Concept explainers
Whether the device is a pump or a turbine.
Answer to Problem 1P
The device is a pump.
Explanation of Solution
Pump: It is defined as a machine or device which is used to force a fluid to move in a given direction. In the case of pump, the work is done on the fluid.
Turbine: It is defined as a
Draw the velocity diagram for the given figure.
Figure-(1)
Write the expression for the linear velocity of the blade at inlet.
Here, the radius of the blade at inlet is
Write the expression for the linear velocity of the blade at exit.
Here, the radius of the blade at outlet is
Since, the angular velocity is remains constant at inlet and outlet, only the radius is different. The outlet radius is greater than the inlet radius. Hence, the exit velocity is also greater than the inlet velocity. Due to this the direction of absolute velocity is changed from
Therefore, the work is done on the fluid by the device hence the device is a pump.
Conclusion:
Thus, the device is a pump.
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Chapter 12 Solutions
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