5_21 - casing can be neglected the angular velocity of the...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Problem 5.21 Radial outflow spinning up The sketch shows an impeller with radial vanes in a flat-sided casing of radius R and height h . The impeller is mounted on bearings and is free to rotate without friction, but the casing is held stationary. Fluid of density enters the impeller via a pipe which has a radius small compared with R . The velocity in the pipe is purely axial, and the volume flow rate is steady at a value Q . (a) Show that if a torque T is applied to the impeller shaft, and frictional forces on the
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: casing can be neglected, the angular velocity of the impeller obeys the equation I d dt + R 2 Q = T where I = 2 R 4 h . (b) If the impeller is stationary at t = 0, and a constant torque T is applied at t ≥ 0, obtain (t) . Sketch (t) and compare with the corresponding solution for Problem 5.20. Why is a final steady state reached in this problem, and not in Problem 5.20? ANSWER...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern