Micro-explosion and puffing of a group of two-component droplets

Antonov, Dmitri; Fedorenko, R.M.; Стрижак, П. А.

doi:10.1016/j.applthermaleng.2020.116023

Cited by 17 publications

(2 citation statements)

References 40 publications

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“…The main effects for a single droplet were taken into account in the development of the model presented in this paper. The group effects of the mutual influence of neighboring droplets on each other play an important role when the distances between them are less than 5-7 initial diameters [70][71][72][73]. Moreover, this mutual influence is enhanced with an increase in the heat fluxes to the surface of droplets, their mutual arrangement with vapor leakage from the surface of one droplet to neighboring ones, transformation of the surfaces of droplets and change in their shape (oblate or elongated ellipsoids), their swirling, as well as increased thermal diffusivity, reduced viscosity and surface tension of liquids.…”

Section: Materials Physical Propertiesmentioning

confidence: 99%

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Antonov,

Islamova,

Orlova

2023

Energies

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The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface were used in comparison with the results on a polished surface. Microscopic studies were conducted to identify the features of the formed coatings. The wetting properties were characterized by means of the static contact angle and the contact angle hysteresis: on polished surface No. 1 (contact angle—73°, hysteresis—11°), on structured surface No. 2 (contact angle—125°, hysteresis—9°), and on structured surface No 3 (contact angle—155°, hysteresis—7°). The experimental dependences of the droplet evaporation rate on the different surfaces under normal conditions (ambient air temperature—293 K, atmospheric pressure, humidity—35%) were obtained. The evaporation regimes of droplets on the surfaces under study were identified. Water droplets evaporated in the pinning mode on surfaces No. 1 and No. 2. When a water droplet evaporated on surface No 3, the droplet was in the constant contact angle regime for ≈90% of its lifetime. Based on the experimental data obtained, a two-dimensional model of conjugate heat and mass transfer was developed, which describes the heating and evaporation of a liquid droplet on structured hydrophobic and hydrophilic surfaces at a wide range of contact angles. Satisfactory agreement was obtained between the numerical simulation results and experimental data. Using the model, the fields of temperature, concentration and other key characteristics were established at different points in time. Recommendations for its application in the development of gas–vapor–droplet applications were formulated.

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Section: Materials Physical Propertiesmentioning

confidence: 99%

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Antonov,

Islamova,

Orlova

2023

Energies

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“…The data on the secondary droplets that could be captured by the image showed that the surface area of the liquid was increased by more than 10 times. The secondary droplets would interact with the adjacent original droplets and secondary droplets to form chain breaks, 33 and the secondary droplets were ignited almost immediately after they were generated.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Disruptive Evaporation and the Motion Characteristics of Secondary Droplets for Emulsified Biodiesel with a Suspended Droplet Configuration

Zhu

Zhong

et al. 2021

ACS Omega

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The secondary atomization of droplets is one of the means to improve the efficiency of diesel fuel injection atomization. As a promising biomass fuel, emulsified biodiesel showed a good prospect in improving the atomization effect of diesel engines. In this study, a high-temperature and pressure-resistant evaporator was designed to simulate diesel-like conditions, and the evaporation and combustion experiments of emulsified biodiesel droplets were carried out. The morphological changes in the droplets were dynamically captured using a high-speed camera. According to the collected images, the evaporation characteristic parameters, the dynamic parameters of droplet motion, and the correlation between the original and secondary droplets were quantitatively analyzed. The gain effect of secondary atomization for droplets on the diesel engine spray was evaluated. The results showed that the emulsified biodiesel underwent nucleation, agglomeration, puffing, and explosion during the evaporation process, while the classic d 2 law only meets a few cases of this fuel. The effect of high temperature was reflected in reducing the normalization time of droplet agglomeration and explosion, while the higher pressure inhibited the expansion of the droplets, thus slowing down the expansion rate and restricting the droplet volume. Driven by the water content, the time of droplet explosion was closer to the droplet lifetime. The evaporation process of the secondary droplet was similar to that of the original droplet over a reduced scale of 1−2 orders of magnitude. (D d / D d 0 ) 2 ≈ 1 was a necessary condition for the secondary droplets to be produced in large quantities. The average equivalent diameter of the droplets was distributed in the range of 80−140 μm, and the secondary atomization caused expansion of the spray range by 20− 40%. Expansion of the range of secondary droplets was beneficial to shortening the ignition delay and increasing the combustion rate.

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Ratio of water/fuel concentration in a group of composite droplets on high-temperature heating

Antonov¹,

Кузнецов²,

Fedorenko³

et al. 2022

Applied Thermal Engineering

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Micro-explosion and puffing of a group of two-component droplets

Cited by 17 publications

References 40 publications

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Experimental Research on the Disruptive Evaporation and the Motion Characteristics of Secondary Droplets for Emulsified Biodiesel with a Suspended Droplet Configuration

Ratio of water/fuel concentration in a group of composite droplets on high-temperature heating

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