Concept explainers
Consider Problem 6.15 with the nozzle directed upward. Assuming that the flow is uniform at each section, derive and plot the acceleration of a fluid particle for an inlet speed of Vi = 2 m/s. Plot the pressure gradient through the nozzle and find its maximum absolute value. If the pressure gradient must be no greater than 7 MPa/m in absolute value, how long would the nozzle have to be?
A nozzle for an incompressible, inviscid fluid of density ρ = 1000 kg/m3 consists of a horizontal converging section of pipe. At the inlet the diameter is Di = 100 mm, and at the outlet the diameter is Do = 20 mm. The nozzle length is L = 500 mm, and the diameter decreases linearly with distance x along the nozzle. Derive and plot the acceleration of a fluid particle, assuming uniform flow at each section, if the speed at the inlet is Vi = 1 m/s. Plot the pressure gradient through the nozzle, and find its maximum absolute value. If the pressure gradient must be no greater than 5 MPa/m in absolute value, how long would the nozzle have to be?
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