Effect of hydrodynamic action in peristaltic pump of blood gases analyzer ABL 555
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Abstract
In this research, we studied the effect of hydrodynamic action in peristaltic pump of blood
gases analyzer ABL 555 which made by (Radiometer-Copenhagen), by using theories of
tribology and Reynolds equation on performance of blood film convergence area, we analyzing
the influence of theoretical model for peristaltic pump (consist of steeper motor and 4 cylindrical
bearings distributed on circular disc) rotating around capillary tube, by using (MATLAB R 2012b)
programing with numerical solution of finite difference method in 5 nodes element , we fined the
blood film thickness and the pressure on contact area grid ( consist from annual and axial lines)
, then influence of viscosity of blood on pressure generated in limited temperature of ambient
and velocity of motor , and flow rate of blood in tube.
The important conclusions appear that the rotating sliding movement of motor cause low
pressure (positive) while the rolling cylindrical rollers of bearings cause high pressure (negative)
which lead to push the blood in tube, that mean the direction of rotating blood opposite thedirection of rotating motor of peristaltic pump, also the viscosity of blood effect on velocity of
flow and the speed of motor with bearings, and the effect of blood film thickness effect on
pressure generated in tube.
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