Wall function model for particulate fouling applying XDLVO theory

Ulla Ojaniemi (Corresponding Author), M. Riihimäki, Mikko Manninen, Timo Pättikangas

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

A computational fluid dynamics (CFD) model for particulate fouling in heat exchangers has been developed. Particulate fouling is generally considered as a serial process of the transport of the particles into the vicinity of the wall and the adherence on the surface. Particle adhesion on the surface is described by a mass transfer coefficient based on the XDLVO theory. For modelling particle transport, the generally accepted models were applied. A wall function approach was developed for calculating the near-wall particle transport in order to avoid the use of excessively small computational cells. The model is based on the assumption of local equilibrium of the forces affecting the particle transport. The wall function model is compared to a detailed CFD model and to experimental results from a fouling test apparatus using the assumption of a smooth and already fouled surface. Comparisons were made with several heat fluxes and mass flow rates applying various high concentrations of colloidal calcium carbonate (CaCO3) particles suspended in water. Results of simulations are in fairly good agreement with measurements. The wall function model allows the applications of coarser computational grids and therefore modelling of practical industrial heat exchangers.
Original languageEnglish
Pages (from-to)57-69
Number of pages12
JournalChemical Engineering Science
Volume84
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Wall function
Fouling
Heat exchangers
Dynamic models
Computational fluid dynamics
Calcium Carbonate
Calcium carbonate
Heat flux
Adhesion
Mass transfer
Flow rate
Water

Keywords

  • Computation
  • fouling
  • heat exhanger
  • multiphase flow
  • particulate
  • XDLVO

Cite this

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title = "Wall function model for particulate fouling applying XDLVO theory",
abstract = "A computational fluid dynamics (CFD) model for particulate fouling in heat exchangers has been developed. Particulate fouling is generally considered as a serial process of the transport of the particles into the vicinity of the wall and the adherence on the surface. Particle adhesion on the surface is described by a mass transfer coefficient based on the XDLVO theory. For modelling particle transport, the generally accepted models were applied. A wall function approach was developed for calculating the near-wall particle transport in order to avoid the use of excessively small computational cells. The model is based on the assumption of local equilibrium of the forces affecting the particle transport. The wall function model is compared to a detailed CFD model and to experimental results from a fouling test apparatus using the assumption of a smooth and already fouled surface. Comparisons were made with several heat fluxes and mass flow rates applying various high concentrations of colloidal calcium carbonate (CaCO3) particles suspended in water. Results of simulations are in fairly good agreement with measurements. The wall function model allows the applications of coarser computational grids and therefore modelling of practical industrial heat exchangers.",
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author = "Ulla Ojaniemi and M. Riihim{\"a}ki and Mikko Manninen and Timo P{\"a}ttikangas",
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language = "English",
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pages = "57--69",
journal = "Chemical Engineering Science",
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Wall function model for particulate fouling applying XDLVO theory. / Ojaniemi, Ulla (Corresponding Author); Riihimäki, M.; Manninen, Mikko; Pättikangas, Timo.

In: Chemical Engineering Science, Vol. 84, 2012, p. 57-69.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Wall function model for particulate fouling applying XDLVO theory

AU - Ojaniemi, Ulla

AU - Riihimäki, M.

AU - Manninen, Mikko

AU - Pättikangas, Timo

PY - 2012

Y1 - 2012

N2 - A computational fluid dynamics (CFD) model for particulate fouling in heat exchangers has been developed. Particulate fouling is generally considered as a serial process of the transport of the particles into the vicinity of the wall and the adherence on the surface. Particle adhesion on the surface is described by a mass transfer coefficient based on the XDLVO theory. For modelling particle transport, the generally accepted models were applied. A wall function approach was developed for calculating the near-wall particle transport in order to avoid the use of excessively small computational cells. The model is based on the assumption of local equilibrium of the forces affecting the particle transport. The wall function model is compared to a detailed CFD model and to experimental results from a fouling test apparatus using the assumption of a smooth and already fouled surface. Comparisons were made with several heat fluxes and mass flow rates applying various high concentrations of colloidal calcium carbonate (CaCO3) particles suspended in water. Results of simulations are in fairly good agreement with measurements. The wall function model allows the applications of coarser computational grids and therefore modelling of practical industrial heat exchangers.

AB - A computational fluid dynamics (CFD) model for particulate fouling in heat exchangers has been developed. Particulate fouling is generally considered as a serial process of the transport of the particles into the vicinity of the wall and the adherence on the surface. Particle adhesion on the surface is described by a mass transfer coefficient based on the XDLVO theory. For modelling particle transport, the generally accepted models were applied. A wall function approach was developed for calculating the near-wall particle transport in order to avoid the use of excessively small computational cells. The model is based on the assumption of local equilibrium of the forces affecting the particle transport. The wall function model is compared to a detailed CFD model and to experimental results from a fouling test apparatus using the assumption of a smooth and already fouled surface. Comparisons were made with several heat fluxes and mass flow rates applying various high concentrations of colloidal calcium carbonate (CaCO3) particles suspended in water. Results of simulations are in fairly good agreement with measurements. The wall function model allows the applications of coarser computational grids and therefore modelling of practical industrial heat exchangers.

KW - Computation

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KW - heat exhanger

KW - multiphase flow

KW - particulate

KW - XDLVO

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JO - Chemical Engineering Science

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SN - 0009-2509

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