國家衛生研究院 NHRI:Item 3990099045/1476
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    題名: Digital particle image velocimetry investigation of the pulsating flow around a simplified 2-D model of a bileaflet heart valve
    作者: Zhao, JB;Shi, YB;Yeo, TJH;Hwang, NHC
    貢獻者: Division of Medical Engineering Research
    摘要: Background and aim of study: Strong interactions are believed to exist between the pulsating valvular flow and the valve leaflet motions. Hinge position, indicated by d/W (d = distance between the two axes of the hinge pivots; W = width of the testing section in the middle plane), plays a critical role in MHV performance. An optimized hinge position for a bileaflet heart valve can be identified as a design criterion for better valve performance. Methods: A two-dimensional (2-D) digital particle image velocimetry (DPIV) system was used to map the transient flow field of a simplified 2-D model of a bileaflet heart valve with a hydraulic diameter enlarged three-fold under pressure waveforms which was expanded based on Womersley number and Euler number considerations. Six different hinge positions were investigated. Results: At extreme hinge positions (d/W <0.2 or d/W >0.3), large-scale and long-duration stagnation of flow was found in the central orifice, and instability and highly disturbed flow was noted in plots of velocity vectors. Conclusion: The transient flow pattern in the vicinity of the valve was greatly affected by the hinge position of moving leaflets. An optimum d/W in the range 0.2-0.3 yielded good velocity field and opening and closing behaviors.
    關鍵詞: Cardiac & Cardiovascular Systems
    日期: 2001-03
    關聯: Journal of Heart Valve Disease. 2001 Mar;10(2):239-253.
    Link to: http://www.ncbi.nlm.nih.gov/sites/entrez?myncbishare=nhrilib&Db=pubmed&Cmd=DetailsSearch&Term=11297212
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000170228300017
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0035086821
    顯示於類別:[黃煥常(2000-2008)] 會議論文/會議摘要

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