Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks
Abstract
Our team applies a two-fluid model (TFM) from the open-source code Multiphase Flow with Interphase eXchanges (MFIX) to investigate hydrodynamics in a gas–solids fluidized bed with immersed vertical tubes. The cut-cell method implemented in MFIX is used to fully resolve the flow around vertical U-tube banks. Simulations are performed in a bed diameter of 0.145 m with square and triangular tube arrangements, for inlet gas velocities of U0/Umf = 2.3, 4.5 and 6.8. Simulation results are compared with experimental results from the literature and show very good agreement for the bubble size. The efficiency of vertical tubes in reducing bubble size depends upon inlet gas velocity and tube arrangement. Reduction in bubble size is due to the vertical tubes preventing bubble coalescence and promoting bubble splitting. In-bed vertical tubes result in uniform distribution of bubbles within the bed with increase in bubble frequency. The bubble frequency is higher within the bed for square tube arrangements. For a bed with vertical tubes, the bubble shape is generally elongated, which results in high bubble rise velocity. Axial solid velocity and solids circulation patterns are significantly affected by the vertical tubes, where triangular tube arrangements rarely show any solids circulating zone.
- Authors:
-
- National Energy Technology Lab. (NETL), Morgantown, WV (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States) ; AECOM Energy & Construction, Inc., Cleveland, OH (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
- Publication Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1478627
- Alternate Identifier(s):
- OSTI ID: 1358908
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Engineering Journal
- Additional Journal Information:
- Journal Volume: 287; Journal Issue: C; Journal ID: ISSN 1385-8947
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Fluidized beds; Vertical tubes; Two-fluid model; Hydrodynamics; Bubble
Citation Formats
Verma, Vikrant, Li, Tingwen, Dietiker, Jean-François, and Rogers, William A. Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks. United States: N. p., 2016.
Web. doi:10.1016/j.cej.2015.11.049.
Verma, Vikrant, Li, Tingwen, Dietiker, Jean-François, & Rogers, William A. Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks. United States. https://doi.org/10.1016/j.cej.2015.11.049
Verma, Vikrant, Li, Tingwen, Dietiker, Jean-François, and Rogers, William A. Tue .
"Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks". United States. https://doi.org/10.1016/j.cej.2015.11.049. https://www.osti.gov/servlets/purl/1478627.
@article{osti_1478627,
title = {Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks},
author = {Verma, Vikrant and Li, Tingwen and Dietiker, Jean-François and Rogers, William A.},
abstractNote = {Our team applies a two-fluid model (TFM) from the open-source code Multiphase Flow with Interphase eXchanges (MFIX) to investigate hydrodynamics in a gas–solids fluidized bed with immersed vertical tubes. The cut-cell method implemented in MFIX is used to fully resolve the flow around vertical U-tube banks. Simulations are performed in a bed diameter of 0.145 m with square and triangular tube arrangements, for inlet gas velocities of U0/Umf = 2.3, 4.5 and 6.8. Simulation results are compared with experimental results from the literature and show very good agreement for the bubble size. The efficiency of vertical tubes in reducing bubble size depends upon inlet gas velocity and tube arrangement. Reduction in bubble size is due to the vertical tubes preventing bubble coalescence and promoting bubble splitting. In-bed vertical tubes result in uniform distribution of bubbles within the bed with increase in bubble frequency. The bubble frequency is higher within the bed for square tube arrangements. For a bed with vertical tubes, the bubble shape is generally elongated, which results in high bubble rise velocity. Axial solid velocity and solids circulation patterns are significantly affected by the vertical tubes, where triangular tube arrangements rarely show any solids circulating zone.},
doi = {10.1016/j.cej.2015.11.049},
journal = {Chemical Engineering Journal},
number = C,
volume = 287,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 2016},
month = {Tue Mar 01 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Experimental and Numerical Investigations on Heat Transfer of Bare Tubes in a Bubbling Fluidized Bed with Respect to Better Heat Integration in Temperature Swing Adsorption Systems
journal, July 2019
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- Energies, Vol. 12, Issue 14