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An isentropic flow at section x has a velocity of 200 m/s and static enthalpy of 360 kJ/kg. Determine the flow velocity at a location y where the static enthalpy is half the value at x.

An isentropic flow at section x has a velocity of 200 m/s and static enthalpy of 360 kJ/kg. Determine the flow velocity at a location y where the static enthalpy is half the value at x. Correct Answer 447.2 m/s

For an isentropic flow, stagnation enthalpy remains constant. Stagnation enthalpy h0 = h + v2/2 is constant. So h1 + v12/2 = h2 + v22/2 v2 = √2(360,000 – 180000 + 40000/2) = 447.2 m/s.

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