Effect of external electric fields on thermodynamic properties

Research output: Contribution to conferenceAbstract

Abstract

The efficient use of energy is one the biggest challenges our society faces at the moment and is one of the basic principles of modern chemical engineering. In the case of dielectric materials, microwave heating is known to be a faster and more selective way to transfer energy from a source to a recipient than conventional conduction-based heating. This is due to the volumetric and targeted character of microwave heating, meaning that all the material is heated simultaneously and only substances which respond to the microwave field will be affected. In contrast, conductive heating requires longer times for the energy to be transferred from the surface to the centre of the material.
Microwave technology has seen a significant growth in the last decades with applications such as food processing, pre-heating of rubber and plastics, and drying of different materials. More recently microwave heating has also been applied in organic synthesis, heterogeneous catalytic reactions, polymerization reactions and various separation processes [1]. In all these cases, important improvements have been reported with respect to conventional technologies. However, the physical mechanisms by which this enhancement occurs remain somehow unclear.
In this work, we propose the implementation of a multiscale modelling approach to develop a better understanding of the thermodynamics of systems under the influence of external electric fields. Modified equations of state are used to model the behaviour of such systems, and reproduce previously obtained experimental results. In addition, molecular simulations provide a deeper insight into the dielectric polarization mechanism, and are employed to study the influence of external electric fields on thermodynamic properties, with particular interest in free energies and chemical equilibrium. We start with the application of a static electric field on both one component systems and mixtures, with the goal of extending the analysis to alternating fields at microwave frequencies. In combination with previous work on dielectric spectroscopy of these materials, this study can provide a valuable tool for modelling dielectric heating processes.

Conference

ConferenceAMPERE - 15th International Conference on Microwave and High Frequency Heating
CountryUnited Kingdom
CityKrakow
Period14/09/1517/09/15

Fingerprint

Microwave heating
Thermodynamic properties
Electric fields
Heating
Dielectric heating
Microwaves
Dielectric spectroscopy
Food processing
Microwave frequencies
Chemical engineering
Equations of state
Energy transfer
Free energy
Drying
Rubber
Polymerization
Thermodynamics
Polarization
Plastics

Keywords

  • microwave heating
  • molecular dynamics
  • thermodynamics

Cite this

Cardona, J., & Lue, L. (2015). Effect of external electric fields on thermodynamic properties. Abstract from AMPERE - 15th International Conference on Microwave and High Frequency Heating, Krakow, United Kingdom.
Cardona, Javier ; Lue, Leo. / Effect of external electric fields on thermodynamic properties. Abstract from AMPERE - 15th International Conference on Microwave and High Frequency Heating, Krakow, United Kingdom.1 p.
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abstract = "The efficient use of energy is one the biggest challenges our society faces at the moment and is one of the basic principles of modern chemical engineering. In the case of dielectric materials, microwave heating is known to be a faster and more selective way to transfer energy from a source to a recipient than conventional conduction-based heating. This is due to the volumetric and targeted character of microwave heating, meaning that all the material is heated simultaneously and only substances which respond to the microwave field will be affected. In contrast, conductive heating requires longer times for the energy to be transferred from the surface to the centre of the material.Microwave technology has seen a significant growth in the last decades with applications such as food processing, pre-heating of rubber and plastics, and drying of different materials. More recently microwave heating has also been applied in organic synthesis, heterogeneous catalytic reactions, polymerization reactions and various separation processes [1]. In all these cases, important improvements have been reported with respect to conventional technologies. However, the physical mechanisms by which this enhancement occurs remain somehow unclear.In this work, we propose the implementation of a multiscale modelling approach to develop a better understanding of the thermodynamics of systems under the influence of external electric fields. Modified equations of state are used to model the behaviour of such systems, and reproduce previously obtained experimental results. In addition, molecular simulations provide a deeper insight into the dielectric polarization mechanism, and are employed to study the influence of external electric fields on thermodynamic properties, with particular interest in free energies and chemical equilibrium. We start with the application of a static electric field on both one component systems and mixtures, with the goal of extending the analysis to alternating fields at microwave frequencies. In combination with previous work on dielectric spectroscopy of these materials, this study can provide a valuable tool for modelling dielectric heating processes.",
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author = "Javier Cardona and Leo Lue",
year = "2015",
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note = "AMPERE - 15th International Conference on Microwave and High Frequency Heating ; Conference date: 14-09-2015 Through 17-09-2015",

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Cardona, J & Lue, L 2015, 'Effect of external electric fields on thermodynamic properties' AMPERE - 15th International Conference on Microwave and High Frequency Heating, Krakow, United Kingdom, 14/09/15 - 17/09/15, .

