
Estimate the flow of water at 20° C.

Answer to Problem 6.103P
Explanation of Solution
Given information:
Both reservoirs are connected by cast iron pipes with sharp edged entrance and exit. Reservoir 1 is
The volumetric flow rate Q can be defined as below,
In above equation,
The steady flow equation between the reservoir 1 & 2 will be,
We know that,
The Reynolds’s number is defined as,
The friction factor can be determined by,
Assume that the water at
Assume that the wrought iron will have a roughness of,
Calculation:
Assume small pipe as (a) and the large pipe as (b).
First of all, the roughness ratio will be,
For pipe (a)
For pipe (b)
Loss co-efficient for pipe (a) will be,
Similarly for pipe (b),
By equating the volumetric flow for both pipes,
According to the steady flow equation between reservoir (1) & (2),
We know that,
Therefore,
To find
To find Reynolds’s number,
To find friction factor,
Similarly for pipe (b),
To find Reynolds’s number,
To find the friction factor,
Therefore, to find the absolute value of
To calculate the flow of water,
Conclusion:
The flow of water is equal to
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Chapter 6 Solutions
Fluid Mechanics
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