Shell-side dispersion coefficients in a rectangular cross-flow hollow fibre membrane module

V.Y. Dindore, A.H.G. Cents, Derk Willem Frederik Brilman, Geert Versteeg

  • 10 Citations

Abstract

Received 8 June 2004; accepted 28 October 2004. Available online 14 February 2008. Membrane processes utilizing hollow fibre membrane modules are gaining increased interest in many industrial applications. However, these modules suffer from shell-side maldistribution and bypassing which results in a loss in efficiency. The shell-side mass transfer performance of these membrane modules strongly depends on the shell-side mixing and the shell geometry. In literature limited information is available on the shell-side mixing of hollow fibre membrane modules. In the present work, shell-side mixing of a rectangular cross-flow hollow fibre membrane contactor is investigated using gas-phase RTD measurements. A novel ultrasound based measurement technique was used to characterize the system. The shell-side mixing of the module is determined in terms of dispersion coefficients in three directions. The axial dispersion coefficient is found to have values between those applicable to pipe-flow and packed bed correlations. This can be attributed to the intermediate packing density of the membrane module. The dispersion in transversal directions, along and across the fibres, is significantly lower compared to that of the axial dispersion. The transversal dispersion coefficient across the fibre is higher and more sensitive to the shell-side velocity compared to the dispersion coefficient along the fibre due to the continuous splitting and remixing of shell-side flow across the fibres.
Original languageUndefined
Pages (from-to)317-325
Number of pages9
JournalChemical engineering research and design (Transactions of the Institution of Chemical Engineers, part A)
Volume83
Issue number3A
DOIs
StatePublished - 2005

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Fibers
Membranes
Gas fuel measurement
Phase measurement
Pipe flow
Packed beds
Industrial applications
Mass transfer
Ultrasonics
Geometry

Keywords

  • Mixing
  • Membrane contactor
  • RTD
  • IR-76644
  • hollow fibre membranes
  • METIS-226425
  • dispersion model

Cite this

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title = "Shell-side dispersion coefficients in a rectangular cross-flow hollow fibre membrane module",
abstract = "Received 8 June 2004; accepted 28 October 2004. Available online 14 February 2008. Membrane processes utilizing hollow fibre membrane modules are gaining increased interest in many industrial applications. However, these modules suffer from shell-side maldistribution and bypassing which results in a loss in efficiency. The shell-side mass transfer performance of these membrane modules strongly depends on the shell-side mixing and the shell geometry. In literature limited information is available on the shell-side mixing of hollow fibre membrane modules. In the present work, shell-side mixing of a rectangular cross-flow hollow fibre membrane contactor is investigated using gas-phase RTD measurements. A novel ultrasound based measurement technique was used to characterize the system. The shell-side mixing of the module is determined in terms of dispersion coefficients in three directions. The axial dispersion coefficient is found to have values between those applicable to pipe-flow and packed bed correlations. This can be attributed to the intermediate packing density of the membrane module. The dispersion in transversal directions, along and across the fibres, is significantly lower compared to that of the axial dispersion. The transversal dispersion coefficient across the fibre is higher and more sensitive to the shell-side velocity compared to the dispersion coefficient along the fibre due to the continuous splitting and remixing of shell-side flow across the fibres.",
keywords = "Mixing, Membrane contactor, RTD, IR-76644, hollow fibre membranes, METIS-226425, dispersion model",
author = "V.Y. Dindore and A.H.G. Cents and Brilman, {Derk Willem Frederik} and Geert Versteeg",
year = "2005",
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journal = "Chemical engineering research and design (Transactions of the Institution of Chemical Engineers, part A)",
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T1 - Shell-side dispersion coefficients in a rectangular cross-flow hollow fibre membrane module

AU - Dindore,V.Y.

AU - Cents,A.H.G.

AU - Brilman,Derk Willem Frederik

AU - Versteeg,Geert

PY - 2005

Y1 - 2005

N2 - Received 8 June 2004; accepted 28 October 2004. Available online 14 February 2008. Membrane processes utilizing hollow fibre membrane modules are gaining increased interest in many industrial applications. However, these modules suffer from shell-side maldistribution and bypassing which results in a loss in efficiency. The shell-side mass transfer performance of these membrane modules strongly depends on the shell-side mixing and the shell geometry. In literature limited information is available on the shell-side mixing of hollow fibre membrane modules. In the present work, shell-side mixing of a rectangular cross-flow hollow fibre membrane contactor is investigated using gas-phase RTD measurements. A novel ultrasound based measurement technique was used to characterize the system. The shell-side mixing of the module is determined in terms of dispersion coefficients in three directions. The axial dispersion coefficient is found to have values between those applicable to pipe-flow and packed bed correlations. This can be attributed to the intermediate packing density of the membrane module. The dispersion in transversal directions, along and across the fibres, is significantly lower compared to that of the axial dispersion. The transversal dispersion coefficient across the fibre is higher and more sensitive to the shell-side velocity compared to the dispersion coefficient along the fibre due to the continuous splitting and remixing of shell-side flow across the fibres.

AB - Received 8 June 2004; accepted 28 October 2004. Available online 14 February 2008. Membrane processes utilizing hollow fibre membrane modules are gaining increased interest in many industrial applications. However, these modules suffer from shell-side maldistribution and bypassing which results in a loss in efficiency. The shell-side mass transfer performance of these membrane modules strongly depends on the shell-side mixing and the shell geometry. In literature limited information is available on the shell-side mixing of hollow fibre membrane modules. In the present work, shell-side mixing of a rectangular cross-flow hollow fibre membrane contactor is investigated using gas-phase RTD measurements. A novel ultrasound based measurement technique was used to characterize the system. The shell-side mixing of the module is determined in terms of dispersion coefficients in three directions. The axial dispersion coefficient is found to have values between those applicable to pipe-flow and packed bed correlations. This can be attributed to the intermediate packing density of the membrane module. The dispersion in transversal directions, along and across the fibres, is significantly lower compared to that of the axial dispersion. The transversal dispersion coefficient across the fibre is higher and more sensitive to the shell-side velocity compared to the dispersion coefficient along the fibre due to the continuous splitting and remixing of shell-side flow across the fibres.

KW - Mixing

KW - Membrane contactor

KW - RTD

KW - IR-76644

KW - hollow fibre membranes

KW - METIS-226425

KW - dispersion model

U2 - 10.1205/cherd.04166

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M3 - Article

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JO - Chemical engineering research and design (Transactions of the Institution of Chemical Engineers, part A)

T2 - Chemical engineering research and design (Transactions of the Institution of Chemical Engineers, part A)

JF - Chemical engineering research and design (Transactions of the Institution of Chemical Engineers, part A)

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