Experiments on flow inside enlarged models of bileaflet artificial heart valves
學年 87
學期 1
出版(發表)日期 1999-01-01
作品名稱 Experiments on flow inside enlarged models of bileaflet artificial heart valves
著者 Lu, Po-chien; Weng, Jia-hurng; Chu, Shu-hsun
單位 淡江大學水資源及環境工程學系
出版者 Singapore: World Scientific Publishing Co. Pte. Ltd.
著錄名稱、卷期、頁數 Biomedical engineering: applications basis communications 11(3), pp.139-147
摘要 The main purpose of this study was to carry out a detailed study of the flow fields between the leaflets of widely used bileaflet heart valves. In conventional research, the sewing ring of the valve acts as an obstacle for measurement. In addition, the small space in bentween the leaflets limits the amount of detailed measurement that can be done. Therefore, in this study two enlarged semicircular plates were used to mimic the actual fully-opened leaflets during peak systole and the flow field was measured according to dynamic similarity. Flow visualization technique and a laser Doppler anemometer (LDA) were used to obtain qualitative and quantitative data, respectively, of the various turbulence characteristics of the flow between the plates and downstream near field. The spacings and angles of the plates were changed to study the effects that their interactions had on the flow field. According to the experimental results of the visualized flow fields, the deflection of the central flow field is more obvious as the angle of bileaflets becomes larger, mainly due to the Coanda effect. However, the direction of deflection is not specific but is especially obvious when the opening angle is 12 °. As the interval increases, the Coanda effect tends to decrease. The LDA measurements show that the maximum shear stress is small when the leaflets are fully open and the opening angle is 0°∼ 6 °, thus lowering the possibility of thrombosis.
語言 en
ISSN 1016-2372 1793-7132
期刊性質 國外
收錄於 EI
出版型式 紙本

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44602 )