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Title: Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations

Abstract

The accuracy of fluidized-bed CFD predictions using the two-fluid model can be improved significantly, even when using coarse grids, by replacing the microscopic kinetic-theory-based closures with coarse-grained constitutive models. These coarse-grained constitutive relationships, called filtered models, account for the unresolved gas-particle structures (clusters and bubbles) via sub-grid corrections. Following the previous 2-D approaches of Igci et al. [AIChE J., 54(6), 1431-1448, 2008] and Milioli et al. [AIChE J., 59(9), 3265-3275, 2013], new filtered models are constructed from highly-resolved 3-D simulations of gas-particle flows. Although qualitatively similar to the older 2-D models, the new 3-D relationships exhibit noticeable quantitative and functional differences. In particular, the filtered stresses are strongly dependent on the gas-particle slip velocity. Closures for the filtered inter-phase drag, gas- and solids-phase pressures and viscosities are reported. A new model for solids stress anisotropy is also presented. These new filtered 3-D constitutive relationships are better suited to practical coarse-grid 3-D simulations of large, commercial-scale devices.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340849
Report Number(s):
PNNL-SA-113106
Journal ID: ISSN 0009-2509; AA9010100
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemical Engineering Science
Additional Journal Information:
Journal Volume: 152; Journal ID: ISSN 0009-2509
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Sarkar, Avik, Milioli, Fernando E., Ozarkar, Shailesh, Li, Tingwen, Sun, Xin, and Sundaresan, Sankaran. Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations. United States: N. p., 2016. Web. doi:10.1016/j.ces.2016.06.023.
Sarkar, Avik, Milioli, Fernando E., Ozarkar, Shailesh, Li, Tingwen, Sun, Xin, & Sundaresan, Sankaran. Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations. United States. https://doi.org/10.1016/j.ces.2016.06.023
Sarkar, Avik, Milioli, Fernando E., Ozarkar, Shailesh, Li, Tingwen, Sun, Xin, and Sundaresan, Sankaran. 2016. "Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations". United States. https://doi.org/10.1016/j.ces.2016.06.023.
@article{osti_1340849,
title = {Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations},
author = {Sarkar, Avik and Milioli, Fernando E. and Ozarkar, Shailesh and Li, Tingwen and Sun, Xin and Sundaresan, Sankaran},
abstractNote = {The accuracy of fluidized-bed CFD predictions using the two-fluid model can be improved significantly, even when using coarse grids, by replacing the microscopic kinetic-theory-based closures with coarse-grained constitutive models. These coarse-grained constitutive relationships, called filtered models, account for the unresolved gas-particle structures (clusters and bubbles) via sub-grid corrections. Following the previous 2-D approaches of Igci et al. [AIChE J., 54(6), 1431-1448, 2008] and Milioli et al. [AIChE J., 59(9), 3265-3275, 2013], new filtered models are constructed from highly-resolved 3-D simulations of gas-particle flows. Although qualitatively similar to the older 2-D models, the new 3-D relationships exhibit noticeable quantitative and functional differences. In particular, the filtered stresses are strongly dependent on the gas-particle slip velocity. Closures for the filtered inter-phase drag, gas- and solids-phase pressures and viscosities are reported. A new model for solids stress anisotropy is also presented. These new filtered 3-D constitutive relationships are better suited to practical coarse-grid 3-D simulations of large, commercial-scale devices.},
doi = {10.1016/j.ces.2016.06.023},
url = {https://www.osti.gov/biblio/1340849}, journal = {Chemical Engineering Science},
issn = {0009-2509},
number = ,
volume = 152,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}