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標題:Estimation of Viscous Dissipative Stresses Induced by a Mechanical Heart Valve Using PIV Data
學年97
學期2
發表日期2009/05/28
作品名稱Estimation of Viscous Dissipative Stresses Induced by a Mechanical Heart Valve Using PIV Data
作品名稱(其他語言)
著者Li, C. P.; Lo, C. W.; Lu, P. C.
作品所屬單位淡江大學水資源及環境工程學系
出版者Lippincott Williams & Wilkins
會議名稱ASAIO 55rd Anniversary Conference
會議地點Dallas, USA
摘要Among the clinical complications of mechanical heart valves (MHVs), hemolysis was previously thought to result from Reynolds stresses in turbulent flows. A more recent hypothesis suggests viscous dissipative stresses at spatial scales similar in size to red blood cells may be related to hemolysis in MHVs, but the resolution of current instrumentation is insufficient to measure the smallest eddy sizes. We studied the St. Jude Medical (SJM) 27 mm valve in the aortic position of a pulsatile circulatory mock loop under physiologic conditions with particle image velocimetry (PIV). Assuming a dynamic equilibrium assumption between the resolved and sub-grid-scale (SGS) energy flux, the SGS energy flux was calculated from the strain rate tensor computed from the resolved velocity fields and the SGS stress was determined by the Smagorinsky model, from which the turbulence dissipation rate and then the viscous dissipative stresses were estimated. Our results showed Reynolds stresses up to 80 N/m2 throughout the cardiac cycle, and viscous dissipative stresses below 12 N/m2. The viscous dissipative stresses remain far below the threshold of red blood cell hemolysis, but could potentially damage platelets, implying the need for further study in the phenomenon of MHV hemolytic complications.
關鍵字
語言英文
收錄於
會議性質
校內研討會地點
研討會時間20090528~20090530
通訊作者
國別美國
公開徵稿Y
出版型式紙本
出處ASAIO 55rd Anniversary Conference,
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