Terminal settling velocity and drag coefficient of biofilm-coated particles at high Reynolds numbers

Mehran Andalib; Jesse Zhu; George Nakhla

doi:10.1002/aic.12184

Terminal settling velocity and drag coefficient of biofilm-coated particles at high Reynolds numbers

Mehran Andalib, Jesse Zhu, George Nakhla

Research output: Journal Publication › Article › peer-review

23 Citations (Scopus)

Abstract

The drag force (F_d) on bio-coated particles taken from two laboratory-scale liquid-solid circulating fluidized bed bioreactors (LSCFBBR) was studied. The terminal velocities (u_t) and Reynolds numbers (Re_t) of particles observed were higher than reported in the literature. Literature equations for determining u_t were found inadequate to predict drag coefficient (C_d) in Re_t > 130. A new equation for determining F_d as an explicit function of terminal settling velocity was generated based on Archimedes numbers (Ar) of the biofilm-coated particle. The proposed equation adequately predicted the terminal settling velocity of other literature data at lower Re_t of less than 130, with an accuracy >85%.

Original language	English
Pages (from-to)	2598-2606
Number of pages	9
Journal	AICHE Journal
Volume	56
Issue number	10
DOIs	https://doi.org/10.1002/aic.12184
Publication status	Published - Oct 2010
Externally published	Yes

Keywords

Archimedes number
Biofilm-coated particles
Circulating fluidized bed bioreactor
Drag coefficient
Reynolds number
Terminal settling velocity

ASJC Scopus subject areas

Biotechnology
Environmental Engineering
General Chemical Engineering

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10.1002/aic.12184

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title = "Terminal settling velocity and drag coefficient of biofilm-coated particles at high Reynolds numbers",

abstract = "The drag force (Fd) on bio-coated particles taken from two laboratory-scale liquid-solid circulating fluidized bed bioreactors (LSCFBBR) was studied. The terminal velocities (ut) and Reynolds numbers (Ret) of particles observed were higher than reported in the literature. Literature equations for determining ut were found inadequate to predict drag coefficient (Cd) in Ret > 130. A new equation for determining Fd as an explicit function of terminal settling velocity was generated based on Archimedes numbers (Ar) of the biofilm-coated particle. The proposed equation adequately predicted the terminal settling velocity of other literature data at lower Ret of less than 130, with an accuracy >85%.",

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AU - Andalib, Mehran

AU - Zhu, Jesse

AU - Nakhla, George

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N2 - The drag force (Fd) on bio-coated particles taken from two laboratory-scale liquid-solid circulating fluidized bed bioreactors (LSCFBBR) was studied. The terminal velocities (ut) and Reynolds numbers (Ret) of particles observed were higher than reported in the literature. Literature equations for determining ut were found inadequate to predict drag coefficient (Cd) in Ret > 130. A new equation for determining Fd as an explicit function of terminal settling velocity was generated based on Archimedes numbers (Ar) of the biofilm-coated particle. The proposed equation adequately predicted the terminal settling velocity of other literature data at lower Ret of less than 130, with an accuracy >85%.

AB - The drag force (Fd) on bio-coated particles taken from two laboratory-scale liquid-solid circulating fluidized bed bioreactors (LSCFBBR) was studied. The terminal velocities (ut) and Reynolds numbers (Ret) of particles observed were higher than reported in the literature. Literature equations for determining ut were found inadequate to predict drag coefficient (Cd) in Ret > 130. A new equation for determining Fd as an explicit function of terminal settling velocity was generated based on Archimedes numbers (Ar) of the biofilm-coated particle. The proposed equation adequately predicted the terminal settling velocity of other literature data at lower Ret of less than 130, with an accuracy >85%.

KW - Archimedes number

KW - Biofilm-coated particles

KW - Circulating fluidized bed bioreactor

KW - Drag coefficient

KW - Reynolds number

KW - Terminal settling velocity

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Terminal settling velocity and drag coefficient of biofilm-coated particles at high Reynolds numbers

Abstract

Keywords

ASJC Scopus subject areas

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