Neutrally Buoyant Particle Migration in Poiseuille Flow Driven by Pulsatile Velocity

Abstract

A neutrally buoyant circular particle migration in two-dimensional (2D) Poiseuille channel flow driven by pulsatile velocity is numerical studied by using immersed boundary-lattice Boltzmann method (IB-LBM). The effects of Reynolds number (25≤Re≤200) and blockage ratio (0.15≤k≤0.40) on particle migration driven by pulsatile and non-pulsatile velocity are all numerically investigated for comparison. The results show that, different from non-pulsatile cases, the particle will migrate back to channel centerline with underdamped oscillation during the time period with zero-velocity in pulsatile cases. The maximum lateral travel distance of the particle in one cycle of periodic motion will increase with increasing Re, while k has little impact. The quasi frequency of such oscillation has almost no business with Re and k. Moreover, Re plays an essential role in the damping ratio. Pulsatile flow field is ubiquitous in aorta and other arteries. This article is conducive to understanding nanoparticle migration in those arteries.

Lateral Migration of Variously Shaped Particles: A Computational Study

“…The obtained equilibrium positions (Y eq ) are tabulated in Tab. 1 and are in good agreement with the results of Huang et al [24].…”

“…The equilibrium positions are shifted downwards and the migration times are reduced considerably when the particles Table 1. Comparison of the equilibrium positions Y eq of particles in Poiseuille flow for two diameters observed in the present work with those found in [24] (Re = 50.0).…”

“…Y eq [24] Y eq (present study) have a mass. The buoyancy force acts against the wall-induced lift in the direction of the lower wall.…”

Sedimentation of particles with various shapes and orientations in a closed channel using smoothed particle hydrodynamics

“…The validity of the SPH method is demonstrated by simulating the sedimentation of a circle based on the open-source library SPHinXsys (Zhang et al 2021b), using the same setup as Hashemi et al (2012) as shown in figure 1. To compare the results, the LBM is also utilized, which has been previously validated in our work (Huang et al 2021). Figure 2 shows that the vertical position Y p and settling velocity V y of the circle over time match well with both the results of LBM and those reported by Hashemi et al (2012) and (Glowinski et al 2001).…”

Editorial for the Special Issue on Heat and Mass Transfer in Micro/Nanosystems

“…For an efficient evaluation of the flow and pressure distributions in a microchannel network, Zhao et al [ 7 ] introduced an electric circuit analogy and applied it to study the effect of microchannel length on the flow behaviors. Another interesting study is presented by Huang et al [ 8 ], where the immersed boundary method has been combined with the lattice Boltzmann method to study the trajectory of a neutrally buoyant circular particle in the pulsatile channel flow. The particle exhibits rich dynamic behaviors which have not been observed in non-pulsatile situations, and the results could be useful for nanoparticle transport in drug delivery applications.…”