Effect of blade curvature on the hemolytic and hydraulic characteristics of a centrifugal blood pump

Ozturk, Caglar; Aka, Ibrahim Basar; Lazoğlu, İsmail

doi:10.1177/0391398818785558

Cited by 19 publications

(17 citation statements)

References 24 publications

(50 reference statements)

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“…In this study, we employed a previously developed CFD Model and this model was validated against previously published experimental study of the FDA centrifugal pump [4]. A commercial software (ANSYS Fluent 18.0, ANSYS Inc., Pittsburgh, PA, USA) was used to model the flow pattern inside the blood pump.…”

Section: Cfd Methods and Boundary Conditionsmentioning

confidence: 99%

“…However, hemolysis reduction is still a significant design challenge for blood pumps [2,3]. Even though the impeller geometry plays an essential role in the overall performance of a centrifugal blood pump [4], the volute structure is equally critical for assuring steady flow lines and good kinetic energy to potential energy conversion for achieving greater hydraulic performance and a lower hemolysis risk [5,6]. Moreover, the uniformity of the pressure distribution around the impeller is a crucial parameter for designing non-contact bearings for centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

“…The volute tongue region has been particularly studied in various engineering fields for improving the pump endurance, bearing life, noise reduction, magnetic levitation and the flow separation [7]. However, recent studies on rotary blood pumps have mostly focused on the impeller geometry and blade parameters to optimize the pump performance and minimize the blood damage risk [4,9]. To date, a few researchers have numerically investigated the hydraulic effect of volute parameters such as the volute tongue in rotary blood pumps [5], yet in these studies the effect of volute tongue position on the hemolytic characteristics is missing.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of volute tongue design on hemodynamic characteristics and hemolysis of the centrifugal blood pump

2021

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In the design of rotary blood pumps, the optimization of design parameters plays an essential role in enhancing the hydrodynamic performance and hemocompatibility. This study investigates the influence of the volute tongue angle as a volute geometric parameter on the hemodynamic characteristics of a blood pump. A numerical investigation on five different versions of volute designs is carried out by utilizing a computational fluid dynamics (CFD) software ANSYS-FLUENT. The effect of volute tongue angle is evaluated regarding the hydrodynamic performance, circumferential pressure distribution, the radial force, and the blood damage potential. A series of volute configurations are constructed with a fixed radial gap (5%), but varying tongue angles ranging from 10 to 50°. The relative hemolysis is assessed with the Eulerian based empirical power-law blood damage model. The pressure-flow rate characteristics of the volute designs at a range of rotational speeds are obtained from the experimental measurements by using the blood analog fluid. The results indicate an inverse relationship between hydraulic performance and the tongue angle; at higher tongue angles, a decrease in performance was observed. However, a higher tongue angle improves the net radial force acting on the impeller. The pump achieves the optimized performance at 20° of the tongue angle with the relatively high hydrodynamic performance and minor blood damage risk.

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Section: Cfd Methods and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of volute tongue design on hemodynamic characteristics and hemolysis of the centrifugal blood pump

2021

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“…A prior sensitivity analysis and literature review of pump design parameters revealed that these four geometric characteristics have a strong impact on blood pump performance: pressure generation, mean scalar stress, mean blood residence time in the pump domain, mean blood damage index, fluid forces on the impeller, and pump efficiency. [10][11][12] Table 1 identifies the geometric parameters and the range of values that were considered in the design of the centrifugal impeller. Figure 3 also displays these critical design parameters.…”

Section: Design Of Centrifugal Blood Pumpmentioning

confidence: 99%

Integrated long‐term multifunctional pediatric mechanical circulatory assist device

et al. 2020

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Thousands of babies are born each year with congenital heart defects that necessitate surgical intervention within the first few days-to-years of life. 1 A subgroup of these infants contend with complex cardiac defects and debilitating malformations of their heart chambers, valves, or connecting vessels. 2 Patients born with severe and multiple cardiac defects generally undergo multiple open-heart surgeries and are known to develop early onset congestive heart failure (CHF).

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“…Ghadimi et al 3 optimized the impeller and volute geometry of a typical centrifugal blood pump and used efficiency instead of hemolysis index as an objective function by coupling CFD with metamodel-assisted genetic algorithm. Ozturk et al 4 enhanced the hydrodynamic and hemolytic performance with a blade curvature compared to the straight-blade configuration of the blood pump by CFD. By using CFD methods, Mulholland et al 5 took a roller pump as the research object and discovered that reducing the amount of time two rollers simultaneously occlude the tubing will reduce the blood damage caused.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flow field and hemolysis index in axial flow blood pump by computational fluid dynamics–discrete element method

et al. 2020

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To fully study the relationship between the internal flow field and hemolysis index in an axial flow blood pump, a computational fluid dynamics–discrete element method coupled calculation method was used. Through numerical analysis under conditions of 6000, 8000, and 10,000 r/min, it was found that there was flow separation of blood cell particles in the tip of the impeller and the guide vane behind the impeller. The flow field has a larger pressure gradient distribution, which reduces the lift ratio of the blood pump and easily causes blood cell damage. The study shows that the hemolysis index obtained by the computational fluid dynamics—discrete element method is 4.75% higher than that from the traditional computational fluid dynamics method, which indicates the impact of microcollision between erythrocyte particles and walls on hemolysis index and also further verifies the validity of the computational fluid dynamics–discrete element coupling method. Through the hydraulic and particle image velocimetry experiments of the blood pump, the coincidence between numerical calculation and experiment is analyzed from macro and micro aspects, which shows that the numerical calculation method is feasible.

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Effect of blade curvature on the hemolytic and hydraulic characteristics of a centrifugal blood pump

Cited by 19 publications

References 24 publications

Numerical investigation of volute tongue design on hemodynamic characteristics and hemolysis of the centrifugal blood pump

Numerical investigation of volute tongue design on hemodynamic characteristics and hemolysis of the centrifugal blood pump

Integrated long‐term multifunctional pediatric mechanical circulatory assist device

Analysis of flow field and hemolysis index in axial flow blood pump by computational fluid dynamics–discrete element method

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