Reconsider Prob. 8-78. In order to drain the tank faster, a pump is installed near the tank exit as in Fig. 8-79. Determine how much pump power input is necessary to establish an average water velocity of 4 m/s when the tank is full at z = 2 In. Also, assuming the discharge velocity to remain constant, estimate the time required to drain the tank. Someone suggests that it makes no difference whether the pump is located at the begining or at the end of the pipe, and that the performance will be the same in either, case, but another person argues that placing the pump near the end of the pipe may cause cavitation. The water temperature is 30CC. so the water vapor pressure is P1. 4.236 kPa 0.43 m H 2 O, and the system is located at sea level. Investigate if there is the possibility of cavitation and if we should be concerned about the location of the plump.
Reconsider Prob. 8-78. In order to drain the tank faster, a pump is installed near the tank exit as in Fig. 8-79. Determine how much pump power input is necessary to establish an average water velocity of 4 m/s when the tank is full at z = 2 In. Also, assuming the discharge velocity to remain constant, estimate the time required to drain the tank. Someone suggests that it makes no difference whether the pump is located at the begining or at the end of the pipe, and that the performance will be the same in either, case, but another person argues that placing the pump near the end of the pipe may cause cavitation. The water temperature is 30CC. so the water vapor pressure is P1. 4.236 kPa 0.43 m H 2 O, and the system is located at sea level. Investigate if there is the possibility of cavitation and if we should be concerned about the location of the plump.
Solution Summary: The author explains the pump power input, the time required for draining the tank, and the energy equation.
Reconsider Prob. 8-78. In order to drain the tank faster, a pump is installed near the tank exit as in Fig. 8-79. Determine how much pump power input is necessary to establish an average water velocity of 4 m/s when the tank is full at z = 2 In. Also, assuming the discharge velocity to remain constant, estimate the time required to drain the tank. Someone suggests that it makes no difference whether the pump is located at the begining or at the end of the pipe, and that the performance will be the same in either, case, but another person argues that placing the pump near the end of the pipe may cause cavitation. The water temperature is 30CC. so the water vapor pressure is P1. 4.236 kPa 0.43 m H2O, and the system is located at sea level. Investigate if there is the possibility of cavitation and if we should be concerned about the location of the plump.
In Fig. is shown a plot of pump net head as a function of pump volume flow rate, or capacity. On the figure, label the shutoff head, the free delivery, the pump performance curve, the system curve, and the operating point.
Water is being pumped from a reservoir to the top of a hill, where it is discharged, as shown in Fig. 20-21. Thepump, which is 70 percent efficient, is rated at 150 kW. Find the flow rate at which water is being dischargedfrom the pipe. Neglect minor losses.
1- Write what you now about Bernoulli's equation and why it is very important in our life
2- A large tank open to the atmosphere is filled with water to a height of 5
`m from the outlet tap. A tap near the bottom of the tank is now opened,
and water flows out from the smooth and rounded outlet. Determine the
maximum water velocity at the outlet.
3- Define Reynolds Number, and discuss why it important in water
distribution system.
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