Reconsider Prob. 14-74. In order to drain the tank faster, a pump is installed near the ta...

Reconsider Prob. 14-74. In order to drain the tank faster, a pump is installed near the tank exit as in Fig. P14-75. Deter mine 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 m. Also, assuming the discharge velocity to remain constant, esti mate the time required to drain the tank.

Someone suggests that it makes no difference whether the pump is located at the beginning 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 30°C, so the water vapor pressure is P_v = 4.246 kPa = 0.43 m-H₂0, 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 pump.

FIGURE P14–75: