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Engineering and Tech / Fundamentals of Thermodynamcs 8 / Chapter 4 / Problem 79HP

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

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Pumps, Pipe and Channel FlowsConsider a water pump that

Chapter 4, Problem 79HP

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QUESTION:

Problem 79HP

Pumps, Pipe and Channel Flows

Consider a water pump that receives liquid water at 25°C, 100 kPa and delivers it to a same-diameter short pipe having a nozzle with an exit diameter of 2 cm (0.02 m) to the atmosphere at 100 kPa (see Fig. P4.79). Neglect the kinetic energy in the pipes and assume constant u for the water. Find the exit velocity and the mass flow rate if the pump draws 1 kW of power.

FIGURE P4.79

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QUESTION:

Problem 79HP

Pumps, Pipe and Channel Flows

Consider a water pump that receives liquid water at 25°C, 100 kPa and delivers it to a same-diameter short pipe having a nozzle with an exit diameter of 2 cm (0.02 m) to the atmosphere at 100 kPa (see Fig. P4.79). Neglect the kinetic energy in the pipes and assume constant u for the water. Find the exit velocity and the mass flow rate if the pump draws 1 kW of power.

FIGURE P4.79

ANSWER:

Solution 79 HP

Step 1 of 3

We are required to find the exit velocity and rate of mass flow in the pump.

Diameter of the pipe. $d=0.02$ m

Initial temperature is, $\ T=2{5}^{0}$ C

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