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Titolo:
The flow patterns within the impeller passages of a centrifugal blood pumpmodel
Autore:
Yu, SCM; Ng, BTH; Chan, WK; Chua, LP;
Indirizzi:
Nanyang Technol Univ, Sch Mech & Prod Engn, Thermal & Fluids Engn Div, Singapore 639798, Singapore Nanyang Technol Univ Singapore Singapore 639798 gapore 639798, Singapore
Titolo Testata:
MEDICAL ENGINEERING & PHYSICS
fascicolo: 6, volume: 22, anno: 2000,
pagine: 381 - 393
SICI:
1350-4533(200007)22:6<381:TFPWTI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
VENTRICULAR ASSIST DEVICE; CARDIOGENIC-SHOCK; NONPULSATILE; PULSATILE; DESIGN; IMPROVEMENT; SUPPORT; HEART;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Yu, SCM Nanyang Technol Univ, Sch Mech & Prod Engn, Thermal & Fluids Engn Div, Singapore 639798, Singapore Nanyang Technol Univ Singapore Singapore639798 39798, Singapore
Citazione:
S.C.M. Yu et al., "The flow patterns within the impeller passages of a centrifugal blood pumpmodel", MED ENG PHY, 22(6), 2000, pp. 381-393

Abstract

The effects of impeller geometry on the performance of a centrifugal bloodpump model [the MSCBP design of Akamatsu and Tsukiya (The Seventh Asian Congress of Fluid Mechanics (1997), 7-10) at a 1:1 scale] have been investigated both experimentally and computationally. Four impeller designs were tested for pump hydraulic performance at the operating point (i.e. 2000 rpm), using blood analog as the working fluid. Each impeller has seven blades with different configurations including the radial straight blade and backwardswept blade designs. The results show that both designs can achieve a stable head of about 100 mm Hg at the operating point. Subsequent investigations involved the visualization of the relative flow field within the impellerpassages via the image de-rotation system coupled with a 2.5 W argon ion laser. Flow structures in all sectors of each impeller were examined and discussed. To further quantify the possible effects of blade geometry to thrombus formation and hemolysis, computational fluid dynamics (CFD) was used tosimulate a simplified two-dimensional blade-to-blade flow analysis so as to estimate the shear stress levels. The results indicate that the stress levels found within the blade passages are generally below the threshold level of 150 N/m(2) for extensive erythrocyte damage to occur. There are some localized regions near the leading edge of the blades where the stress levels are 60% above the threshold level. However, given such a short residence time for the fluid particles to go through these high shear stress regions,their effects appear to be insignificant. (C) 2000 IPEM. Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 07:33:58