抄録
A testing apparatus for study and evaluation of the effebcts of fluid dynamic shear stress on hemolytlc property blood under the real Reynolds number conditions for rotary blood pumps has been developed. This paper aims at clarifying the fluid dynamic characteristics of the apparatus that consists of afixed inner cyhnder and a rotating outer container forming a vertical cylindhcal gap and two horizontal conical gaps at the top and the bottom. On the basis of the Rayleigh-Taylor's analytical criterion, it is proved that the fluid driven only by the outer container does not develop centhfugal instabihties in the vertical gap. Therefbre, all the dynamics of the fluid is governed by phenomenon in the hohzontal gaps. As the cone angle is small, a deschption based on the rotating disk theory is apphcable fbr the dynamics in the conical gaps. An experimental investigation utiizing two hquids revealed that the flow sustains simultaneously laminar and turbulent regions and there is a chtical Reynolds number corresponding the spatial boundary that moves with the rotational speed.
