Med Biol Eng Comput - Measurements of steady flow through a bileaflet mechanical heart valve using stereoscopic PIV.

Tópicos

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Resumo

Computational modeling of bileaflet mechanical heart valve (BiMHV) flow requires experimentally validated datasets and improved knowledge of BiMHV fluid mechanics. In this study, flow was studied downstream of a model BiMHV in an axisymmetric aortic sinus using stereoscopic particle image velocimetry. The inlet flow was steady and the Reynolds number based on the aortic diameter was 7600. Results showed the out-of-plane velocity was of similar magnitude as the transverse velocity. Although additional studies are needed for confirmation, analysis of the out-of-plane velocity showed the possible presence of a four-cell streamwise vortex structure in the mean velocity field. Spatial data for all six Reynolds stress components were obtained. Reynolds normal stress profiles revealed similarities between the central jet and free jets. These findings are important to BiMHV flow modeling, though clinical relevance is limited due to the idealized conditions chosen. To this end, the dataset is publicly available for CFD validation purposes.

Resumo Limpo

comput model bileaflet mechan heart valv bimhv flow requir experiment valid dataset improv knowledg bimhv fluid mechan studi flow studi downstream model bimhv axisymmetr aortic sinus use stereoscop particl imag velocimetri inlet flow steadi reynold number base aortic diamet result show outofplan veloc similar magnitud transvers veloc although addit studi need confirm analysi outofplan veloc show possibl presenc fourcel streamwis vortex structur mean veloc field spatial data six reynold stress compon obtain reynold normal stress profil reveal similar central jet free jet find import bimhv flow model though clinic relev limit due ideal condit chosen end dataset public avail cfd valid purpos

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