Performance of a viscous pump with radial pumping grooves at low speeds (c)

A disk-type viscous pump with radial pumping grooves on its stator has been shown to have a linear pressure-flow rate relationship. However as recentl y reported, at high rotor speeds (ranging from 600 to 1800 rpm), its pressu re-flow rate relations are no longer linear due to the increase of the work ing fluid temperature during its operation. For this reason, a prototype of such a pump has been rested at relatively low rotor speeds ranging from 50 to 500 rpm. Comparisons between the experimental results and the analytica l predictions show very good agreement, especially for the lower rotor spee ds which confirm the linearity and accuracy of the derived pressure-flow ra te relation.