Cone Flow and Axial Flow Pumps

Anderson, Harold

doi:10.1016/b978-0-85461-076-1.50036-6

Cited by 5 publications

(10 citation statements)

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“…Rotary continuous flow blood pumps can be further classified into two categories: centrifugal and axial pumps. Considering pump design theory, centrifugal pumps are capable of producing higher pressures at lower flows, whereas axial flow pumps typically generate higher flows at lower pressure rises (Stepanoff 1957). Axial flow pumps, while they are far more compact than centrifugal pumps, operate at much higher rotational speeds to produce the desired pressure rise and flow.…”

Section: Continuous Flow Vadsmentioning

confidence: 99%

“…Via the motor configuration, the impeller receives energy for rotation and imparts energy to the fluid. The basic design formulae defining the impeller's blade shape and characteristics take the form of Newton's law of motion applied to fluid traversing a rotating impeller (Stepanoff 1957). Newton's second law states that the torque on the impeller is equal to the rate of change of the angular momentum of fluid.…”

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

“…Newton's second law states that the torque on the impeller is equal to the rate of change of the angular momentum of fluid. Equation (1) defines the torque (T ) as a function of the mass flow rate (m), the radii (r 1 and r 2 ) and the tangential absolute velocities (V u1 and V u2 ) (Stepanoff 1957). Derived from Euler's velocity triangles, equation ( 2) expresses the absolute fluid velocity (V ) as the sum of the relative velocity of fluid (W ) with respect to the moving blade and the blade velocity (U ).…”

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

“…The impeller geometry, including impeller tip and characteristic diameters, annular flow area, number of blade and inlet and outlet blade angles (β 1 , β 2 ) can be determined by the specific diameter based on empirical charts and formulae (figure 4). The impeller blades have shapes or profiles similar to those of airfoils: thin, cambered and streamlined (Stepanoff 1957).…”

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

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The medical physics of ventricular assist devices

et al. 2005

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Millions of patients, from infants to adults, are diagnosed with congestive heart failure each year all over the world. A limited number of donor hearts available for these patients results in a tremendous demand for alternative, supplemental circulatory support in the form of artificial heart pumps or ventricular assist devices (VADs). The development procedure for such a device requires careful consideration of biophysical factors, such as biocompatibility, haemolysis, thrombosis, implantability, physiologic control feasibility and pump performance. Conventional pump design equations based on Newton's law and computational fluid dynamics (CFD) are readily used for the initial design of VADs. In particular, CFD can be employed to predict the pressure-flow performance, hydraulic efficiencies, flow profile through the pump, stress levels and biophysical factors, such as possible blood cell damage. These computational flow simulations may involve comprehensive steady and transient flow analyses. The transient simulations involve time-varying boundary conditions and virtual modelling of the impeller rotation in the blood pumps. After prototype manufacture, laser flow measurements with sophisticated optics and mock circulatory flow loop testing assist with validation of pump design and identification of irregular flow patterns for optimization. Additionally, acute and chronic animal implants illustrate the blood pump's ability to support life physiologically. These extensive design techniques, coupled with fundamental principles of physics, ensure a reliable and effective VAD for thousands of heart failure patients each year.

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Section: Continuous Flow Vadsmentioning

confidence: 99%

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

Section: Physics Of Conventional Vad Designmentioning

confidence: 99%

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The medical physics of ventricular assist devices

et al. 2005

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“…Segundo Stepanoff (1957) o efeito imediato desse perfil de pressão faz com que a velocidade relativa da superfície de sucção seja maior que a velocidade relativa da superfície de pressão, como apresentado na Figura 2.2, onde a as siglas "SS" e "PS" significam superfície de sucção e superfície de pressão, respectivamente. A integração desse perfil de velocidades distorcido acarreta em uma altura de elevação menor do que se fosse considerado um perfil médio de velocidades.…”

Section: Distorção Do Perfil De Velocidades E Escoamento Secundáriounclassified

Modelo de deslizamento para escoamento gás/líquido em bomba centrífuga submersa operando com líquido de baixa viscosidade

Biazussi¹,

Bannwart²

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Este trabalho é a realização de um grande sonho pessoal. Uma conquista que somente foi possível porque recebi ajuda e apoio de muitas pessoas. Gostaria de agradecer a todos que direta ou indiretamente contribuíram e em particular: Ao Prof. Dr. Antonio Carlos Banwart pela oportunidade de ingressar no doutorado, orientação, conhecimentos compartilhados, confiança e principalmente pela amizade.Ao Dr. Valdir Estevam pelo apoio, ideias durante a realização do trabalho, bem como sugestões e correções do trabalho final.Aos professores da banca examinadora, Prof.

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Study on Radial Load in a Centrifugal Pump with Slope Volute Using CFD

Zhang

Min

Gao

et al. 2012

AMM

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Unsteady flow field in a centrifugal pump causes significant radial load on the impeller leading to the vibration in consequence. In order to reduce radial load, a special slope volute was proposed. The full 3D-URANS equations were solved for several flow rates between 60%~150% of rated conditions. The magnitude of average radial load was estimated by empirical formula. It was found that the numerical results agree with the results obtaining from empirical formula quite well. When adopting slope volute, the radial load on the impeller is much smaller compared with conventional spiral volute. So it is convinced that the radial load can be reduced significantly when using slope volute.

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Cone Flow and Axial Flow Pumps

Cited by 5 publications

References 0 publications

The medical physics of ventricular assist devices

The medical physics of ventricular assist devices

Modelo de deslizamento para escoamento gás/líquido em bomba centrífuga submersa operando com líquido de baixa viscosidade

Study on Radial Load in a Centrifugal Pump with Slope Volute Using CFD

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