Modelling of liquid dispersion in trickle-bed reactors

Capillary pressure gradients and mechanical dispersion

K. Lappalainen, V. Alopaeus, Mikko Manninen, Sirpa Kallio

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Modelling is one of the most significant prospective tools for design and analysis of trickle-bed reactors. Unfortunately, current hydrodynamic models, developed on laboratory experiments, often work poorly in industrial scale. Therefore, physically, more authentic models are required in which the small-scale phenomena are separated from the large-scale phenomena. This would improve the scale-up of the model and consequently, its applicability to industrial-scale reactors. One of the small-scale phenomena lacking from the current models is radial distribution of liquid. It has not been considered in the model development, although it is commonly thought that liquid flow is radially more uniform in industrial than in laboratory scale. Here, models for liquid distribution, caused by capillary pressure gradients and mechanical dispersion, are suggested and the outline of the implementation of these models to CFD programs is presented. Laboratory experiments and CFD simulations of the experimental setup are performed to gain better understanding about liquid radial distribution. The physical validity of the presented models is assessed on the consistency between the experimental and the modelled liquid flow profiles.
Original languageEnglish
Pages (from-to) 65-79
Number of pages15
JournalMultiphase Science and Technology
Volume21
Issue number1-2
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Capillarity
Pressure Gradient
Pressure gradient
pressure gradients
Reactor
beds
reactors
Liquid
Liquids
liquids
Modeling
Liquid Flow
liquid flow
charge flow devices
radial distribution
Model
Computational fluid dynamics
CFD Simulation
Scale-up
Hydrodynamic Model

Keywords

  • trickle bed reactors
  • hydrodynamics
  • modelling
  • CFD
  • CFD modeling
  • computational fluid dynamics

Cite this

@article{ff12daf1503249479469dd3dfb5244a6,
title = "Modelling of liquid dispersion in trickle-bed reactors: Capillary pressure gradients and mechanical dispersion",
abstract = "Modelling is one of the most significant prospective tools for design and analysis of trickle-bed reactors. Unfortunately, current hydrodynamic models, developed on laboratory experiments, often work poorly in industrial scale. Therefore, physically, more authentic models are required in which the small-scale phenomena are separated from the large-scale phenomena. This would improve the scale-up of the model and consequently, its applicability to industrial-scale reactors. One of the small-scale phenomena lacking from the current models is radial distribution of liquid. It has not been considered in the model development, although it is commonly thought that liquid flow is radially more uniform in industrial than in laboratory scale. Here, models for liquid distribution, caused by capillary pressure gradients and mechanical dispersion, are suggested and the outline of the implementation of these models to CFD programs is presented. Laboratory experiments and CFD simulations of the experimental setup are performed to gain better understanding about liquid radial distribution. The physical validity of the presented models is assessed on the consistency between the experimental and the modelled liquid flow profiles.",
keywords = "trickle bed reactors, hydrodynamics, modelling, CFD, CFD modeling, computational fluid dynamics",
author = "K. Lappalainen and V. Alopaeus and Mikko Manninen and Sirpa Kallio",
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language = "English",
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journal = "Multiphase Science and Technology",
issn = "0276-1459",
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}

Modelling of liquid dispersion in trickle-bed reactors : Capillary pressure gradients and mechanical dispersion. / Lappalainen, K.; Alopaeus, V.; Manninen, Mikko; Kallio, Sirpa.

In: Multiphase Science and Technology, Vol. 21, No. 1-2, 2009, p. 65-79.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modelling of liquid dispersion in trickle-bed reactors

T2 - Capillary pressure gradients and mechanical dispersion

AU - Lappalainen, K.

AU - Alopaeus, V.

AU - Manninen, Mikko

AU - Kallio, Sirpa

PY - 2009

Y1 - 2009

N2 - Modelling is one of the most significant prospective tools for design and analysis of trickle-bed reactors. Unfortunately, current hydrodynamic models, developed on laboratory experiments, often work poorly in industrial scale. Therefore, physically, more authentic models are required in which the small-scale phenomena are separated from the large-scale phenomena. This would improve the scale-up of the model and consequently, its applicability to industrial-scale reactors. One of the small-scale phenomena lacking from the current models is radial distribution of liquid. It has not been considered in the model development, although it is commonly thought that liquid flow is radially more uniform in industrial than in laboratory scale. Here, models for liquid distribution, caused by capillary pressure gradients and mechanical dispersion, are suggested and the outline of the implementation of these models to CFD programs is presented. Laboratory experiments and CFD simulations of the experimental setup are performed to gain better understanding about liquid radial distribution. The physical validity of the presented models is assessed on the consistency between the experimental and the modelled liquid flow profiles.

AB - Modelling is one of the most significant prospective tools for design and analysis of trickle-bed reactors. Unfortunately, current hydrodynamic models, developed on laboratory experiments, often work poorly in industrial scale. Therefore, physically, more authentic models are required in which the small-scale phenomena are separated from the large-scale phenomena. This would improve the scale-up of the model and consequently, its applicability to industrial-scale reactors. One of the small-scale phenomena lacking from the current models is radial distribution of liquid. It has not been considered in the model development, although it is commonly thought that liquid flow is radially more uniform in industrial than in laboratory scale. Here, models for liquid distribution, caused by capillary pressure gradients and mechanical dispersion, are suggested and the outline of the implementation of these models to CFD programs is presented. Laboratory experiments and CFD simulations of the experimental setup are performed to gain better understanding about liquid radial distribution. The physical validity of the presented models is assessed on the consistency between the experimental and the modelled liquid flow profiles.

KW - trickle bed reactors

KW - hydrodynamics

KW - modelling

KW - CFD

KW - CFD modeling

KW - computational fluid dynamics

U2 - 10.1615/MultScienTechn.v21.i1-2.60

DO - 10.1615/MultScienTechn.v21.i1-2.60

M3 - Article

VL - 21

SP - 65

EP - 79

JO - Multiphase Science and Technology

JF - Multiphase Science and Technology

SN - 0276-1459

IS - 1-2

ER -