Interaction of Impacting Water Drop With a Heated Surface and Breakup Into Microdrops

Gatapova, Elizaveta Ya.; Kirichenko, Ekaterina O.; Bai, Bofeng; Kabov, Oleg

doi:10.1615/interfacphenomheattransfer.2018026089

“…Many high-temperature applications listed above NOMENCLATURE R d initial radius of two-component liquid droplet (mm) t time (s) T temperature ( • C) T a airflow temperature ( • C) T d temperature of the water at the inner interface in a suspension droplet ( • C) T s temperature of the free surface of a suspension droplet ( • C) T c temperature at the center of the water film (at the bottom of a suspension droplet) enveloping a solid inclusion or water temperature inside of the two-component liquid droplet ( • C) T b temperature at the water-flammable liquid interface ( • C) U a air velocity (m/s) V d water volume (µl) V inc inclusion volume (mm 3 ) y length of the droplet section (mm) δ liquid film thickness around the solid particle (mm) γ volume concentration of the flammable liquids in the two-component droplets (vol. %) cannot obtain a sustainable development due to a limited experimental database (Gatapova et al, 2018;Zaitsev et al, 2018b). It is necessary to apply adequate registration methods for the main parameters characterizing the hightemperature processes of such complex liquids.…”

Section: Introductionmentioning

confidence: 99%

Using Planar Laser-Induced Fluorescence to Study the Phase Transformations of Two-Component Liquid and Suspension Droplets

Волков

¹

,

Кузнецов

²

2018

Interfac Phenom Heat Transfer

1

0

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Using the planar laser-induced fluorescence (PLIF), we performed experiments to determine evaporation dynamics of homogeneous and heterogeneous droplets of liquids, conditions of their boiling, and explosive breakup. For the 1-2 mm water droplets, the distribution of highly non-homogeneous and non-steady temperature field was detected by highspeed cross-correlation video recording and the Tema Automotive software. We identified highly nonlinear dependences of evaporation rate on heating temperature and time as well as water droplet size. For the two-component liquids and water-based suspensions of graphite, we revealed unsteady temperature fields and established mechanisms and regimes of the explosive breakup of the heterogeneous droplets when heated. The regimes differ in the number and dimensions of the emerging gas-liquid fragments as well as the durations of the main stages. The three regimes of warming-up and evaporation of the heterogeneous droplets have been obtained. The explosive breakup of droplets enables provision for the secondary atomization of the liquid with the emergence of an aerosol cloud. The surface area of the liquid increases several-fold. The temperature variations at the water/solid or water/flammable component interfaces were determined corresponding to each boiling and breakup regime. Using the PLIF, we studied reasons and mechanism of the explosive breakup of water droplets with single large carbonaceous inclusions when heated.

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“…The rapid evaporation and boiling of two-component liquids, emulsions, and solutions are of interest, since a group of components vaporizes simultaneously (Sazhin, 2017). Many high-temperature applications listed above cannot obtain a sustainable development due to a limited experimental database (Gatapova et al, 2018;Zaitsev et al, 2018b). It is necessary to apply adequate registration methods for the main parameters characterizing the hightemperature processes of such complex liquids.…”

Section: Introductionmentioning

confidence: 99%

Using Planar Laser-Induced Fluorescence to Study the Phase Transformations of Two-Component Liquid and Suspension Droplets

Волков

¹

2018

International Heat Transfer Conference 16

0

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Using the planar laser-induced fluorescence (PLIF), we performed experiments to determine evaporation dynamics of homogeneous and heterogeneous droplets of liquids, conditions of their boiling, and explosive breakup. For the 1-2 mm water droplets, the distribution of highly non-homogeneous and non-steady temperature field was detected by highspeed cross-correlation video recording and the Tema Automotive software. We identified highly nonlinear dependences of evaporation rate on heating temperature and time as well as water droplet size. For the two-component liquids and water-based suspensions of graphite, we revealed unsteady temperature fields and established mechanisms and regimes of the explosive breakup of the heterogeneous droplets when heated. The regimes differ in the number and dimensions of the emerging gas-liquid fragments as well as the durations of the main stages. The three regimes of warming-up and evaporation of the heterogeneous droplets have been obtained. The explosive breakup of droplets enables provision for the secondary atomization of the liquid with the emergence of an aerosol cloud. The surface area of the liquid increases several-fold. The temperature variations at the water/solid or water/flammable component interfaces were determined corresponding to each boiling and breakup regime. Using the PLIF, we studied reasons and mechanism of the explosive breakup of water droplets with single large carbonaceous inclusions when heated.

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