Computational fluid dynamics is an essential tool for the flow field analysis of blood pump. The interface processing method between dynamic/static regions will affect accuracy simulation results, but its influence on results still unclear. In this study, axial-flow pump was taken as research object, and effects mixing plane, frozen rotor, sliding mesh methods following were compared: flux conservation at interface, hydraulic characteristics, velocity distribution. parallel, particle image...

Current researches show that the constant speed mode adopted by existing commercial blood pump may cause damage to body. The way solve this problem is produce pulsating flow changing of pump’s impeller. But at present, field not clear, when it changes speed, and coupling between body has been considered in simulation field. A multiscale model combining hemodynamics (0D) Computational Fluid Dynamics (3D) was established paper problem, a change curve consistent with ventricular motion...

To fully study the relationship between internal flow field and hemolysis index in an axial blood pump, a computational fluid dynamics–discrete element method coupled calculation was used. Through numerical analysis under conditions of 6000, 8000, 10,000 r/min, it found that there separation cell particles tip impeller guide vane behind impeller. The has larger pressure gradient distribution, which reduces lift ratio pump easily causes damage. shows obtained by dynamics—discrete is 4.75%...

Shear stress is often present in the blood flow within blood-contacting devices, which leading cause of hemolysis. However, simulation method for with shear still not perfect, especially multiphase model and experimental verification. In this regard, study proposes an enhanced discrete phase stress. This based on (DPM). According to characteristics blood, a virtual mass force pressure gradient influence are added calculation cell particle motion. verification, nozzle models were designed...

The blood pump is an implantable device with strict performance requirements. Any effective structural improvement will help to improve the treatment of patients. However, research structure a complex optimization problem multiple parameters and objectives. This study takes splitter blade as object improvement. Computational fluid mechanics neural networks are combined in optimization. And hydraulic experiments micro particle image velocimetry technology were used. In study, number blades,...

The splitter blade can effectively optimize pump performance, but there is still insufficient research in blood pumps that cover both hydraulic and hemolysis performance. Thus, the aim of this study was to investigate effect key factors related on performance flow field axial pump. In study, number blades, length, circumferential offset were chosen as three objects study. An analysis by orthogonal array design using computational fluid mechanics carried out. A set particle image velocimetry...

The blood pump is a medical device used to assist or replace the diseased heart. Research on structure of pumps has been committed achieving better hemolysis and hydraulic performance. purpose this study was find some effective ways improve design methods structures. research contents improvement include: (1) improved blade streamline method; (2) conical impeller hub; (3) additional auxiliary blades. Characteristic analysis parameter were carried out above three aspects. in included Dynamics...

Taking the axial flow blood pump as research object, we used particle image velocimetry (PIV) to measure distribution of inlet, outlet and impeller at changing rotation speed. Effects acceleration deceleration process on change internal field were compared analyzed. The experimental results show that inlet area is stable constant working speed, but vortex reflux exist in area. However, increases field's volocity disturbance. Deceleration speed reduces velocity, state overall relatively...

Implantation of the blood pump is an important method to treat heart failure (HF) at present. Many studies have shown that pressure waveform produced by constant speed rotary lacks fluctuation, which may cause a series body damage. Therefore, it believed beneficial for produce higher fluctuation rapidly adjusting pump, but how set parameters in big challenge. The purpose this study obtain regularity pump’s changing on hemodynamics. In study, lumped parameter coupling model and cardiovascular...

Hemolysis in blood-contacting devices severely affects the health of users, and computation fluid dynamics (CFD) simulation is a crucial method for hemolysis analysis. Medical equipment has high requirements accuracy. Modification turbulence model one most effective ways to improve efficiency. In this study, we designed nozzle models simulate hemolytic shear flow, varying degree flow through different orifice sizes. The study acquires microscopic results Particle Image Velocimetry (PIV)...

Abstract Background: The splitter blade is an improved structure effective in traditional pumps. However, applying blades to blood pumps a complex optimization problem with multiple parameters and objectives, because structural parameters, circulation dynamics, damage need be considered simultaneously. This study aims obtain the performance impact of make it well used through CFD neural networks. Results: combines And hydraulic experiments PIV technology were used. In study, number blades,...