Heat flux reconstruction by inversion of experimental infrared temperature measurements – Application to the impact of a droplet in the film boiling regime
| Autor: | Jean-François Pierson, Guillaume Castanet, Ophélie Caballina, William Chaze, Fabrice Lemoine, Denis Maillet |
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| Přispěvatelé: | Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Division of Combustion Physics, Lund Institute of Technology, Lund University [Lund]-Lund University [Lund], Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal conduction 01 natural sciences Temperature measurement Leidenfrost effect [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] 010305 fluids & plasmas Drop impact Physics::Fluid Dynamics Boiling point Heat flux 0103 physical sciences Heat transfer Thermal [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] Composite material 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | International Journal of Heat and Mass Transfer International Journal of Heat and Mass Transfer, Elsevier, 2019, 128, pp.469-478. ⟨10.1016/j.ijheatmasstransfer.2018.08.069⟩ |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2018.08.069 |
| Popis: | An Inverse Heat Conduction Problem (IHCP) is considered in order to estimate the transient heat flux extracted from a hot solid surface by an impinging droplet. The resolution of the IHCP is made with the so-called quadrupole method, which provides an analytical expression of the temperature and the heat flux at the front surface of the solid wall, where the drop impact takes place. In the experiments, the thermal response of the front surface is recorded using IR thermography. For that, sapphire is chosen as the material of the solid wall, and the front surface is coated with a thin TiAlN ceramic layer (thickness of 300 nm). The latter is highly emissive and opaque in the IR while sapphire is transparent at the same wavelengths. This feature allows the surface impacted by the droplet to be viewed from the bottom by the IR camera. This approach has been implemented to gain some insights into the heat transfer from the solid surface as well as the formation and growth of the vapor film, which appears under the droplet in the regime of film boiling, when the solid temperature is much higher than the boiling temperature of the liquid. Due to the small thickness of the vapor film, heat conduction is predominant in the vapor layer. Hence, the thickness of the vapor film can be deduced from the value of the reconstructed local heat flux, assuming a linear profile of temperature between the liquid interface of the droplet at the saturation temperature and the solid surface measured by IR thermometry. |
| Databáze: | OpenAIRE |
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