Question

Steady Flow Energy Equation help please?
Steam enters an adiabatic nozzle at a speed of 20 m s-1, a temperature of 600C and
pressure of 10 bar absolute. It exits at 400C and 1 bar absolute.
(i) What is the exit speed?

Answer 1

we have to apply the Theorem of Bernoulli for gases. So we can write:
\[\Large \frac{{v_2^2 - v_1^2}}{2} = \frac{{{I_1} - {I_2}}}{A}\]
where:
\[\Large \begin{gathered}
{I_1} - {I_2} = {\text{difference of enthalpy}} \hfill \\
A = {\text{cross sectional area of the nozzle}} \hfill \\
\end{gathered} \]

Answer 2

the relationship for enthalpy is:
\[\Large I = U + A \times p \times v\]
where:
\[\Large \begin{gathered}
v = {\text{specific volume = volume/mass of gas}} \hfill \\
U = {\text{internal energy/mass of gas}} \hfill \\
\end{gathered} \]

Answer 3

p is the pressure of the gas