CFD prediction of scalar transport in thin channels for reverse electrodialysis

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22 Citazioni (Scopus)

Abstract

Reverse ElectroDialysis (RED) is a very promising technology allowing the electrochemical potential difference of a salinity gradient to be directly converted into electric energy. The fluid dynamics optimization of the thin channels used in RED is still an open problem. The present preliminary work focuses on the Computational Fluid Dynamics (CFD) simulation of the flow and concentration fields in these channels. In particular three different configurations were investigated: a channel unprovided with a spacer (empty channel) and two channels filled with spacers, one made of overlapped filaments the other of woven filaments. The transport of two passive scalars, representative of the ions present in the solution, was simulated in order to evaluate concentration polarization phenomena. Computational domain effects were also addressed. Results show that: (i) the adoption of a computational domain limited to a single unit cell along with periodic boundary conditions provides results very close to those obtained in a larger domain; (ii) the woven spacer filled channel is the best compromise between pressure drop and concentration polarization. Future work will address the inclusion of electrical effects along with the migrative transport of the ions in the channel.
Lingua originaleEnglish
pagine (da-a)3424-3445
Numero di pagine22
RivistaDesalination and Water Treatment
Volume55
Stato di pubblicazionePublished - 2015

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Electrodialysis
computational fluid dynamics
Computational fluid dynamics
Polarization
Ions
prediction
Fluid dynamics
Pressure drop
Boundary conditions
Computer simulation
polarization
ion
fluid dynamics
pressure drop
boundary condition
salinity
simulation
energy

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

Cita questo

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title = "CFD prediction of scalar transport in thin channels for reverse electrodialysis",
abstract = "Reverse ElectroDialysis (RED) is a very promising technology allowing the electrochemical potential difference of a salinity gradient to be directly converted into electric energy. The fluid dynamics optimization of the thin channels used in RED is still an open problem. The present preliminary work focuses on the Computational Fluid Dynamics (CFD) simulation of the flow and concentration fields in these channels. In particular three different configurations were investigated: a channel unprovided with a spacer (empty channel) and two channels filled with spacers, one made of overlapped filaments the other of woven filaments. The transport of two passive scalars, representative of the ions present in the solution, was simulated in order to evaluate concentration polarization phenomena. Computational domain effects were also addressed. Results show that: (i) the adoption of a computational domain limited to a single unit cell along with periodic boundary conditions provides results very close to those obtained in a larger domain; (ii) the woven spacer filled channel is the best compromise between pressure drop and concentration polarization. Future work will address the inclusion of electrical effects along with the migrative transport of the ions in the channel.",
author = "Andrea Cipollina and Alessandro Tamburini and Micale, {Giorgio Domenico Maria} and Michele Ciofalo",
year = "2015",
language = "English",
volume = "55",
pages = "3424--3445",
journal = "Desalination and Water Treatment",
issn = "1944-3994",
publisher = "Taylor and Francis Ltd.",

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TY - JOUR

T1 - CFD prediction of scalar transport in thin channels for reverse electrodialysis

AU - Cipollina, Andrea

AU - Tamburini, Alessandro

AU - Micale, Giorgio Domenico Maria

AU - Ciofalo, Michele

PY - 2015

Y1 - 2015

N2 - Reverse ElectroDialysis (RED) is a very promising technology allowing the electrochemical potential difference of a salinity gradient to be directly converted into electric energy. The fluid dynamics optimization of the thin channels used in RED is still an open problem. The present preliminary work focuses on the Computational Fluid Dynamics (CFD) simulation of the flow and concentration fields in these channels. In particular three different configurations were investigated: a channel unprovided with a spacer (empty channel) and two channels filled with spacers, one made of overlapped filaments the other of woven filaments. The transport of two passive scalars, representative of the ions present in the solution, was simulated in order to evaluate concentration polarization phenomena. Computational domain effects were also addressed. Results show that: (i) the adoption of a computational domain limited to a single unit cell along with periodic boundary conditions provides results very close to those obtained in a larger domain; (ii) the woven spacer filled channel is the best compromise between pressure drop and concentration polarization. Future work will address the inclusion of electrical effects along with the migrative transport of the ions in the channel.

AB - Reverse ElectroDialysis (RED) is a very promising technology allowing the electrochemical potential difference of a salinity gradient to be directly converted into electric energy. The fluid dynamics optimization of the thin channels used in RED is still an open problem. The present preliminary work focuses on the Computational Fluid Dynamics (CFD) simulation of the flow and concentration fields in these channels. In particular three different configurations were investigated: a channel unprovided with a spacer (empty channel) and two channels filled with spacers, one made of overlapped filaments the other of woven filaments. The transport of two passive scalars, representative of the ions present in the solution, was simulated in order to evaluate concentration polarization phenomena. Computational domain effects were also addressed. Results show that: (i) the adoption of a computational domain limited to a single unit cell along with periodic boundary conditions provides results very close to those obtained in a larger domain; (ii) the woven spacer filled channel is the best compromise between pressure drop and concentration polarization. Future work will address the inclusion of electrical effects along with the migrative transport of the ions in the channel.

UR - http://hdl.handle.net/10447/98453

M3 - Article

VL - 55

SP - 3424

EP - 3445

JO - Desalination and Water Treatment

JF - Desalination and Water Treatment

SN - 1944-3994

ER -