Development of a multiphase solver for numerical simulations of thermally driven marangoni flows

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

Thermocapillary flows, also known as thermal Marangoni flows, have extensive applications in a variety of different fields. Applications can be found in metal welding, growth of crystals and processing of alloys (both organic and metallic). They also have significant implications in the study of multilayer non-isothermal configurations, as well as microdroplet migration and coalescence. In this work we discuss the implementation of a non-isothermal multiphase solver based on Volume of Fluid (VOF) implemented within the open source toolbox OpenFOAM® for the numerical simulation of such flows. Interfacial tension gradients may appear consequently of a non-uniform temperature distribution along a free liquid-liquid or liquid-gas interface. The imbalance of tensile stresses, which derives from such circumstances, generates a fluid motion even in absence of any other force or external pressure gradients. The interfacial stresses are modelled via an additional body force term added to the momentum equation using a “Continuum Surface Force” (CSF) model (Brackbill et al. 1992). An energy transport equation is also solved in order to determine the temperature field evolution, which in turn influences the flow field through the Marangoni forces herein considered. To date, our solver has been tested in 2D configurations of thermally driven stratified flows. We compared our numerical simulations using a well-established code (Lappa, 2005) and good agreement was found in terms of velocity and temperature fields. Next, we aim to extend our simulations to more complex flow configurations and to consider the effect of the Marangoni stresses in non-Newtonian viscoelastic flows under non-isothermal conditions.
LanguageEnglish
Title of host publicationThe 29th Scottish Fluid Mechanics Meeting, Book of Abstracts
Place of PublicationEdinburgh, UK
Pages15
Number of pages1
Publication statusPublished - 20 May 2016

Fingerprint

Temperature distribution
Computer simulation
Liquids
Non Newtonian flow
Fluids
Crystallization
Pressure gradient
Coalescence
Tensile stress
Surface tension
Flow fields
Momentum
Multilayers
Welding
Gases
Metals
Crystals
Processing
Hot Temperature

Keywords

  • Marangoni flows
  • OpenFOAM
  • droplet migration

Cite this

Capobianchi, P., Lappa, M., & Oliveira, M. (2016). Development of a multiphase solver for numerical simulations of thermally driven marangoni flows. In The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts (pp. 15). Edinburgh, UK.
@inproceedings{0af8cdac68cf4f48bdd00d54f721451a,
title = "Development of a multiphase solver for numerical simulations of thermally driven marangoni flows",
abstract = "Thermocapillary flows, also known as thermal Marangoni flows, have extensive applications in a variety of different fields. Applications can be found in metal welding, growth of crystals and processing of alloys (both organic and metallic). They also have significant implications in the study of multilayer non-isothermal configurations, as well as microdroplet migration and coalescence. In this work we discuss the implementation of a non-isothermal multiphase solver based on Volume of Fluid (VOF) implemented within the open source toolbox OpenFOAM{\circledR} for the numerical simulation of such flows. Interfacial tension gradients may appear consequently of a non-uniform temperature distribution along a free liquid-liquid or liquid-gas interface. The imbalance of tensile stresses, which derives from such circumstances, generates a fluid motion even in absence of any other force or external pressure gradients. The interfacial stresses are modelled via an additional body force term added to the momentum equation using a “Continuum Surface Force” (CSF) model (Brackbill et al. 1992). An energy transport equation is also solved in order to determine the temperature field evolution, which in turn influences the flow field through the Marangoni forces herein considered. To date, our solver has been tested in 2D configurations of thermally driven stratified flows. We compared our numerical simulations using a well-established code (Lappa, 2005) and good agreement was found in terms of velocity and temperature fields. Next, we aim to extend our simulations to more complex flow configurations and to consider the effect of the Marangoni stresses in non-Newtonian viscoelastic flows under non-isothermal conditions.",
keywords = "Marangoni flows, OpenFOAM, droplet migration",
author = "Paolo Capobianchi and Marcello Lappa and Monica Oliveira",
year = "2016",
month = "5",
day = "20",
language = "English",
pages = "15",
booktitle = "The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts",

}

Capobianchi, P, Lappa, M & Oliveira, M 2016, Development of a multiphase solver for numerical simulations of thermally driven marangoni flows. in The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts. Edinburgh, UK, pp. 15.

