Define nozzle efficiency.

Q.  The nozzle efficiency can be defined as the ratio of
- Published on 16 Sep 15

a. isentropic enthalpy drop to actual enthalpy drop
b. actual enthalpy drop to isentropic enthalpy drop
c. isothermal enthalpy drop to isentropic enthalpy drop
d. isentropic enthalpy drop to isothermal enthalpy drop

ANSWER: actual enthalpy drop to isentropic enthalpy drop

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    Discussion

  • Pankaj   -Posted on 13 Oct 15
    In steam nozzle, the wall friction is small in convergent portion as compared to divergent portion. The friction losses in the nozzle depend upon the type of material, size, shape, properties of the fluid and flow conditions is nozzle.

    The nozzle efficiency can be defined as the ratio of actual enthalpy drop to ideal (isentropic) enthalpy drop in nozzle.
    Therefore,

    Nozzle efficiency, ηn = (Actual enthalpy drop) / (isentropic enthalpy drop)

    ηn = (h1 – h2) / (h1 – h'2)

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