| Summary: | 碩士 === 國立臺灣大學 === 土木工程學系 === 85 === Implantation of total artificial heart (T.A.H.) into the human
bodyhas inspired courage in clinic, yet the strive to develop a
new-typeT.A.H. is still undergoing. The former Phoenix
pneumatic-type T.A.H.is often criticized for its low mobility
and high possibility ofinfection. The newly developed Phoenix
electro-hydraulic T.A.H. ismainly aimed at tackling these
shortcomings. The movement of bloodflow inside the artificial
heart is driven by a set of impellers inconjunction with DC
motors. Due to the limited physiological chestspace for
implanting the T.A.H., these driving devices are of verysmall
sized and little information is available for their performance.
The experiments conducted by the University of Utah did not
revealsatisfactory results, and a theoretical analysis was
inevitable.The present study utilizes the partial differential
equation( PDE )method to generate surface representation of
impellers. Other detailedstructures are designed with the
popular CAD packages, such as AutoCADand Matlab. Flow Analysis
around the impeller is performed by using thecommercial code,
CFX4, to solve the fully incompressible three-dimensionalNavier-
Stokes equations plus turbulence model with moving grids
Numericalresults show that secondary flows are observed in the
vicinity of blades.These secondary flows contribute to major
energy loss in the pumping device.One way to improve the
efficiency is through the optimization design todestroy these
flow structures of secondary eddies.
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