Dynamics of interphase surface of self-sustaining evaporation front in liquid with additives of nanosized particles

Жуков, В. Е.; Павленко, А. Н.; Moiseev, M. I.; Кузнецов, Д. В.

doi:10.1134/s0018151x17010242

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…The obtained experimental results are important for fundamental research in the field of non-contact temperature measurements of droplets of solutions, emulsions and suspensions under radiation, and convective and conductive heating. In particular, it is emphasized in [14][15][16][17][18][19][20][21][22][23] that reliable experimental information on essentially non-stationary and non-uniform temperature fields of evaporating droplets is not sufficient. The lack of a reliable experimental database on such temperature fields still hinders the development of models of heating and evaporation of fuel droplets.…”

Section: Resultsmentioning

confidence: 99%

Explosive disintegration of two-component droplets in a gas flow at its turbulization

Bellettre

Стрижак

2019

Therm sci

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The experimental results shown that the mode of droplet disintegration dominates in the laminar flow, and the intensive fragmentation is prevalent in the turbulent flow during almost the entire time of heating. Typical dependences of the time of droplet heatup before disintegration or fragmentation on the temperature, flow rate, structure and regime (laminar and turbulent) are established. The studies are conducted with heated air and flue gases to ensure the application of the research results in the technology of thermal and flame cleaning of liquids from irregular impurities. It is shown that in the flow of combustion products the droplet disintegration occurs 15-20% faster than in the air-flow. In this case, the explosive puffing is more often realized. At high-temperatures (more than 400?C) the characteristics of the explosive droplet disintegration in the studied flows are almost identical (differences in disintegration times do not exceed 5% at different flow turbulization). At lower temperatures, the disintegration times differ 3-4 times for the range Re = 2200-3400. In this case, the more Reynolds number is, the more intense is the fragmentation of two-component droplets throughout the heating time. Due to explosive disintegration of intensely evaporating two-component droplets the growth of the relative area of evaporation was 10-25 times.

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Section: Resultsmentioning

confidence: 99%

Explosive disintegration of two-component droplets in a gas flow at its turbulization

Bellettre

Стрижак

2019

Therm sci

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“…It is of interest to study how this factor affects the heating and disintegration of typical two-component droplets using a large group of popular materials. A solution to this problem is of principal importance for the development of high-potential gas-vapor-droplet technologies considered in [18][19][20][21][22][23][24][25][26][27]. Vershinina et al [10] established the impact of the holder material on the ignition of fuel slurry droplets.…”

Section: Motivationmentioning

confidence: 99%

Impact of Holder Materials on the Heating and Explosive Breakup of Two-Component Droplets

et al. 2018

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The heating of two-component droplets and the following explosive breakup of those droplets have been extensively studied over the most recent years. These processes are of high interest, since they can significantly improve the performance of many technologies in fuel ignition, thermal and flame liquid treatment, heat carriers based on flue gases, vapors and water droplets, etc. Research throughout the world involves various schemes of droplet heating and supply (or, less frequently, injection) to heating chambers. The most popular scheme features the introduction of a two-component or multi-component droplet onto a holder into the heating chamber. In this research, we study how holder materials affect the conditions and integral characteristics of droplet heating and explosive breakup: heating time until boiling temperature; minimum temperature sufficient for droplet breakup; number and size of fragments in the resulting droplet aerosol, etc. Experiments involve droplets that are produced from flammable (oil) and non-flammable (water) components with significantly different thermophysical and optical properties, as well as boiling temperature and heat of vaporization. The most popular elements with the scientific community, such as ceramic, steel, aluminum, copper, and phosphorus rods, as well as a nichrome wire, serve as holders. We establish the roles of energy inflow from a holder to a droplet, and energy outflow in the opposite direction. We compare the holder results with a supporting thermocouple, recording the drop temperature under a heat transfer provided at 350°C. Finally, we forecast the conditions that are required for a significant improvement in the performance of thermal and flame water treatment through the explosive breakup of two-component droplets.

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“…But none of these models can describe front behaviour within a wide range of experimental parameters. Main flaw of most of the models is that they don't take into account the microstructure of the front, namely small-scaled hydrodynamic instability, which greatly influences heat transfer through the interface [3][4][5]. The lack of experimental data on evaporation front structure at various conditions also hinders its strict and complete mathematical description.…”

Section: Introductionmentioning

confidence: 99%

Study on dynamics and structure of evaporation front in ethanol depending on pressure and subcooling

Moiseev

Жуков

2017

MATEC Web Conf.

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Abstract. This paper is dedicated to study of self-sustained evaporation front in subcooled ethanol at stepwise heat generation. The data on evaporation front velocity and microstructure at different subcoolings and pressure are presented. Experiments show that development of the evaporation front drastically depends on studied parameters. At low pressures initial vapour bubbles grow without losing interface stability and initiation of evaporation fronts doesn't occur. At higher pressures the fronts propagate along the heater, and its structure depends on temperature.

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Dynamics of interphase surface of self-sustaining evaporation front in liquid with additives of nanosized particles

Cited by 16 publications

References 19 publications

Explosive disintegration of two-component droplets in a gas flow at its turbulization

Explosive disintegration of two-component droplets in a gas flow at its turbulization

Impact of Holder Materials on the Heating and Explosive Breakup of Two-Component Droplets

Study on dynamics and structure of evaporation front in ethanol depending on pressure and subcooling

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