A pump is used to transport water to a higher

Stacie Worsley 2021-12-18 Answered
A pump is used to transport water to a higher reservoir. If the water temperature is 20C, determine the lowest pressure that can exist in the pump without cavitation.
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Expert Answer

Suhadolahbb
Answered 2021-12-19 Author has 32 answers
In this problem, a pump is operating to transport water at temperature is (20°C), we can expect the lowest pressure that can exist in the pump without cavitation as followingю
Cavitation is the phenomenon, which is a common cause for drop in performance and even the erosion of impeller blades, when the pressure during liquid flow system drop below the vapor pressure at some locations, and it resulted in unpredictable vaporization for the liquid, Cavitation bubbles collapse because the are move from the low-pressure regions, producing a high destructive pressure waves which damage the propeller.
So, to prevent cavitation from occurrence, the pressure of the flow should be above the vapor pressure at the condition temperature.
At the given condition ( 20°C ) From TABLE (A-4):
Pv=Psat=2.3392kPa
So, the minimum pressure that can exist in the pump to avoid cavitation occurrence at any position on the pump surface should not be allowed to drop below Pv=Psat=2.3392kPa

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Neil Dismukes
Answered 2021-12-20 Author has 37 answers
Step 1
Cavitation is the phenomenon which causes drop in performance or erosion of impeller blades, when the pressure during liquid flow system drop below the vapor pressure at some locations.
Step 2
To prevent cavitation, the pressure of the flow should be above the vapor pressure at given temperature.
Hence, at 20°C, the saturation pressure is,
Psat=2.3392kPa
Answer
The minimum pressure that can exist in the pump to avoid cavitation to occur, should not be dropped below 2.3392 kPa, in the given case.

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