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# The analysis of a propeller that operates in water at 20°C

ISBN: 9780071284219 39

## Solution for problem 21P Chapter 2

Fluid Mechanics | 2nd Edition

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Problem 21P

The analysis of a propeller that operates in water at 20°C shows that the pressure at the tips of the propeller drops to2 kPa at high speeds. Determine if there is a danger of cavitation for this propeller.

Step-by-Step Solution:

Step 1:

Temperature of water T = 20°C or 293.15 K

Pressure at the tips of the propeller Ptip = 2 kPa

To determine if there is a danger of cavitation for this propeller at the pressure given temperature

Step 2:

The vapour pressure of water may be approximated by

Psat = exp (20.386 - )

Here Psat  in mm Hg and T in kelvin

Step 3:

Psat = exp (20.386 - )

Psat = 17.81 mm Hg

Step 4 of 5

Step 5 of 5

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The analysis of a propeller that operates in water at 20°C

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