Using Isentropic Processes/EfficienciesHelium gas at
Chapter 6, Problem 158P(choose chapter or problem)
Helium gas at \(810^{\circ} \mathrm{R}, \ 45 \mathrm{\ lbf} / \mathrm{in} .^{2}\), and a velocity of 10 ft/s enters an insulated nozzle operating at steady state and exits at \(670^{\circ} \mathrm{R}, \ 25 \mathrm{\ lbf} / \mathrm{in.}^{2}\) Modeling helium as an ideal gas with k = 1.67, determine (a) the velocity at the nozzle exit, in ft/s, (b) the isentropic nozzle efficiency, and (c) the rate of entropy production within the nozzle, in \(\mathrm{Btu} /{ }^{\circ} \mathrm{R}\) per lb of helium flowing.
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