title: Spatial variations in shear stress in a 3-D bifurcation model at low Reynolds numbers.
abstract: Real-time wall shear stress is difficult to monitor precisely because it varies in space and time. Microelectromechanical systems sensor provides high spatial resolution to resolve variations in shear stress in a 3-D bifurcation model for small-scaled hemodynamics. At low Reynolds numbers from 1.34 to 6.7 skin friction coefficients (C(f)) varied circumferentially by a factor of two or more within the bifurcation. At a Reynolds number of 6.7, the C(f) value at the lateral wall of the bifurcation along the 270 degree plane was 7.1, corresponding to a shear stress value of 0.0061 dyn/cm(2). Along the 180 degree plane, C(f) was 13 or 0.0079 dyn/cm(2), and at the medial wall along the 90 degree plane, C(f) was 10.3 or 0.0091 dyn/cm(2). The experimental skin friction coefficients correlated with values derived from the Navier-Stokes solutions.
authors.affiliation: Department of Biomedical Engineering and Division of Cardiovascular Medicine, Viterbi School of Engineering and Keck School of Medicine, University of Southern California, Los Angeles, CA 90081, USA.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Rouhanizadeh
authors.forename: Tiantian C
authors.initials: TC
authors.lastname: Lin
authors.forename: Diego
authors.initials: D
authors.lastname: Arcas
authors.forename: Juliana
authors.initials: J
authors.lastname: Hwang
authors.forename: Tzung K
authors.initials: TK
authors.lastname: Hsiai
mesh_terms: D000818:Animals; D001158:Arteries / Q000502:physiology*; D001783:Blood Flow Velocity / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D003198:Computer Simulation; D004548:Elasticity; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008955:Models, Cardiovascular; D033081:Shear Strength; D013314:Stress, Mechanical