Answer Posted / sonu singh

See whenever there is any motion , that motion is from higher energy to lower energy . This is also the case with fluid flowing through a pipe . But while flowing through there would be some losses like frictional losses. So net energy is reduced. So what we can do is that we can apply a bernaulli equation to know the flow as it represents the net energy or net head. Bernaulli requires pressure head and velocity head . So if the cross section of the pipe is same we can then the velociy head would be same and we can directly compare the pressure head and if cross section is different then we hav to calculate both pressure head and velociy head and also gravitaional head if needed. And then we can compare the total head and find that where ever the total head is less the flow is toward that side.

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