Coriolis effects on torque transmission of hydro-viscous film in parallel disks with imposed throughflow

- The analytical expressions for flow parameters of rotating thin-film with imposed throughflow are obtained.
- The influence of Coriolis force on torque is studied theoretically and validated experimentally.
- The tangential Coriolis force serves as significant resistance to the hydro-viscous torque transmission.
- The balance between throughflow rate and Coriolis torque should be controlled in the practical designs and applications.

The imposed throughflow into rotating parallel disk system is to decrease temperature rise of hydro-viscous film flow, but the induced Coriolis effects are usually underestimated on torque transmission. The analytical expressions of thin-film parameters are obtained based on Navier-Stokes equations with the method of approximate analytical iteration. The Coriolis force and the corresponding influence on torque transmission are analyzed by analytical calculation and experimental verification. The results show that the tangential Coriolis force serves as resistance to the viscous torque transmission and the Coriolis torque loss can lead to primary reduction of efficiency among all motion effects. Therefore, the Coriolis effects should be paid more attention for the practical designs and applications of rotating hydro-viscous parallel-disk systems with imposed throughflow.