Increasing fluid micropolarity in a 3D human carotid model affected blood velocity by 4% and decreased wall shear stress compared to a Newtonian fluid model.
Does a micropolar fluid model compared to a Newtonian fluid model affect simulated blood flow characteristics in a human carotid model?
Computational modeling shows that incorporating blood's micropolar properties results in decreased wall shear stress in the carotid artery, which may be relevant for understanding atherosclerosis development.
Blood is a non-homogeneous fluid that flows inside the human artery system and provides the cells with nutrients. In this study the auto rotation effect of blood’s microstructure on its flow inside a human carotid model is studied by using a micropolar fluid model. The study aims to investigate the flow differences that occur due to its microstructure as compared to a Newtonian fluid. We focus on the vortex viscosity effect, i.e., the ratio of microrotation viscosity to the total one, because this is the only parameter that affects directly the fluid flow. Simulations in a range of vortex viscosities, are carried out in a 3D human carotid model that is computationally reconstructed. All of the simulations are conducted at the diastolic Reynolds number that occurs in the human carotid. Results indicate that micropolarity affects blood velocity in the range of parameters studied by 4%. As micropolarity is increased, higher velocities in the center of vessels and lower near the boundaries are found as compared to a Newtonian fluid consideration. This is an indication that the increase of the fluid’s micropolarity leads to an increase of the boundary layer thickness. More importantly, an increase in vortex viscosity and the resulting increase in microrotation result in decreased shear stress in the carotid’s walls; this finding can be significant in regards to the onset and the development of atherosclerosis. Finally, the flow distribution at the carotid seems to heavily be affected by the geometry and the micropolarity of the fluid.
Karvelas et al. (Wed,) conducted a other in Blood flow / Atherosclerosis. Micropolar fluid model vs. Newtonian fluid model was evaluated on Blood velocity, shear stress, and flow distribution. Increasing fluid micropolarity in a 3D human carotid model affected blood velocity by 4% and decreased wall shear stress compared to a Newtonian fluid model.
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