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- W184640299 abstract "In this paper, a mathematical model is presented to determine the resistance characteristics of a self cleaning prosthetic heart valve. The total pressure drop across the valve can be calculated as a sum of the pressure drops due to the orifice and valve. The pressure drop through the orifice is calculated by considering it as an inlet of a tube and using the theory due to Schiller. The resistance of the valve itself is calculated by using the method due to Von Karman. Is is considered that the hydrodynamically shaped ball constitutes a discontinuity surface which can be replaced with a vortex sheet. The condition of stability of the vortex sheet is expressed in terms of a ratio h/ℓ where ℓ is the distance between consecutive vortices in the same row and h is the lateral spacing between the rows. Furthermore, the resistance expression for the valve can be found as a function of ua/Vo where ua is the vortex sheet velocity and Vo is the free stream velocity. Results showed that the total pressure drop is mainly due to the orifice. The pressure drop due to the valve represents approximately 13% of the total resistance. By using this method, various parameter of the self cleaning prosthetic valve can be determined such as flow characteristics namely velocity and pressure fields behind the ball and geometrical form of the valve. The theoretical results of the total pressure drop calculations are in good agreement with the experimental results obtained with a self cleaning valve." @default.
- W184640299 created "2016-06-24" @default.
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- W184640299 date "1978-01-01" @default.
- W184640299 modified "2023-09-25" @default.
- W184640299 title "AN ANALYTICAL STUDY OF THE SELF CLEANING HEART VALVE" @default.
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- W184640299 doi "https://doi.org/10.1016/b978-0-08-022678-1.50011-4" @default.
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