Question

Which of the following is true?

(a) the slope of EGL will always be greater than that of the axis of the pipe

(b) the slope of EGL will always be smaller than that of the axis of the pipe

(c) the slope of EGL will always be equal to that of the axis of the pipe

(d) the slope of EGL will always be independent of that of the axis of the pipe

The question was posed to me in my homework.

My query is from Hydraulic Gradient and Total Energy Line in division Flow Through Pipes of Fluid Mechanics

Answer 1

Right option is (d) the slope of EGL will always be independent of that of the axis of the pipe

The explanation is: EGL is obtained by plotting total head at various points along the axis of the pipe.

where H is the total head, P ⁄ γ  is the pressure head, z is the potential head, , and v^2 / 2g is the velocity head.

Hence, there is no relation whatsoever between the slope of EGL and that of the axis of the pipe.