Extracapillary flow type oxygenators have a structure in which blood can flow free in the space outside of hollow fibers.Therefore, the blood stream shows a complex flow pattern .Thus, the gas transfer performance is influenced by the behavior of the blood flow pattern.A slight alterations of the shape of the oxygenator may change the blood flow.Up to the present, these desinging problems have been improved by trial and error method.We have been investigating the adaptability of the Computational Fluid Dynamics(CFD)for analysis of the flow patterns in artificial organs and the desinging of inproved membrane oxygenators.In this study, we simulated the flow-speed and the blood pressure in the oxygenator using how regard hollow fibers as porous materials.The results showed the visualization of the flow pattern in the oxygenator.The pressure drop and the flow pattern obtained by simulation was almost the same as in-vitro experimental results.Thus, fluid analysis using CFD helps the understanding of the flow pattern in the oxygenator and has high feasibility in producing the artificial organs.

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