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Conference Papers Year : 2014

Digital in-line holography and "inverse problems" approach for Lagrangian measurements of droplets evaporation

Abstract

Digital in-line holography is used to perform a Lagrangian tracking of Diethyl Ether droplets vaporizing in air, in a quasi free falling configuration. Hologram reconstruction is based on an 'inverse problems' approach together with a weighted mask method to account for the modification of the droplet holograms by evaporation and resulting refractive index gradients in the surrounding air/vapor mixture. Vaporizing droplets are tracked and their diameter measured until the end of evaporation. Measured diameters then reach a plateau with remaining droplets only composed of water, originating from the condensation of humid air at the droplet surface. This fact is supported by droplets' refractive index estimations deduced from scattered light measurements at rainbow angle and by comparing experimental results to those of a simple evaporation/condensation model.
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Dates and versions

hal-02397922 , version 1 (11-12-2019)

Identifiers

  • HAL Id : hal-02397922 , version 1

Cite

Loic Mees, N. Grosjean, Jean-Louis Marié, M. Seifi, Clarisse Fournier. Digital in-line holography and "inverse problems" approach for Lagrangian measurements of droplets evaporation. 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Jul 2014, Lisbonne, Portugal. ⟨hal-02397922⟩
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