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Analysis of Transitional and Turbulent Flow Through the FDA Benchmark Nozzle Model Using Laser Doppler Velocimetry

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Abstract

Transitional and turbulent flow through a simplified medical device model is analyzed as part of the FDA’s Critical Path Initiative, designed to improve the process of bringing medical products to market. Computational predictions are often used in the development of devices and reliable in vitro data is needed to validate computational results, particularly estimations of the Reynolds stresses that could play a role in damaging blood elements. The high spatial resolution of laser Doppler velocimetry (LDV) is used to collect two component velocity data within the FDA benchmark nozzle model. Two flow conditions are used to produce flow encompassing laminar, transitional, and turbulent regimes, and viscous stresses, principal Reynolds stresses, and turbulence intensities are calculated from the measured LDV velocities. Axial velocities and viscous stresses are compared to data from a prior inter-laboratory study conducted with particle image velocimetry. Large velocity gradients are observed near the wall in the nozzle throat and in the jet shear layer located in the expansion downstream of the throat, with axial velocity changing as much as 4.5 m/s over 200 μm. Additionally, maximum Reynolds shear stresses of 1000–2000 Pa are calculated in the high shear regions, which are an order of magnitude higher than the peak viscous shear stresses (<100 Pa). It is important to consider the effects of both viscous and turbulent stresses when simulating flow through medical devices. Reynolds stresses above commonly accepted hemolysis thresholds are measured in the nozzle model, indicating that hemolysis may occur under certain flow conditions. As such, the presented turbulence quantities from LDV, which are also available for download at https://fdacfd.nci.nih.gov/, provide an ideal validation test for computational simulations that seek to characterize the flow field and to predict hemolysis within the FDA nozzle geometry.

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Acknowledgments

This study was supported by the US Food and Drug Administration’s Critical Path Initiative. We would like to thank Dr. Luke Herbertson for reviewing the manuscript and providing valuable comments.

Disclaimer

Any mention of commercial products and/or manufactures does not imply endorsement by the US Department of Health and Human Services.

Disclosures

The authors have no conflicts or disclosures. No human or animal studies were performed as part of this study.

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Authors and Affiliations

  1. Department of Biomedical Engineering, The Pennsylvania State University, 205 Hallowell Building, University Park, PA, 16802, USA

    Joshua O. Taylor, Bryan C. Good, Anthony V. Paterno, Steven Deutsch & Keefe B. Manning

  2. Applied Research Laboratory, The Pennsylvania State University, State College, PA, USA

    Joshua O. Taylor & Steven Deutsch

  3. Office of Science and Engineering Laboratories, Food and Drug Administration, Silver Spring, MD, USA

    Prasanna Hariharan & Richard A. Malinauskas

  4. Department of Surgery, The Penn State College of Medicine, Hershey, PA, USA

    Keefe B. Manning

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  1. Joshua O. Taylor
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Correspondence to Keefe B. Manning.

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Associate Editor Ajit P. Yoganathan oversaw the review of this article.

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Taylor, J.O., Good, B.C., Paterno, A.V. et al. Analysis of Transitional and Turbulent Flow Through the FDA Benchmark Nozzle Model Using Laser Doppler Velocimetry. Cardiovasc Eng Tech 7, 191–209 (2016). https://doi.org/10.1007/s13239-016-0270-1

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