Abstract

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Title:: Blood damage-based temperature field analysis of axial flow blood pump bearing

Author(s):: YANG Fan; YUN Zhong; HU Jiyu; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Keywords:: ; Keywords: blood pump bearing; critical blood damage; red blood cell; temperature field analysis; material

Abstract:: Abstract: In order to study the effects of temperature rise of blood pump bearing on the blood during the working process, a red blood cell damage mechanism is obtained by analyzing the mortality rate and testing the brittleness of red blood cells in flow cytometry, thereby determining the critical value of blood damage. The bearing friction contact surface is used to calculate the heat flux density, and WORKBENCH is used to simulate the whole of the blood pump bearing and the guide wheel. By analyzing the temperature field of the blood pump bearing, the temperature rises at different friction coefficients and rotational speeds are obtained. The experimental results show that the mortality rate of red blood cells rises with the increase of temperature, and that the number of red blood cell deaths has exceeded half when the temperature reaches 47 °C. The simulation results reveal that the temperature rise is related to the material selection, and the temperature rise of each material bearing is increased with the increase of rotational speed and friction coefficient. Therefore, the temperature rise can be reduced by reducing rotational speed or reducing the surface roughness of the contact surface between the shaft and the sleeve, so as to ensure the temperature of bearing is always lower than the critical value of blood damage.