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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41391

Title: A Comparison Study of Cavitating Flow in a Ventricular Assist Device Using Laminar and Turbulent Model
Authors: Chengkuo Huang;Jiahn-Horng Chen
Contributors: 國立臺灣海洋大學:系統工程暨造船學系
Keywords: Cavitation;Ventricular Assist Device;Valve;Turbulent Flow;Laminar Flow
Date: 2013-07
Issue Date: 2017-02-15T02:53:16Z
Abstract: Abstract:The two-dimensional cavitating flow phenomena due to the valve closure in a ventricular assist device were computationally studied. This is a simplification of three-dimensional viscous effects in a ventricular valve. Both laminar flow and turbulent flow were computed and compared with each other. For computations, a dynamic mesh strategy to cope with the movement of the valve was developed. The simulation of cavitation was conducted with a model which took considerations of the first-order effect of the formation and transport of vapor bubbles, the turbulent fluctuations of pressure and velocity, and the magnitude of non-condensable gases. The turbulent flow was computed by using thek-wmodel. The results show that the local turbulence is one of the vital effects on the development of the cavitating flow. The maximum velocity at the moments of valve closure was significantly reduced in the turbulent flow modeling. Turbulence also reduces the jet intensity at the valve closure and, hence, the cavitating region on the valve. Furthermore, the results show that the turbulent flow model has a better capability for prediction of cavitation duration.
Relation: 1(2)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41391
Appears in Collections:[系統工程暨造船學系] 期刊論文

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