Numerical investigation of spatially nonhomogeneous acoustic agglomeration using sectional algorithm
In the simulation of acoustic agglomeration, the conventional temporal model assumes spatial homogeneity in aerosol properties and sound field, which is often not the case in real applications. In this article, we investigated the effects of spatial nonhomogeneity of sound field on the acoustic a...
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Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
2019
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Subjects: | |
Online Access: | https://hdl.handle.net/10356/83243 http://hdl.handle.net/10220/50134 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | In the simulation of acoustic agglomeration, the conventional temporal model assumes spatial
homogeneity in aerosol properties and sound field, which is often not the case in real applications.
In this article, we investigated the effects of spatial nonhomogeneity of sound field on the acoustic
agglomeration process through a one-dimensional spatial sectional model. The spatial sectional
model is validated against existing experimental data and results indicate lower requirements on
the number of sections and better accuracy. Two typical cases of spatial nonhomogeneous acoustic
agglomeration are studied by the established model. The first case involves acoustic agglomeration
in a standing wave field with spatial alternation of acoustic kernels from nodes to antinodes. The
good agreement between the simulation and experiments demonstrates the predictive capability
of the present spatial sectional model for the standing-conditioned agglomeration. The second
case incorporates sound attenuation in the particulate medium into acoustic agglomeration. Results
indicate that sound attenuation can influence acoustic agglomeration significantly, particularly at
high frequencies, and neglecting the effects of sound attenuation can cause overprediction of
agglomeration rates. The present investigation demonstrates that the spatial sectional method is
capable of simulating the spatially nonhomogeneous acoustic agglomeration with high computation efficiency and numerical robustness and the coupling with flow dynamics will be the goal of
future work. |
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