A continuum-based multiphase DNS method for studying the Brownian dynamics of soot particles in a rarefied gas

Kannan, Ananda Subramani; Naserentin, Vasilis; Mark, Andreas; Maggiolo, Dario; Sardina, Gaetano; Sasic, Srdjan; Ström, Henrik

doi:10.1016/j.ces.2019.115229

Cited by 6 publications

(2 citation statements)

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“…It is then of great interest to understand the differences in flow and transport characteristics of artificially designed systems to their intended natural counterparts. Such studies are particularly relevant for understanding pressure-driven transport of nanoparticles through micro-channels as encountered during reactive particulate matter flows in catalytic automobile exhaust after-treatment devices [27]. The physical scales studied here are also relevant for nanoparticle and dust transport in ambient to low-pressure environments inside natural porous media (such as ceramic substrates) or man-made electronics (such as printed circuit boards) [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…However, related work on their multiphase counterparts (where a solid particle and a rarefied gas co-exist in the micro-channel) are relatively scarce. Currently, these reported multiphase studies are mostly limited to assessing stationary flow past a particle (e.g., [24][25][26][27]), indicative of a knowledge gap. In fact, investigations on the effect of an additional particulate phase on the Knudsen paradox noted in micro-channel Poiseuille flows (in the transition regime) have not been previously reported.…”

Section: Introductionmentioning

confidence: 99%

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The Knudsen Paradox in Micro-Channel Poiseuille Flows with a Symmetric Particle

et al. 2020

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The Knudsen paradox—the non-monotonous variation of mass-flow rate with the Knudsen number—is a unique and well-established signature of micro-channel rarefied flows. A particle which is not of insignificant size in relation to the duct geometry can significantly alter the flow behavior when introduced in such a system. In this work, we investigate the effects of a stationary particle on a micro-channel Poiseuille flow, from continuum to free-molecular conditions, using the direct simulation Monte-Carlo (DSMC) method. We establish a hydrodynamic basis for such an investigation by evaluating the flow around the particle and study the blockage effect on the Knudsen paradox. Our results show that with the presence of a particle this paradoxical behavior is altered. The effect is more significant as the particle becomes large and results from a shift towards relatively more ballistic molecular motion at shorter geometrical distances. The need to account for combinations of local and non-local transport effects in modeling reactive gas–solid flows in confined geometries at the nano-scale and in nanofabrication of model pore systems is discussed in relation to these results.

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