Study on modeling test method and the critical Reynolds number of a micro centrifugal pump

Abstract

In order to test the performance of the micro centrifugal pump and carry out performance analysis by using water instead of blood as the test medium, a modeling test method of the micro centrifugal pump was proposed in this paper. Dimensional analysis method was applied to study the dimensionless characteristic number of the micro centrifugal pump. The SST (Shear Stress Transport) k-ω model was used to simulate the flow in the prototype pump and model pump. The correctness of the similarity theory and modeling schemes was verified. The performance of the micro centrifugal pump for transporting water and blood was studied under the same working conditions, and the effect of Reynolds number on the performance of the micro centrifugal pump was discussed. The external characteristics of similar pumps can be converted to each other. For similar pumps under different modeling schemes, the pressure and velocity at the corresponding position is proportional. When the micro centrifugal pump that transports blood operates at low rotational speed and low flow rate, the performance of the micro centrifugal pump will change dramatically. The critical Reynolds number of the micro centrifugal pump is determined to be 1200. The similarity criterion between the prototype pump and model pump was established. The modeling schemes of the micro centrifugal pump were formulated. The critical Reynolds number of the micro centrifugal pump was determined. The research results provide a new method for the performance test of the micro centrifugal pump transporting blood.