Published on：2015-2-9 9:57:14 Hits：
When out of the flow of basic equation (1,34) and (1,35), in order to simplify, the whole cross section of the catheter will be assumed as constant velocity distribution.
In fact, the distribution of velocity in the duct cross-section is varied. This is due to the friction of the friction wall and the fluid to flow through the fluid at different speeds between the particles caused.
Assumed that the viscous fluid in the vessel (FIG. 10) is stationary, while moving a flat plate in which the (flat wall). When the plate moves fluid particles also brought their lead, and move in a fluid layer flat side of the plate at a speed of. The farther away from the plate, were cited with smaller rate of fluid layer. Decrease the speed of the straight line is actually carried out.
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