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HYDRODYNAMICALLY UNSTABLE TURNING FLOW IN THE END-SPACE OF A MAGNETICALLY GUIDED CNS CATHETER

Joseph A. C. Humphrey
Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville, VA 22904, USA

Elisa Ferrante
Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville, VA 22904, USA

George T. Gillies
Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville, VA 22904, USA

Jorge L. Rosales
Phoenix Analysis and Design Technologies ASU Research Park 7755 S. Research Dr., Suite 110 Tempe, AZ 85284

Resumo

A study has been performed for the flow and heat transfer in the space between a pair of concentric tubes around the location where the fluid emerging from the inner tube tums 180° along the flat sealed end of the outer tube to proceed axially along the annular space between the tubes. Three Reynolds numbers and two end-flow spacings are investigated for the case with a solid ring externally mounted on the end of the inner tube. In the calculations the ring experiences uniform energy generation to simulate ohmic heating and its temperature field is a function of the flow-thermal field coupling. The results reveal a flow field that is 2D and steady at low Reynolds but which quickly becomes 3D and unsteadychaotic at higher Reynolds. The findings are important for the development of fluid-cooled magnetically-guided catheters used for drug delivery as well as interventional procedures within the endovasculature and the neurovasculature. Because of page limitations, this paper focuses on the fluid mechanics results for an isothermal flow and a single end-flow spacing.