Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Water is lifted from a lower reservoir to a higher reservoir by a pump that provides 23 kW of power. The water is being pumped at a rate of 0.03 m^3/s with a velocity V = 1 m/s through the closed conduit connecting the two reservoirs. Accounting for the loss at the submerged discharge at the higher reservoir, determine the friction head loss along the length of the conduit.
A reservoir discharges through a steel pipeline, which is 910 mm diameter, 2500 m
long and has wall thickness 32 mm. Water is flowing along the pipe at a steady mean
velocity 2.5 ms!.
(a) Calculate the speed of water hammer waves in the pipe.
(b) Calculate the rise of pressure which would occur if the flow through the pipe were
reduced rapidly to zero due to a failure of the turbine at the downstream end of the
pipe.
(c) Describe the sequence of events which follows this sudden closure, giving the
times and pressure where appropriate, assuming that cavitation does not occur and
neglect any other friction losses.
In a wide rectangular channel with uniform flow
the specific energy is 1.08 m. What is the velocity
at critical flow? (Given √2g = 4.43)
Chapter 13 Solutions
Sustainable Energy
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- A hydraulic jump takes place in a 6 m wide rectangular channel at a point where the upstream depth is 0.5 m (just before the jump). If the discharge in the channel is 30 m³/s and the energy loss in the jump is 1.6 m, then the Froude number computed at the end of the jump is (round off to two decimal places) (Consider the acceleration due to gravity as 10 m/s².) ..arrow_forwardWater is flowing in a 3 m wide rectangular channel. A hydraulic jump occurs and the flow upstream is 360 mm deep while the flow downstream from the jump is 1300 mm deep. A) Find the discharge flowing in the channel. B) Find the energy absorbed by the jump in kW. Please answer correctlyarrow_forwardof a .If the sequent depth equal to1.7m, and the energy dissipated =0.5g m kg hydraulic jump in a rectangular canal, what's the length of the jump?arrow_forward
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- Water is flowing in a 90° triangular channel at a depth of 39 cm. A hydraulic jump occurs. The depth after the jump is 126 cm. a. What is the discharge?b. What is the decrease in specific energy caused by the jump?c. What is the head loss in kW?arrow_forwardWater discharging into a 6 m wide rectangular horizontal channel from a sluice gate is observed to have undergone a hydraulic jump. If the flow depth and velocity before the jump are 0.5 m and 8 m/s, respectively, then which of the following statements is/are true? A Flow depth after the jump is 2.31 m. B Hydraulic jump formed is a weak jump. C Efficiency of jump is 65.6%. D Relative energy loss is 0.824.arrow_forwardQ(1): A horizontal rectangular stilling basin is used at the outlet of a spillway to dissipate energy. The spillway discharges 13m'/s and has a uniform width of 12m. At the point where the water enters the basin, the velocity is 10m/s, compute: • The sequent depth of the hydraulic jump, The length of the stilling basin, • The energy loss in the jump, • The efficiency of the jump (the ratio of specific energy after to the specific energy before the hydraulic jump, • If the thickness of the basin is 0.75m, and the sieve analysis for the site soil indicate the d50 is 0.05mm, are the requirements of scour design satisfied or not?arrow_forward
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