Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis

E. Teodori, Marco Marengo, A.S. Moita, Anastasios Georgoulas, Pedro Pontes, A.L.N. Moreira

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This study presents the numerical reproduction of the entire surface temperature field resulting from a water droplet spreading on a heated surface, which is compared with experimental data. High-speed infrared thermography of the back side of the surface and high-speed images of the side view of the impinging droplet were used to infer on the solid surface temperature field and on droplet dynamics. Numerical reproduction of the phenomena was performed using OpenFOAM CFD toolbox. An enhanced volume of fluid (VOF) model was further modified for this purpose. The proposed modifications include the coupling of temperature fields between the fluid and the solid regions, to account for transient heat conduction within the solid. The results evidence an extremely good agreement between the temporal evolution of the measured and simulated spreading factors of the considered droplet impacts. The numerical and experimental dimensionless surface temperature profiles within the solid surface and along the droplet radius, were also in good agreement. Most of the differences were within the experimental measurements uncertainty. The numerical results allowed relating the solid surface temperature profiles with the fluid flow. During spreading, liquid recirculation within the rim, leads to the appearance of different regions of heat transfer that can be correlated with the vorticity field within the droplet.
Original languageEnglish
JournalEnergies
Volume10
Issue number6
DOIs
Publication statusPublished - 9 Jun 2017

Fingerprint

surface temperature
numerical analysis
heat transfer
solid surfaces
cooling
temperature distribution
temperature profiles
high speed
fluids
charge flow devices
rims
conductive heat transfer
vorticity
fluid flow
radii
liquids
water

Bibliographical note

© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Keywords

  • droplet impact
  • volume of fluid (VOF) method
  • IR thermography
  • conjugate heat transfer
  • vorticity

Cite this

Teodori, E. ; Marengo, Marco ; Moita, A.S. ; Georgoulas, Anastasios ; Pontes, Pedro ; Moreira, A.L.N. / Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis. In: Energies. 2017 ; Vol. 10, No. 6.
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abstract = "This study presents the numerical reproduction of the entire surface temperature field resulting from a water droplet spreading on a heated surface, which is compared with experimental data. High-speed infrared thermography of the back side of the surface and high-speed images of the side view of the impinging droplet were used to infer on the solid surface temperature field and on droplet dynamics. Numerical reproduction of the phenomena was performed using OpenFOAM CFD toolbox. An enhanced volume of fluid (VOF) model was further modified for this purpose. The proposed modifications include the coupling of temperature fields between the fluid and the solid regions, to account for transient heat conduction within the solid. The results evidence an extremely good agreement between the temporal evolution of the measured and simulated spreading factors of the considered droplet impacts. The numerical and experimental dimensionless surface temperature profiles within the solid surface and along the droplet radius, were also in good agreement. Most of the differences were within the experimental measurements uncertainty. The numerical results allowed relating the solid surface temperature profiles with the fluid flow. During spreading, liquid recirculation within the rim, leads to the appearance of different regions of heat transfer that can be correlated with the vorticity field within the droplet.",
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Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis. / Teodori, E.; Marengo, Marco; Moita, A.S.; Georgoulas, Anastasios; Pontes, Pedro; Moreira, A.L.N.

In: Energies, Vol. 10, No. 6, 09.06.2017.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Marengo, Marco

AU - Moita, A.S.

AU - Georgoulas, Anastasios

AU - Pontes, Pedro

AU - Moreira, A.L.N.

N1 - © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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N2 - This study presents the numerical reproduction of the entire surface temperature field resulting from a water droplet spreading on a heated surface, which is compared with experimental data. High-speed infrared thermography of the back side of the surface and high-speed images of the side view of the impinging droplet were used to infer on the solid surface temperature field and on droplet dynamics. Numerical reproduction of the phenomena was performed using OpenFOAM CFD toolbox. An enhanced volume of fluid (VOF) model was further modified for this purpose. The proposed modifications include the coupling of temperature fields between the fluid and the solid regions, to account for transient heat conduction within the solid. The results evidence an extremely good agreement between the temporal evolution of the measured and simulated spreading factors of the considered droplet impacts. The numerical and experimental dimensionless surface temperature profiles within the solid surface and along the droplet radius, were also in good agreement. Most of the differences were within the experimental measurements uncertainty. The numerical results allowed relating the solid surface temperature profiles with the fluid flow. During spreading, liquid recirculation within the rim, leads to the appearance of different regions of heat transfer that can be correlated with the vorticity field within the droplet.

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