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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Boundary layer considerations in a multi-layer model for LDL accumulation.

Marcello Iasiello1, Kambiz Vafai2, Assunta Andreozzi1

  • 1a Dipartimento di Ingegneria Industriale , Università degli Studi di Napoli Federico II , Napoli , Italy.

Computer Methods in Biomechanics and Biomedical Engineering
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Boundary layer effects on Low-Density Lipoprotein (LDL) concentration in arteries are analyzed. Arterial wall properties significantly impact LDL concentration, clarifying polarization effects.

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Computational Biology

Background:

  • Low-Density Lipoprotein (LDL) accumulation in arteries is a key factor in atherosclerosis.
  • Understanding concentration polarization at the lumen-endothelium interface is crucial for predicting arterial disease progression.

Purpose of the Study:

  • To analyze boundary layer effects on LDL concentration in a multi-layer artery model.
  • To investigate how arterial geometry and physiological parameters influence LDL transport.

Main Methods:

  • Governing equations for mass, momentum, and species transport were formulated using porous media theory.
  • A multi-layer artery model, including a straight artery and an aorta-iliac bifurcation, was simulated.
  • The finite-element method, implemented in COMSOL Multiphysics, was used for numerical solutions.

Main Results:

  • Boundary layer thickness and LDL concentration profiles near the endothelium were quantified.
  • Inlet velocity, arterial size, and intramural pressure were shown to significantly affect the boundary layer.
  • The study identified key parameters influencing concentration polarization within the arterial system.

Conclusions:

  • Arterial wall properties and flow dynamics play a critical role in modulating LDL concentration gradients.
  • The findings enhance the understanding of concentration polarization mechanisms in arterial transport.
  • This research provides insights into the factors contributing to atherogenesis at the cellular level.