# 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 2 of 2.

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.
(1)

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

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.

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

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

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