esmaily_etal_2020
Summary
A benchmark for particle-laden turbulent duct flow: A joint computational and experimental study. M. Esmaily, L. Villafane, A.J. Banko, G. Iaccarino, J.K. Eaton and A. Mani. International Journal of Multiphase Flow, 132:103410, 2020. (URL)
Abstract
A turbulent duct flow laden with small heavy inertial particles ($Re_\tau \approx 570$, $d_p^+ \approx 0.3$, $\textrm{St} \approx 12$, and $d_p/\eta \approx 0.17$) is studied computationally and experimentally. We examine whether a long development section can be modeled using a short periodic domain. This simplification is not valid if the development section is too short (less than 25 to 50 duct-height in our case), the periodic simulation is not integrated long enough (less than O(1000) large-eddy turnover time in our case), or the effective mass loading ratio is not adjusted correctly (increased by a factor of 1.5 in our case). Additionally, we show that ignoring particle-particle collisions, even when the volume fraction is as low as $3.9 \times 10^{-6}$ produces a large over-estimation of near-wall particle concentration (turbophoresis). The necessity of tailored post-processing of simulations for a one-to-one comparison against experiments is demonstrated. Namely, the finite thickness of the laser sheet and the optically-sampled volume size should be considered when post-processing simulations to reproduce the experimental measurement of clustering statistics. Experimentally and computationally, we show that an increase in the mass-loading ratio from 2.4\% to 12\% has a minimal effect on clustering, slightly lowers velocity fluctuations, and diminishes turbophoresis.
Bibtex entry
@ARTICLE { esmaily_etal_2020,
TITLE = { A benchmark for particle-laden turbulent duct flow: A joint computational and experimental study },
AUTHOR = { M. Esmaily and L. Villafane and A.J. Banko and G. Iaccarino and J.K. Eaton and A. Mani },
JOURNAL = { International Journal of Multiphase Flow },
ABSTRACT = { A turbulent duct flow laden with small heavy inertial particles ($Re_\tau \approx 570$, $d_p^+ \approx 0.3$, $\textrm{St} \approx 12$, and $d_p/\eta \approx 0.17$) is studied computationally and experimentally. We examine whether a long development section can be modeled using a short periodic domain. This simplification is not valid if the development section is too short (less than 25 to 50 duct-height in our case), the periodic simulation is not integrated long enough (less than O(1000) large-eddy turnover time in our case), or the effective mass loading ratio is not adjusted correctly (increased by a factor of 1.5 in our case). Additionally, we show that ignoring particle-particle collisions, even when the volume fraction is as low as $3.9 \times 10^{-6}$ produces a large over-estimation of near-wall particle concentration (turbophoresis). The necessity of tailored post-processing of simulations for a one-to-one comparison against experiments is demonstrated. Namely, the finite thickness of the laser sheet and the optically-sampled volume size should be considered when post-processing simulations to reproduce the experimental measurement of clustering statistics. Experimentally and computationally, we show that an increase in the mass-loading ratio from 2.4\% to 12\% has a minimal effect on clustering, slightly lowers velocity fluctuations, and diminishes turbophoresis. },
VOLUME = { 132 },
PAGES = { 103410 },
YEAR = { 2020 },
URL = { https://doi.org/10.1016/j.ijmultiphaseflow.2020.103410 },
}