Experimental understanding on the dynamics of micro-explosion and puffing in ternary emulsion droplets

Avulapati, Madan Mohan; Megaritis, Thanos; Xia, Jun; Ganippa, Lionel

doi:10.1016/j.fuel.2018.11.112

Cited by 102 publications

(19 citation statements)

References 25 publications

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“…It was also experimentally established that micro-explosion occurs with emulsions, micro-, and nano-emulsions [4][5][6][7][8], as well as with a heated immiscible two-component droplet (i.e., with one pronounced inter-component interface) [9][10][11]. The use of technologies based on droplet microexplosions affects the economic, environmental, energetic, rheological, and other parameters of the corresponding processing chambers and the processes occurring therein [12][13][14][15][16]. The spraying and secondary atomization of fuel droplets in combustion chambers can be considered the main application [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The research findings on those characteristics are given in Refs. [5,10,15,16]. The authors of Refs.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of Refs. [10,15,16] determined the size distributions of child droplets. Tarlet et al [5] experimentally determined the thermal energy of child droplets.…”

Section: Introductionmentioning

confidence: 99%

“…There is also a limited number of research findings (e.g., [5,10,15,16]) on the integral characteristics of child droplets, because the processes under study are fast-paced and their recording requires complex and expensive recording systems [1,8,9,14,[19][20][21][22][23][24][25][26][27][28], as well as dedicated data processing algorithms. For instance, the key methods for recording the characteristics of child droplets are as follows: Particle Tracking Velocimetry (PTV) [19,20] for the velocities and trajectories of child droplets; Schlieren Photography (SP) [21,22] for their number and size; Laser Induced Phosphorescence (LIP) [23][24][25], Planar Laser Induced Fluorescence (PLIF) [9,26,27], and 2-Color Laser Induced Fluorescence (2-Color LIF) [1,8,14,28] for their temperature.…”

Section: Introductionmentioning

confidence: 99%

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Child droplets from micro-explosion of emulsion and immiscible two-component droplets

Стрижак

Волков

Moussa

et al. 2021

International Journal of Heat and Mass Transfer

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Here we present the experimental findings of the research into the integral characteristics of secondary droplets produced from the micro-explosive fragmentation of two types of initial droplets. Both types are based on water and tetradecane: an emulsion droplet and a two-component immiscible droplet with water as the core and tetradecane as the envelope. We study the threshold (critical) conditions for the microexplosion of droplets on a substrate heated up to 550 °C. In the course of experiments, we recorded the number, sizes, velocities, temperatures, and component composition of child droplets. It is shown that the parameters of child droplets differ significantly in the case of two-component droplets and emulsion droplets. The decisive impact comes from the heating temperature. Using a combination of Schlieren Photography, Particle Tracking Velocimetry, and 2-Color Laser Induced Fluorescence, we have determined the proportions of the concentration and size of secondary water droplets and combustible component droplets in the emerging aerosol cloud. We have also calculated the kinetic energies of child droplets. When generalizing the experimental findings, we established the conditions for the generation of a high-temperature fine mist aerosol through the micro-explosive breakup of two-component droplets and recorded the typical trajectories of secondary fragments. We show that such conditions are possible for both emulsion droplets and immiscible two-component droplets with a pronounced interface. It is established that much more secondary fragments of water are produced in the second case. This result shows that water separates from the combustible component more intensely in the second case, and the micro-explosion systems relying on water and combustible liquid droplets mixing in the combustion chamber bear more promise.

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Section: Introductionmentioning

confidence: 99%

“…The research findings on those characteristics are given in Refs. [5,10,15,16]. The authors of Refs.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of Refs. [10,15,16] determined the size distributions of child droplets. Tarlet et al [5] experimentally determined the thermal energy of child droplets.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Child droplets from micro-explosion of emulsion and immiscible two-component droplets

Стрижак

Волков

Moussa

et al. 2021

International Journal of Heat and Mass Transfer

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“…Puffing is initiated when water vapor has accumulated to a certain level inside droplets. Puffing enhances droplet atomization and evaporation, and reduces emissions [5,6]. Moreover, the heat consumed to evaporate water reduces the flame temperature and suppresses the generation of thermal NOx.…”

Section: Introductionmentioning

confidence: 99%

The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion

et al. 2019

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Diesel fuel exhibits excellent combustion characteristics and stability. However, diesel use is becoming restricted because of its associated environmental problems. Fuel emulsification, which increases efficiency and reduces pollution, became the solution of environmental problem. In this study, five water:diesel emulsions with mass ratios (0.3, 0.6, 1.0, 1.2, and 1.5) via ultrasonication were synthesized with and without surfactant. The optimal water:diesel ratio (=1:1) of an emulsion containing the surfactant was found by analyzing fuel concentration, mixing time, and viscosity. The combustion characteristics of single-droplet optimal emulsions were studied through ignition delay, burning rate, and total droplet lifetime at high temperature (400–700 °C) and pressure (1–15 bar), and micro-explosion phenomenon was observed. Although the ignition delay of emulsion increased, the total lifetime of the emulsion droplet was lower than that of diesel under 5 bar, 600 °C condition.

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Diesel Engines

Kegl¹,

Kralj²,

Kegl³

et al. 2020

Nanomaterials for Environmental Application

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Experimental understanding on the dynamics of micro-explosion and puffing in ternary emulsion droplets

Cited by 102 publications

References 25 publications

Child droplets from micro-explosion of emulsion and immiscible two-component droplets

Child droplets from micro-explosion of emulsion and immiscible two-component droplets

The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion

Diesel Engines

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