The characteristics of the boundary layer for mechanical seal applications-

The characteristics of the boundary layer for mechanical seal applications

　2017-03-04　　

The characteristics of the boundary layer for mechanical seal applications

(1) The velocity gradient along the normal direction is relatively large, and the velocity from the zero value of the wall surface quickly approaches the velocity of the external potential flow along the wall normal direction;

(2) The normal pressure along the wall is constant, so the pressure on the wall obtained by the ideal fluid can be regarded as the pressure in the boundary layer;

(3) Inertial force and viscous force are of the same order of magnitude, neither of which can be ignored;

(4) The flow is a swirling flow;

(5) The flow state can be laminar flow or turbulent flow, or a mixed flow of laminar flow and turbulent flow.　　323.html,

Boundary layer of mechanical seal (with surface layer) flow 　　 transition of boundary layer of mechanical seal application