The pulsatile flow and gas transport of a Newtonian passive fluid across an array of cylindrical microfibers are numerically investigated. It is related to an implantable, artificial lung where the blood flow is driven by the right heart. The fibers are modeled as either squared or staggered arrays. The pulsatile flow inputs considered in this study are a steady flow with a sinusoidal perturbation and a cardiac flow. The aims of this study are twofold: identifying favorable array geometry/spacing and system conditions that enhance gas transport; and providing pressure drop data that indicate the degree of flow resistance or the demand on the right heart in driving the flow through the fiber bundle. The results show that pulsatile flow improves the gas transfer to the fluid compared to steady flow. The degree of enhancement is found to be significant when the oscillation frequency is large, when the void fraction of the fiber bundle is decreased, and when the Reynolds number is increased; the use of a cardiac flow input can also improve gas transfer. In terms of array geometry, the staggered array gives both a better gas transfer per fiber (for relatively large void fraction) and a smaller pressure drop (for all cases). For most cases shown, an increase in gas transfer is accompanied by a higher pressure drop required to power the flow through the device.
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February 2006
Technical Papers
Pulsatile Flow and Mass Transport Over an Array of Cylinders: Gas Transfer in a Cardiac-Driven Artificial Lung
Kit Yan Chan,
Kit Yan Chan
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109
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Hideki Fujioka,
Hideki Fujioka
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109
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Robert H. Bartlett,
Robert H. Bartlett
Department of Surgery,
The University of Michigan Medical School
, Ann Arbor, Michigan 48109
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Ronald B. Hirschl,
Ronald B. Hirschl
Department of Surgery,
The University of Michigan Medical School
, Ann Arbor, Michigan 48109
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James B. Grotberg
James B. Grotberg
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109
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Kit Yan Chan
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109
Hideki Fujioka
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109
Robert H. Bartlett
Department of Surgery,
The University of Michigan Medical School
, Ann Arbor, Michigan 48109
Ronald B. Hirschl
Department of Surgery,
The University of Michigan Medical School
, Ann Arbor, Michigan 48109
James B. Grotberg
Department of Biomedical Engineering,
The University of Michigan
, Ann Arbor, Michigan 48109J Biomech Eng. Feb 2006, 128(1): 85-96 (12 pages)
Published Online: September 14, 2005
Article history
Received:
May 4, 2005
Revised:
September 14, 2005
Citation
Chan, K. Y., Fujioka, H., Bartlett, R. H., Hirschl, R. B., and Grotberg, J. B. (September 14, 2005). "Pulsatile Flow and Mass Transport Over an Array of Cylinders: Gas Transfer in a Cardiac-Driven Artificial Lung." ASME. J Biomech Eng. February 2006; 128(1): 85–96. https://doi.org/10.1115/1.2133761
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