this?
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