Water flows through a two-dimensional diffuser having a 20° expansion angle as shown in the figure below. Assume that the flow in the diffuser can be treated as a radial flow emanating from a source at the origin O. (a) If the velocity at the entrance is 21 m/s, determine an expression for the pressure gradient along the diffuser walls. (b) What is the pressure rise between the entrance and exit? 2m Entrance Diffuser wall 7m Flow 20° Exit

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