Experimental investigation on the characteristic of jet break-up for butanol droplet impacting onto a heated surface in the film boiling regime

Cen, Chunze; Wu, Han; Lee, Chia-fon; Liu, Fushui; Li, Yikai

doi:10.1016/j.ijheatmasstransfer.2018.02.059

Cited by 27 publications

(28 citation statements)

References 33 publications

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“…Figure 5 shows experimentally recorded frames of the hydrodynamic breakup of WiDME and WiBDME drops. Similar interaction types are thoroughly studied in a number of papers, in particular [10,11,16,25], for droplets of fuel and hydrocarbon two-component mixtures, as well as biofuel compositions. In this study, we present the data on the hydrodynamic breakup of micro-emulsion fuel droplets interacting with a heated horizontal wall.…”

Section: Hydrodynamic Interaction Regimes Of Widme and Wibdme Dropletsmentioning

confidence: 99%

“…Moreover, the studied processes become even more complicated because the saturation temperatures of the liquids in emulsions, micro-emulsions, and nano-emulsions may differ drastically. This results in some unique aspects of droplet interaction with the heated wall (even those described in [25,26]) that should be studied in detail for each high-potential two-or multicomponent fuel composition, just like it was done for urea water solution droplets [27]. Therefore, here we aim to study the interaction of multicomponent emulsion droplets with a heated surface with an emphasis on the secondary atomization as the most interesting regime for practical application.…”

Section: Introductionmentioning

confidence: 99%

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Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall

et al. 2020

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Using high-speed video recording, we establish the following regimes of hydrodynamic interaction of a biodiesel micro-emulsion fuel droplet with a heated wall: deposition (including drop spreading and receding), drop hydrodynamic breakup, and rebound. Collision regime maps are plotted using a set of dimensionless criteria: Weber number We = 470–1260, Ohnesorge number Oh = 0.146–0.192, and Reynolds number Re = 25–198. The scenarios of droplet hydrodynamic disintegration are studied for transient and film boiling. We also estimate the disintegration characteristics of a biodiesel micro-emulsion droplet (mean diameter of child droplets, their number, and evaporation surface area increase due to breakup). The study establishes the effect of water proportion on the micro-emulsion composition (8–16 vol.%), heating temperature (300–500 °C), droplet size (1.8–2.8 mm), droplet velocity (3–4 m/s), rheological properties of the examined compositions, and emulsifier concentration (10.45 vol.% and 20 vol.%) on the recorded characteristics. The results show that the initial liquid surface area can be increased 2–19 times. The paper analyzes ways to control the process. The hydrodynamic disintegration characteristics of a biodiesel micro-emulsion fuel droplet are compared using 2D and 3D recording.

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Section: Hydrodynamic Interaction Regimes Of Widme and Wibdme Dropletsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall

et al. 2020

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“…Recently, the ability of TRF to characterize the soot formation characteristics of gasoline has drawn more attention since gasoline direct injection (GDI) engines are facing the soot emissions due to nonhomogeneous air-fuel mixing as a result of in-cylinder mixture preparation − and emissions regulations are becoming more stringent . Toluene is the representative of aromatics in gasoline, which is crucial for the prediction of soot formation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Liu

Hua

et al. 2018

Energy Fuels

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Characterization of soot formation is becoming more important for gasoline surrogate fuels, requiring a deeper understanding of the effect of toluene ratio on PAHs formation. In this work, the different size PAHs distribution in laminar diffusion flames was measured by PLIF technique, and the chemiluminescences of OH and CH radicals were recorded by ICCD coupled with band-pass filters. The effect of toluene addition to n-heptane and isooctane on the flame and PAHs formation was comparatively studied. Then, the chemical kinetic of PAHs was analyzed using the CHEMKIN Diffusion Flame model. The experimental results showed that the cool flame area ranks as n-heptane > isooctane > toluene may due to the NTC action. The OH intensity and flame lift-off height show a monotonous increasing trend with the toluene ratio. At the same toluene ratio, the peak OH intensity and flame lift-off height of n-heptane/toluene is lower than that of isooctane/toluene. The CH intensity in nheptane, isooctane, and toluene flames shows completely different distribution characteristics. As the toluene ratio increases, the 320 nm-LIF in n-heptane and isooctane flames shows a weakening monotonous increasing trend with different inflection points. The 360/400/450 nm-LIF in n-heptane and isooctane flames show a nonmonotonic trend with different peak points. The peak point is 50% toluene ratio in n-heptane/toluene flames and 40% in isooctane/toluene flames, and it corresponds exactly to the smoke point of the flame. The kinetic analysis showed that the benzyl has a significant effect on the formation of A2−A4 through the generation of C 10 H 9 , C 9 H 7 , and C 14 H 12 . A1 trend is dominated by C 6 H 5 CH 3 + H = A1 + CH 3 and A1 − + CH 4 → A1 + CH 3 . The trends of A2, A3 and A4 are mainly dominated by the reactions between their own dehydrogenation groups with H 2 .

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“…Then, Bai et al [10] characterized the different impingement regimes of the incident drops by Weber number. Then it was refined and developed well by other scholars [11][12][13] Recently, Cen et al [14] studied the dynamic break-up of the alternative biofuel impacting on the hot wall under the film boiling regime with different Weber number. They found that droplet breakup was dominated by Rayleigh instability, and the timing of jet break-up agreed well with the theory of Rayleigh instability.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Multi-Droplets Impacting on a Flat Wall

Luo¹,

Chang²

2022

Fundamental Research and Application of Droplet Dynamics

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Microscopic characteristics of fuel spray are very important for atomization and mixture formation. The droplet size, number density, velocity distribution as well as minimum distance reveal the quality of spray and atomization, which affects the subsequent combustion and emissions for different engines such as vehicle, marine and aircraft. Moreover, in the internal combustion engine, the spray-wall impingement is difficult to avoid, which is the main source for soot emissions. Nowadays, regulations for emissions become straight by governments. Therefore, it is urgent for us to alleviate the energy and emissions crisis. In this study, the droplets behaviors will be characterized under the related engine working state. Firstly, the experimental setup and measurement were explained in detail. Then, images process method was induced to calculate the droplet size, velocity and distance among them. Finally, results of the impinging spray were presented. One thing should be noted, as the dense region is not available to detect the droplets by the observation. Therefore, a spray “slicer” was designed and applied to cut the spray slim. Finally, multi-droplets were generated, and the results can be concluded as well. All the results could provide insights into the impacting behaviors for better understanding the droplet dynamics.

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Experimental investigation on the characteristic of jet break-up for butanol droplet impacting onto a heated surface in the film boiling regime

Cited by 27 publications

References 33 publications

Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall

Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Behaviors of Multi-Droplets Impacting on a Flat Wall

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