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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/97949

    Title: The effect of turbulent viscous shear stress on red blood cell hemolysis
    Authors: Yen, Jen-Hong;Chen, Sheng-Fu;Chern, Ming-Kai;Lu, Po-Chien
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Hemolysis;Sub-grid scale;Turbulent dissipation rate;Viscous dissipative stresses;Particle image velocimetry
    Date: 2014-03
    Issue Date: 2014-05-13 10:56:45 (UTC+8)
    Publisher: Tokyo: Springer Japan KK
    Abstract: Non-physiologic turbulent flow occurs in medical cardiovascular devices resulting in hemodynamic stresses that may damage red blood cells (RBC) and cause hemolysis. Hemolysis was previously thought to result from Reynolds shear stress (RSS) in turbulent flows. A more recent hypothesis suggests that turbulent viscous shear stresses (TVSS) at spatial scales similar in size to RBCs are related to their damage. We applied two-dimensional digital particle image velocimetry to measure the flow field of a free-submerged axisymmetric jet that was utilized to hemolyze porcine RBCs in selected locations. Assuming a dynamic equilibrium for the sub-grid scale (SGS) energy flux between the resolved and the sub-grid scales, the SGS energy flux was calculated from the strain rate tensor computed from the resolved velocity fields. The SGS stress was determined by the Smagorinsky model, from which the turbulence dissipation rate and then TVSS were estimated. Our results showed the hemolytic threshold of the Reynolds stresses was up to 517 Pa, and the TVSSs were at least an order of magnitude less than the RSS. The results provide further insight into the relationship between turbulence and RBC damage.
    Relation: Journal of Artificial Organs 17(2), pp.178-185
    DOI: 10.1007/s10047-014-0755-3
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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