Chemical Engineering - Fluid Mechanics - Discussion

What's the relation?

See the maximum theoretical suction lift for water is at 15 c is 34.

Now at 90 c, The vapour formation is taking place in water so cavitation takes place inside the pump and it lift less than the 34 ft so answer is 8.

Can anyone explain?

Not cleared with the solution. Please explain it.

Please anybody explain it.

Please explain the solution.

The pressure due to water should be more than the atmospheric pressure. Until and unless the pressure of water is more than atmosphere pressure pumping is possible.

1. In the first case, at 15 C, the water pressure is almost equal to the atmospheric pressure at 34 feet.

2. In the second case, at 90 C, the water pressure will be lesser than the atmospheric pressure at 34 feet. It means the height should be adjusted in such a way that the atmospheric pressure must equal the water pressure at 90 C.

Find the water pressure data from internet and calculate. As Div and I said, it will be lesser than 34 ft. But, according to my calculations, I got 24 ft. The number is wrong, but, I think, the approach is right.

Tb/Ta = (Pb/Pa)^1-Cv/Cp

1-Cv/Cp~0.65 for water.

90/15 = (rho*g*h2/rho*g*34)^0.65

h2~8

Nice work guys. Thank you all.

8 ft according to equation.