教師資料查詢 | 類別: 期刊論文 | 教師: 盧博堅 LU PO-CHIEN (瀏覽個人網頁)

標題:Cavitation Phenomena in Mechanical Heart Valves: Studied by Using a Physical Impinging Rod System
學年99
學期1
出版(發表)日期2010/10/01
作品名稱Cavitation Phenomena in Mechanical Heart Valves: Studied by Using a Physical Impinging Rod System
作品名稱(其他語言)
著者Lo, Chi-Wen; Chen, Sheng-Fu; Li, Chi-Pei; Lu, Po-Chien
單位淡江大學水資源及環境工程學系
出版者New York: Springer New York LLC
著錄名稱、卷期、頁數Annals of Biomedical Engineering 38(10), pp.3162-3172
摘要When studying mechanical heart valve cavitation, a physical model allows direct flow field and pressure measurements that are difficult to perform with actual valves, as well as separate testing of water hammer and squeeze flow effects. Movable rods of 5 and 10 mm diameter impinged same-sized stationary rods to simulate squeeze flow. A 24 mm piston within a tube simulated water hammer. Adding a 5 mm stationary rod within the tube generated both effects simultaneously. Charged-coupled device (CCD) laser displacement sensors, strobe lighting technique, laser Doppler velocimetry (LDV), particle image velocimetry (PIV) and high fidelity piezoelectric pressure transducers measured impact velocities, cavitation images, squeeze flow velocities, vortices, and pressure changes at impact, respectively. The movable rods created cavitation at critical impact velocities of 1.6 and 1.2 m/s; squeeze flow velocities were 2.8 and 4.64 m/s. The isolated water hammer created cavitation at 1.3 m/s piston speed. The combined piston and stationary rod created cavitation at an impact speed of 0.9 m/s and squeeze flow of 3.2 m/s. These results show squeeze flow alone caused cavitation, notably at lower impact velocity as contact area increased. Water hammer alone also caused cavitation with faster displacement. Both effects together were additive. The pressure change at the vortex center was only 150 mmHg, which cannot generate the magnitude of pressure drop required for cavitation bubble formation. Cavitation occurred at 3–5 m/s squeeze flow, significantly different from the 14 m/s derived by Bernoulli’s equation; the temporal acceleration of unsteady flow requires further study.
關鍵字Cavitation; Mechanical heart valve; Physical model; Squeeze flow; Water hammer; Vortex
語言英文
ISSN0090-6964; 1573-9686
期刊性質國外
收錄於SCI
產學合作
通訊作者Lu, Po-Chien
審稿制度
國別美國
公開徵稿
出版型式紙本
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