Effect of external electric fields on thermodynamic properties. / Cardona, Javier; Lue, Leo.

2015. Abstract from AMPERE - 15th International Conference on Microwave and High Frequency Heating, Krakow, United Kingdom.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - Effect of external electric fields on thermodynamic properties

AU - Cardona, Javier

AU - Lue, Leo

PY - 2015/9/14

Y1 - 2015/9/14

N2 - The efficient use of energy is one the biggest challenges our society faces at the moment and is one of the basic principles of modern chemical engineering. In the case of dielectric materials, microwave heating is known to be a faster and more selective way to transfer energy from a source to a recipient than conventional conduction-based heating. This is due to the volumetric and targeted character of microwave heating, meaning that all the material is heated simultaneously and only substances which respond to the microwave field will be affected. In contrast, conductive heating requires longer times for the energy to be transferred from the surface to the centre of the material.Microwave technology has seen a significant growth in the last decades with applications such as food processing, pre-heating of rubber and plastics, and drying of different materials. More recently microwave heating has also been applied in organic synthesis, heterogeneous catalytic reactions, polymerization reactions and various separation processes [1]. In all these cases, important improvements have been reported with respect to conventional technologies. However, the physical mechanisms by which this enhancement occurs remain somehow unclear.In this work, we propose the implementation of a multiscale modelling approach to develop a better understanding of the thermodynamics of systems under the influence of external electric fields. Modified equations of state are used to model the behaviour of such systems, and reproduce previously obtained experimental results. In addition, molecular simulations provide a deeper insight into the dielectric polarization mechanism, and are employed to study the influence of external electric fields on thermodynamic properties, with particular interest in free energies and chemical equilibrium. We start with the application of a static electric field on both one component systems and mixtures, with the goal of extending the analysis to alternating fields at microwave frequencies. In combination with previous work on dielectric spectroscopy of these materials, this study can provide a valuable tool for modelling dielectric heating processes.

AB - The efficient use of energy is one the biggest challenges our society faces at the moment and is one of the basic principles of modern chemical engineering. In the case of dielectric materials, microwave heating is known to be a faster and more selective way to transfer energy from a source to a recipient than conventional conduction-based heating. This is due to the volumetric and targeted character of microwave heating, meaning that all the material is heated simultaneously and only substances which respond to the microwave field will be affected. In contrast, conductive heating requires longer times for the energy to be transferred from the surface to the centre of the material.Microwave technology has seen a significant growth in the last decades with applications such as food processing, pre-heating of rubber and plastics, and drying of different materials. More recently microwave heating has also been applied in organic synthesis, heterogeneous catalytic reactions, polymerization reactions and various separation processes [1]. In all these cases, important improvements have been reported with respect to conventional technologies. However, the physical mechanisms by which this enhancement occurs remain somehow unclear.In this work, we propose the implementation of a multiscale modelling approach to develop a better understanding of the thermodynamics of systems under the influence of external electric fields. Modified equations of state are used to model the behaviour of such systems, and reproduce previously obtained experimental results. In addition, molecular simulations provide a deeper insight into the dielectric polarization mechanism, and are employed to study the influence of external electric fields on thermodynamic properties, with particular interest in free energies and chemical equilibrium. We start with the application of a static electric field on both one component systems and mixtures, with the goal of extending the analysis to alternating fields at microwave frequencies. In combination with previous work on dielectric spectroscopy of these materials, this study can provide a valuable tool for modelling dielectric heating processes.

KW - microwave heating

KW - molecular dynamics

KW - thermodynamics

UR - http://ampere.pk.edu.pl/

M3 - Abstract

ER -

Cardona J, Lue L. Effect of external electric fields on thermodynamic properties. 2015. Abstract from AMPERE - 15th International Conference on Microwave and High Frequency Heating, Krakow, United Kingdom.