Development of a multiphase solver for numerical simulations of thermally driven marangoni flows. / Capobianchi, Paolo; Lappa, Marcello; Oliveira, Monica.

The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts. Edinburgh, UK, 2016. p. 15.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

TY - GEN

T1 - Development of a multiphase solver for numerical simulations of thermally driven marangoni flows

AU - Capobianchi, Paolo

AU - Lappa, Marcello

AU - Oliveira, Monica

PY - 2016/5/20

Y1 - 2016/5/20

N2 - Thermocapillary flows, also known as thermal Marangoni flows, have extensive applications in a variety of different fields. Applications can be found in metal welding, growth of crystals and processing of alloys (both organic and metallic). They also have significant implications in the study of multilayer non-isothermal configurations, as well as microdroplet migration and coalescence. In this work we discuss the implementation of a non-isothermal multiphase solver based on Volume of Fluid (VOF) implemented within the open source toolbox OpenFOAM® for the numerical simulation of such flows. Interfacial tension gradients may appear consequently of a non-uniform temperature distribution along a free liquid-liquid or liquid-gas interface. The imbalance of tensile stresses, which derives from such circumstances, generates a fluid motion even in absence of any other force or external pressure gradients. The interfacial stresses are modelled via an additional body force term added to the momentum equation using a “Continuum Surface Force” (CSF) model (Brackbill et al. 1992). An energy transport equation is also solved in order to determine the temperature field evolution, which in turn influences the flow field through the Marangoni forces herein considered. To date, our solver has been tested in 2D configurations of thermally driven stratified flows. We compared our numerical simulations using a well-established code (Lappa, 2005) and good agreement was found in terms of velocity and temperature fields. Next, we aim to extend our simulations to more complex flow configurations and to consider the effect of the Marangoni stresses in non-Newtonian viscoelastic flows under non-isothermal conditions.

AB - Thermocapillary flows, also known as thermal Marangoni flows, have extensive applications in a variety of different fields. Applications can be found in metal welding, growth of crystals and processing of alloys (both organic and metallic). They also have significant implications in the study of multilayer non-isothermal configurations, as well as microdroplet migration and coalescence. In this work we discuss the implementation of a non-isothermal multiphase solver based on Volume of Fluid (VOF) implemented within the open source toolbox OpenFOAM® for the numerical simulation of such flows. Interfacial tension gradients may appear consequently of a non-uniform temperature distribution along a free liquid-liquid or liquid-gas interface. The imbalance of tensile stresses, which derives from such circumstances, generates a fluid motion even in absence of any other force or external pressure gradients. The interfacial stresses are modelled via an additional body force term added to the momentum equation using a “Continuum Surface Force” (CSF) model (Brackbill et al. 1992). An energy transport equation is also solved in order to determine the temperature field evolution, which in turn influences the flow field through the Marangoni forces herein considered. To date, our solver has been tested in 2D configurations of thermally driven stratified flows. We compared our numerical simulations using a well-established code (Lappa, 2005) and good agreement was found in terms of velocity and temperature fields. Next, we aim to extend our simulations to more complex flow configurations and to consider the effect of the Marangoni stresses in non-Newtonian viscoelastic flows under non-isothermal conditions.

KW - Marangoni flows

KW - OpenFOAM

KW - droplet migration

UR - https://sites.google.com/site/scottishfluidmechanics2016/

M3 - Conference contribution book

SP - 15

BT - The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts

CY - Edinburgh, UK

ER -

Capobianchi P, Lappa M, Oliveira M. Development of a multiphase solver for numerical simulations of thermally driven marangoni flows. In The 29th Scottish Fluid Mechanics Meeting, Book of Abstracts. Edinburgh, UK. 2016. p. 15