Infrared thermography of sorptive heating of thin porous media: experiments and continuum simulations

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Abstract

We have studied the imbibition of water from a stationary nozzle into thin, moving porous media that are suspended in air, as well as the accompanying evaporation and condensation processes. Due to sorptive heating and the latent heat associated with the phase change processes, the temperature of the porous medium becomes non-uniform. We have measured the temperature distributions using infrared thermography as a function of substrate speed. Moreover, we developed a numerical model coupling Darcy flow and heat transfer in the thin porous medium with gas flow, heat and water vapor transport in the surrounding gas phase. The numerical simulations reproduce the measurements very well and point at an intricate buoyancy-induced gas-phase convection pattern.

LanguageEnglish
Article number118875
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume147
DOIs
StatePublished - 31 Oct 2019

Fingerprint

Porous materials
continuums
Heating
heating
Gases
vapors
vapor phases
simulation
Experiments
Latent heat
Steam
latent heat
Buoyancy
buoyancy
Water vapor
nozzles
gas flow
Flow of gases
water vapor
Numerical models

Keywords

  • Heat of wetting
  • Infrared thermography
  • Moisture distributions
  • Porous media
  • Sorption

Cite this

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title = "Infrared thermography of sorptive heating of thin porous media: experiments and continuum simulations",
abstract = "We have studied the imbibition of water from a stationary nozzle into thin, moving porous media that are suspended in air, as well as the accompanying evaporation and condensation processes. Due to sorptive heating and the latent heat associated with the phase change processes, the temperature of the porous medium becomes non-uniform. We have measured the temperature distributions using infrared thermography as a function of substrate speed. Moreover, we developed a numerical model coupling Darcy flow and heat transfer in the thin porous medium with gas flow, heat and water vapor transport in the surrounding gas phase. The numerical simulations reproduce the measurements very well and point at an intricate buoyancy-induced gas-phase convection pattern.",
keywords = "Heat of wetting, Infrared thermography, Moisture distributions, Porous media, Sorption",
author = "Vignesh Murali and Jos Zeegers and Anton Darhuber",
year = "2019",
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language = "English",
volume = "147",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
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T2 - International Journal of Heat and Mass Transfer

AU - Murali,Vignesh

AU - Zeegers,Jos

AU - Darhuber,Anton

PY - 2019/10/31

Y1 - 2019/10/31

N2 - We have studied the imbibition of water from a stationary nozzle into thin, moving porous media that are suspended in air, as well as the accompanying evaporation and condensation processes. Due to sorptive heating and the latent heat associated with the phase change processes, the temperature of the porous medium becomes non-uniform. We have measured the temperature distributions using infrared thermography as a function of substrate speed. Moreover, we developed a numerical model coupling Darcy flow and heat transfer in the thin porous medium with gas flow, heat and water vapor transport in the surrounding gas phase. The numerical simulations reproduce the measurements very well and point at an intricate buoyancy-induced gas-phase convection pattern.

AB - We have studied the imbibition of water from a stationary nozzle into thin, moving porous media that are suspended in air, as well as the accompanying evaporation and condensation processes. Due to sorptive heating and the latent heat associated with the phase change processes, the temperature of the porous medium becomes non-uniform. We have measured the temperature distributions using infrared thermography as a function of substrate speed. Moreover, we developed a numerical model coupling Darcy flow and heat transfer in the thin porous medium with gas flow, heat and water vapor transport in the surrounding gas phase. The numerical simulations reproduce the measurements very well and point at an intricate buoyancy-induced gas-phase convection pattern.

KW - Heat of wetting

KW - Infrared thermography

KW - Moisture distributions

KW - Porous media

KW - Sorption

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VL - 147

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

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