In this paper，a theoretical analysis is carried out about the influence of theouter peripheral edge effects of rotating disks on the flow between them，forthe purpose of obtaining an accurate performance of a disk friction pump. Theouter peripheral edge effects of rotating disks on which no available reportsexist，are caused by that the fluid pumped out from the passage between rotatingdisks is braked by the stationary parts which constitute a diffuser elementof the pump.The results of the theoretica1 analysis of the edge effects are summarized asfol1ows:(1) When the ratio of outer radius of rotating disks to disk clearanceincreases， the azimuthal velocity of fluid at the outer periphery of disksincreases and approaches half of that of disks.(2) On the periphery distant by a disk c1earance from the outer edge， thefluid inside the rotating disk passage does rigid body rotation and thatinside the stationary f1ow passage is almost at rest; The outer peripheraledge effects of disks vanish there. (3) The radial and axial flow is constituted by the linear superposition of twof1ows; namely the flow due to centrifugal force and Poiseui1le flow. Therefore，when the flow rate through the rotating disks increases，the f1ow dueto centrifugal force is swept away outside of disks and the edge effectsmanifest themselves weakly.
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