- #1

Karol

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## Homework Statement

Water flows in a horizontal venturimeter. the diameter is 100 mm, and the throat is 50 mm.

The pressure at the entrance is 0.65[bar].

What is the maximum throughput that is allowed so that the absolute pressure in the throat will not drop under 0.3[bar]

## Homework Equations

Bernoully equation:

[tex]H_1+\frac{V_1^2}{2g}+\frac{P_1}{\gamma}+H_P=H_2+ \frac{V_2^2}{2g} +\frac{P_2}{\gamma}[/tex]

## The Attempt at a Solution

The velocity V

_{2}in the throat:

[tex]V_2=V_1 \frac{0.1^2}{0.005^2}=4V_1[/tex]

Bernoully equation:

[tex]\frac{0.65E5}{1E5}+\frac{V_1^2}{20}=\frac{0.3E5}{1E5}+\frac{16V_1^2}{20}[/tex]

Which produces negative velocity.

Even if i use absolute pressures, the same. i use 1.65 instead of 0.65.