Technical Briefs

Combination of CFD and DOE to Analyze and Improve the Mass Flow Rate in Urinary Catheters

[+] Author and Article Information
Patrick Frawley, Marco Geron

Department of Mechanical and Aeronautical Engineering, University of Limerick, Casteltroy, Limerick, Ireland

J Biomech Eng 131(8), 084501 (Jun 19, 2009) (5 pages) doi:10.1115/1.3128692 History: Received November 25, 2008; Revised March 11, 2009; Published June 19, 2009

The urinary catheter is a thin plastic tube that has been designed to empty the bladder artificially, effortlessly, and with minimum discomfort. The current CH14 male catheter design was examined with a view to optimizing the mass flow rate. The literature imposed constraints to the analysis of the urinary catheter to ensure that a compromise between optimal flow, patient comfort, and everyday practicality from manufacture to use was achieved in the new design. As a result a total of six design characteristics were examined. The input variables in question were the length and width of eyelets 1 and 2 (four variables), the distance between the eyelets, and the angle of rotation between the eyelets. Due to the high number of possible input combinations a structured approach to the analysis of data was necessary. A combination of computational fluid dynamics (CFD) and design of experiments (DOE) has been used to evaluate the “optimal configuration.” The use of CFD couple with DOE is a novel concept, which harnesses the computational power of CFD in the most efficient manner for prediction of the mass flow rate in the catheter.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

BS directive for evaluating mass flow rate through a catheter

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Figure 2

Geometrical details of CH-14 catheter (all measures are in millimeters)

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Figure 3

Mesh generated for the CH-14 catheter

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Figure 4

Vector plot in a streamwise section of the catheter

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Figure 5

Vector plot in the top part of the catheter-dead fluid zone at the tip

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Figure 6

Main plot effect for mass flow rate output

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Figure 7

Interaction plot for mass flow rate




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