Question: ( 2 5 points ) As shown in the figure, an incompressible Newtonian liquid with constant viscosity was transported in a circular pipe under laminar

(25 points) As shown in the figure, an incompressible Newtonian liquid with
constant viscosity was transported in a circular pipe under laminar flow. The whole system
was static initially. At time 0, the fluid started to move as a result of a pressure difference
of P applied for the length of L of the pipe. Write down the governing equation, initial
conditions and boundary conditions needed for calculating the velocity profile evolution
with time. No further deduction is needed.
( 2 5 points ) As shown in the figure, an

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