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.
include a free body diagram
Seawater is to be pumped into a large tank at a rate of 165 kg/min. The tank is opwn to atmostsphere and the water enters the tank from a 80 m height. The overall efficiency of the motor pump unit is 75 percent and the motor consumes electricity at a rate of 3.2 KW. If the irreversible headloss in the piping is 7 m, the velocity of the water (in m/s) at the tank inlet isA. 6.21B. 7.12C. 8.7D. 5.05
A 3-m-high large tank is initially filled with water. The tank water surface is open to the atmosphere, and a sharp-edged 10-cm-diameter orifice at the bottom drains to the atmosphere through a horizontal 80-m-long pipe. The total irreversible head loss of the system is determined to be 1.5 m. Disregard the effect of the kinetic energy correction factors. Using appropriate software, investigate the effect of the tank height on the initial discharge velocity of water from the completely filled tank. Let the tank height vary from 2 to 15 m in increments of 1 m, and assume the irreversible head loss to remain constant. Tabulate and plot the results.
Seawater is to be pumped into a large tank at a rate of 165 kg/min. The tank is opwn to atmostsphere and the water enters the tank from a 80 m height. The overall efficiency of the motor pump unit is 75 percent and the motor consumes electricity at a rate of 3.2 KW. If the irreversible headloss in the piping is 7 m, the velocity of the water (in m/s) at the tank inlet is ( WITH FREE BODY DIAGRAM)
CHOICES:
A.7.12
B.6.21
C.8.7
D.5.05
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