Radial force in rotodynamic machine developed by rate of momentum change

Q.  The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________.
- Published on 16 Sep 15

a. journal bearing
b. radial thrust bearing
c. both a. and b.
d. none of the above

ANSWER: journal bearing

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    Discussion

  • Pankaj   -Posted on 06 Oct 15
    The impulse momentum equation is based on Newton's second law of motion. The energy transfer between the fluid and rotodynamic machine takes place according to the impulse momentum equation

    The absolute velocity 'V' of the fluid flowing in rotodynamic machine has three components in three mutually perpendicular directions.

    1. Axial component: It acts along the axis of rotor. The axial force in rotodynamic machine, which is developed by rate of change of momentum due to axial component, is taken care by the radial thrust bearings. It is finally transferred to casing.

    2. Radial component: It acts along direction of rotor. The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by journal bearings.

    3. Tangential or whirl component: It acts along the tangential direction of rotor.

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