Dispersed phase structure and micro-explosion behavior under different schemes of water-fuel droplets heating

Bellettre, Jérôme; Стрижак, П. А.; Tarlet, Dominique

doi:10.1016/j.fuel.2019.116241

Cited by 36 publications

(10 citation statements)

References 22 publications

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“…The analysis of the phase separation process and the formation of a composite state of water in fuel is beyond the scope of the paper. These processes are discussed in many papers, including [15,16].…”

Section: Introductionmentioning

confidence: 99%

A new approach to modelling micro-explosions in composite droplets

Sazhin

Bar-Kohany

Nissar

et al. 2020

International Journal of Heat and Mass Transfer

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A new approach to modelling puffing and micro-explosion in composite water/fuel droplets is proposed. This approach is based on the assumption previously made that a spherical water sub-droplet is located in the centre of a spherical fuel (n-dodecane) droplet. The heating of a fuel droplet is described by the heat conduction equation with the Robin boundary condition at its surface and continuity conditions at the fuel-water interface. The analytical solution to this equation, obtained at each time step, is incorporated into the numerical code and used for the analysis of droplet heating and evaporation. The effects of droplet thermal swelling are taken into account. The results of calculations using this code allowed us to obtain the time evolution of the temperature at the water/fuel interface and the evolution of time derivative of this temperature (Ṫ ) with time in the same location. Using the original and previously published experimental data, two new correlations for the nucleation temperatures T N as functions ofṪ , valid in the range 0 ≤Ṫ ≤ 10 6 K/s, are suggested. Using these correlations and the values ofṪ inferred from

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Section: Introductionmentioning

confidence: 99%

A new approach to modelling micro-explosions in composite droplets

Sazhin

Bar-Kohany

Nissar

et al. 2020

International Journal of Heat and Mass Transfer

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“…Moreover, the temperature within a droplet may be highly dependent on the heating scheme [32][33][34][35][36][37][38][39][40][41]. That is why all studies of such kind require specialized equipment and data processing algorithms.…”

Section: Introductionmentioning

confidence: 99%

“…It is also important to select the optimal droplet heating scheme for these conditions. The analysis of various heating schemes [39,40] indicates that conductive heating (using a heated surface) is the optimal scheme for 2-Color LIF as compared to other heat exchange schemes. Radiative heating complicates the optical access to a droplet.…”

Section: Introductionmentioning

confidence: 99%

Measuring temperature of emulsion and immiscible two-component drops until micro-explosion using two-color LIF

Стрижак

Волков

Moussa

et al. 2020

International Journal of Heat and Mass Transfer

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In this research, we measure the temperatures of the non-combustible component (water) in a fuel droplet by 2-Color LIF before its micro-explosive fragmentation. We use two types of droplets based on water and tetradecane: a two-component immiscible droplet with water in the core and tetradecane as the envelope; a pre-mix emulsion. In both cases, the relative volume fraction of water in a droplet is 9%, and that of the combustible component (tetradecane) is 91%. To provide the micro-explosive dispersion of droplets, we use a scheme with the conductive heating in the range of 250 °C to 550 °C. Using the highspeed 2-Color LIF technique, we observe the coalescence of water micro-droplets in emulsion droplets and intense disruption of the water core in a two-component droplet when heated. The temperature difference may range from 1 °C to 10 °C. Temperature distributions in emulsion droplets are more monotone when heated until micro-explosion. In the puffing regime, the droplet temperature is 1-3 °C higher than in the micro-explosion regime at the same temperatures of the heated metal substrate surface.Within a certain interval of the heating time, the temperatures of water in a two-component droplet and in an emulsion droplet become comparable.

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“…Good atomization effect plays an important role in flame spray pyrolysis (FSP), fluid catalytic cracking (FCC) and fuel combustion [1][2][3][4][5] . So, emulsified feedstock technique, which replaces the feedstock with water-in-oil (W/O) emulsions, is developed to try to use explosive boiling of lighter components (water) making the micro-explosion more intense 2,6,7 . Several studies have shown the potential of this emulsified feedstock technique in chemical production.…”

Section: Introductionmentioning

confidence: 99%

Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

Cao

Xiao

Cui³

et al. 2022

Preprint

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The emulsified feedstock technique is to improve the performance of products by using the micro-explosion phenomenon of emulsion. However, an obstacle to some applications of this technology is the contradiction between emulsion stability and micro-explosion intensity. For the first time, adding water-soluble polymers was proposed to solve this problem. Two polymers of xanthan gum (XG) and nonionic polyacrylamide (NPAM) were investigated and the results show that micro-explosions have five forms. As one of these five forms, the intensity of optimal micro-explosion is three orders of magnitude higher than other forms, and adding 0.5% XG increases the probability of optimal micro-explosion from 0% to 60% due to the low surface activity, strong thickening and pseudoplasticity of XG solutions. By contrast, NPAM does not promote micro-explosion because of its strong surface activity. Finally, a new mechanism for micro-explosions related to surface tension, interfacial tension and viscosity is proposed.

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Dispersed phase structure and micro-explosion behavior under different schemes of water-fuel droplets heating

Cited by 36 publications

References 22 publications

A new approach to modelling micro-explosions in composite droplets

A new approach to modelling micro-explosions in composite droplets

Measuring temperature of emulsion and immiscible two-component drops until micro-explosion using two-color LIF

Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

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