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- W4313305534 abstract "We perform direct numerical simulation (DNS) to study the clustering of small, heavy, monodisperse particles subject to collision-coagulation in turbulent flow (i.e., colliding particles always coagulate (coalesce) into large ones). We find that collision-coagulation causes the radial distribution function (RDF) of the particles to decrease strongly at particle separation distances $r$ close to the particle diameter $d$. However, the RDF do not decrease indefinitely but approach a finite value in the limit of $rto d$. We study how the characteristics of this depletion zone relate to the particle Stokes number (St), particle diameter, and the Reynolds number of the turbulent flow. A collision-induced modulation factor $gamma_{c}$ is defined to represent the degree of RDF depletion due to collisions-coagulation. In the region where $gamma_c(r)$ is a quasi-power-law, the corresponding power-law exponent $tilde{c}_1$ only depends weakly on $St$. The overall trend of $tilde{c}_1$ with respect to $St$ is similar to that of the classical power-law exponent $c_{1}$ appearing in the RDF of non-colliding particles, i.e., the exponent increase at small $St$, peak around $St approx 0.7$, and decrease thereafter. The same qualitative trend is also observed for the limiting values of $gamma_c$ at $rto d$. A complementary investigation on the Stokes number trend of the full RDF in the depletion zone is conducted. The slope of RDF appears constant for $Stll1$ but is changing when $St$ is getting large. The position where the RDF starts to decrease is found to be $St$-dependent. The depletion zone is insensitive to the flow Reynolds number and $gamma_c$ of different $Re_{lambda}$ overlap. With changing particle diameter $d$, the reduction of RDF occurs at scales that shift accordingly and always starts at around $2.4d-3d$. The shape of $gamma_c(r)$ is independent of changes in $d$." @default.
- W4313305534 created "2023-01-06" @default.
- W4313305534 creator A5045655629 @default.
- W4313305534 creator A5075121031 @default.
- W4313305534 date "2022-12-27" @default.
- W4313305534 modified "2023-09-23" @default.
- W4313305534 title "Sharp depletion of radial distribution function of particles due to collision and coagulation inside turbulent flow" @default.
- W4313305534 doi "https://doi.org/10.48550/arxiv.2212.13665" @default.
- W4313305534 hasPublicationYear "2022" @default.
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