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Title: Extension of a coarse grained particle method to simulate heat transfer in fluidized beds

Abstract

The heat transfer in a gas-solids fluidized bed is simulated with computational fluid dynamic-discrete element method (CFD-DEM) and coarse grained particle method (CGPM). In CGPM fewer numerical particles and their collisions are tracked by lumping several real particles into a computational parcel. Here, the assumption is that the real particles inside a coarse grained particle (CGP) are made from same species and share identical physical properties including density, diameter and temperature. The parcel-fluid convection term in CGPM is calculated using the same method as in DEM. For all other heat transfer mechanisms, we derive in this study mathematical expressions that relate the new heat transfer terms for CGPM to those traditionally derived in DEM. This newly derived CGPM model is verified and validated by comparing the results with CFD-DEM simulation results and experiment data. The numerical results compare well with experimental data for both hydrodynamics and temperature profiles. Finally, the proposed CGPM model can be used for fast and accurate simulations of heat transfer in large scale gas-solids fluidized beds.

Authors:
 [1];  [1];  [2];  [1]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE
OSTI Identifier:
1402455
Alternate Identifier(s):
OSTI ID: 1397099
Report Number(s):
NETL-PUB-20845
Journal ID: ISSN 0017-9310; PII: S0017931016333129
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 111; Journal Issue: C; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 01 COAL, LIGNITE, AND PEAT; Computational fluid dynamics; discrete element method; coarse grained particle method; CFD-DEM; heat transfer

Citation Formats

Lu, Liqiang, Morris, Aaron, Li, Tingwen, and Benyahia, Sofiane. Extension of a coarse grained particle method to simulate heat transfer in fluidized beds. United States: N. p., 2017. Web. doi:10.1016/j.ijheatmasstransfer.2017.04.040.
Lu, Liqiang, Morris, Aaron, Li, Tingwen, & Benyahia, Sofiane. Extension of a coarse grained particle method to simulate heat transfer in fluidized beds. United States. doi:10.1016/j.ijheatmasstransfer.2017.04.040.
Lu, Liqiang, Morris, Aaron, Li, Tingwen, and Benyahia, Sofiane. Tue . "Extension of a coarse grained particle method to simulate heat transfer in fluidized beds". United States. doi:10.1016/j.ijheatmasstransfer.2017.04.040. https://www.osti.gov/servlets/purl/1402455.
@article{osti_1402455,
title = {Extension of a coarse grained particle method to simulate heat transfer in fluidized beds},
author = {Lu, Liqiang and Morris, Aaron and Li, Tingwen and Benyahia, Sofiane},
abstractNote = {The heat transfer in a gas-solids fluidized bed is simulated with computational fluid dynamic-discrete element method (CFD-DEM) and coarse grained particle method (CGPM). In CGPM fewer numerical particles and their collisions are tracked by lumping several real particles into a computational parcel. Here, the assumption is that the real particles inside a coarse grained particle (CGP) are made from same species and share identical physical properties including density, diameter and temperature. The parcel-fluid convection term in CGPM is calculated using the same method as in DEM. For all other heat transfer mechanisms, we derive in this study mathematical expressions that relate the new heat transfer terms for CGPM to those traditionally derived in DEM. This newly derived CGPM model is verified and validated by comparing the results with CFD-DEM simulation results and experiment data. The numerical results compare well with experimental data for both hydrodynamics and temperature profiles. Finally, the proposed CGPM model can be used for fast and accurate simulations of heat transfer in large scale gas-solids fluidized beds.},
doi = {10.1016/j.ijheatmasstransfer.2017.04.040},
journal = {International Journal of Heat and Mass Transfer},
number = C,
volume = 111,
place = {United States},
year = {Tue Apr 18 00:00:00 EDT 2017},
month = {Tue Apr 18 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 9works
Citation information provided by
Web of Science

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  • Vortex chambers allow the generation of rotating fluidized beds, offering high-G intensified gas-solid contact, gas-solids separation and solids-solids segregation. Focusing on binary particle mixtures and fixing the density and diameter of the heavy/large particles, transient batch CFD-coarse-grained DPM simulations were carried out with varying densities or sizes of the light/small particles to evaluate to what extent combining these three functionalities is possible within a vortex chamber of given design. Both the rate and quality of segregation were analyzed. Within a relatively wide density and size range, fast and efficient segregation takes place, with an inner and slower rotating bed ofmore » the lighter/small particles forming within the outer and faster rotating bed of the heavier/large particles. Simulations show that the contamination of the outer bed with lighter particles occurs more easily than contamination of the inner bed with heavier particles and increases with decreasing difference in size or density of the particles. Bubbling in the inner bed is observed with an inner bed of very low density or small particles. Porosity plots show that vortex chambers with a sufficient number of gas inlet slots have to be used to guarantee a uniform gas distribution and particle bed. Lastly, the flexibility of particle segregation in vortex chambers with respect to the gas flow rate is demonstrated.« less
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