The flow rate between tank A and tank B is to be increased b

The flow rate between tank A and tank B is to be increased by a factor alpha (from Q to alpha Q) by the addition of a second pipe (dotted lines) running from point C to tank B. If the elevation of the free surface in tank A above that of tank B is h, determine the diameter d of this new pipe. Neglect minor losses and assume that the friction factor for each pipe is f.

Solution

From above given data

We have to apply bernoullis to calculate the diameter at water surface level ,= 45mm