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Tikrit Journal of Engineering Sciences (2017) 24(2) 51-60
Effect of Hydrodynamic Action in Peristaltic Pump of Blood Gases Analyzer ABL 555
|Ali Khaled Mohammed Ali|
|Mechanical Eng. Dept., Tikrit University, Iraq.|
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 the direction 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.
Keywords: Blood gases analyzer, hydrodynamic, peristaltic pump, Reynolds equation, convergence area, viscosity of blood, cylindrical roller bearings, blood film thickness.