5.61 If viscosity is neglected, typical pump-flow results are shown in Fig. P5.61 for a model pump tested in water. The pressure rise decreases and the power required increases with the dimensionless flow coef-ficient. Curve-fit expressions are given for the data. Suppose a similar pump of 12-cm diameter is built to move gasoline at 20°C and a flow rate of 25 m³/h. If the pump rotation speed is 30 r/s, find (a) the pressure rise and (b) the power required.

5.61 If viscosity is neglected, typical pump-flow results are shown in Fig. P5.61 for a model pump tested in water. The pressure rise decreases and the power required increases with the dimensionless flow coef-ficient. Curve-fit expressions are given for the data. Suppose a similar pump of 12-cm diameter is built to move gasoline at 20°C and a flow rate of 25 m³/h. If the pump rotation speed is 30 r/s, find (a) the pressure rise and (b) the power required.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Water flows steadily from a nozzle into a large tank as shown below. The water then flows from the tank as a jet of diameter d. (a) Using the piezometer tube shown, determine the flow rate through the nozzle. (b) Using the flow rate determine the value d if the water in the tank remains constant. Viscous effects are negligible.
7. As shown in the figure below, a pump lifts water through a 100-mm diameter ductile iron pipe (friction factor f = 0.0251) from a lower to an upper reservoir. If the difference in elevation between the reservoir surfaces is 10m, and the pump performance curve is given by H = 15 - 0.1Q2, where H is in m and Q in L/s. (1) Determine the system head curve (relationship between TDH and Q) assuming the entrance and exit loss coefficients are both 1; (2) Estimate the flow rate through the system; (3) If the minimum NPSH for this case is 1.5m, determine the maximum height above the lower reservoir that the pump can be placed (assuming that the atmospheric pressure Pa=101 kPa, specific weight of water γ = 9.79 kN/m3, and the water vapor pressure Pv = 2.34 kPa).
As you have seen in lectures (and in Lab 3), the height above the pipe centre to which water rises in a piezometer is equal to the pressure head of the flow. Consider water flowing through a sudden contraction in a smooth pipe. If the flowrate in the pipe is 0.025 m³/s, predict the difference in the piezometer readings (Ah). D = 20 cm 5 m Ah D = 15 cm 5 m
Q. Determine the kinematic viscosity at the average temperature and determine the Reynolds number and type of flow using the data shown below and table values: Data obatined from a Reynolds Number test: Water temperature at the beginning of the experiment = 25 oC Water temperature at the end of the experiment = 30 oC The Volume of water collected in 25 seconds = 240 ml Pipe diameter, d= 10 mm. (use eq'n reynold's number, Re = VD/v
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Example 6.13 For the following functions in two-dimensional irrotational flow, determine the conjugate functions (a) y = m In r m cos 0 (b)
As shown in the figure below, a pump lifts water through a 100-mm diameterductile iron pipe (friction factor f = 0.0251) from a lower to an upper reservoir. If the differencein elevation between the reservoir surfaces is 10 m, and the pump performance curve is givenby H = 15 – 0.1Q2, where H is in m and Q in L/s.a. Determine the system head curve (relationship between TDH and Q) assuming theentrance and exit loss coefficients are both 1b. Estimate the flow rate through the systemc. If the minimum NPSH for this case is 1.5 m, determine the maximum height above thelower reservoir that the pump can be placed (assuming that the atmospheric pressure Pa=101 kPa, specific weight of water ? = 9.79 kN/m3, and the water vapor pressure Pv= 2.34 kPa).
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