Experimental investigation on the sputtering and micro-explosion of emulsion fuel droplets during impact on a heated surface

Cen, Chunze; Wu, Han; Lee, Chia-fon; Fan, Longjie; Liu, Fushui

doi:10.1016/j.ijheatmasstransfer.2018.12.007

Cited by 63 publications

(18 citation statements)

References 22 publications

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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%

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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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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“…This evaporation leads to bubble formation inside the droplet, this in turn enhances droplet size increase, i.e. spread (Cen et al, 2019). Consequently, droplet spread time is decreased in the case of emulsions.…”

Section: Resultsmentioning

confidence: 99%

“…Emulsion droplet impact on a heated surface is one of these areas that have been and being investigated. (Cen et al, 2019) studied the micro-explosion of water-in-diesel emulsion droplet during its impact on a heated surface and found a strong relation between droplet micro-explosion and the temperature of the surface. The same is found by (Ashikhmin et al, 2020) for biodiesel-in-water emulsion droplets impinging hot surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the previously set scope of work is further narrowed to the post-impact behaviour of the diesel-inwater emulsion droplet on a heated surface. This scope is of practical importance in the diesel engines and has been investigated by a number of research articles such as those shown in (Ashikhmin et al, 2020;Cen et al, 2019;Tanimoto & Shinjo, 2019). The essential part in such problems is liquid boiling and the so-called Leidenfrost phenomenon, which is defined as liquid levitation due to rapid vapour formation for the liquid being in contact with a solid surface at a temperature higher than that of the liquid boiling point (Rueda Villegas et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Post-Impact Characteristics of a Diesel-in-Water Emulsion Droplet on a Flat Surface Below the Leidenfrost Temperature

Faik

Theeb

Zhang

2020

Int. J. Renew. Energy Dev.

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Droplet impingement on solid surfaces takes place in a variety of industrial and environmental applications. However, there are still some areas that are not fully comprehended; emulsion droplet impact on a heated surface is one of these areas that require further comprehension. Hence, the present work represents an experimental exploration for spread characteristics of diesel-in-water (DW) emulsion droplet impacting a heated flat plate. Three different emulsions in which water concentration is set to 10%, 20%, and 30% of the overall emulsion content by volume have been tested in addition to the neat diesel. The temperature of the flat plate is varied over the range 20, 40, 60, and 80ºC respectively. Magnified high speed direct imaging and shadowgraphy have been used simultaneously for tracking droplet spread over the heated surface post impact. Droplet spread rate, maximum diameter, rebound height and velocity represent the main evaluated parameters. The results show that the maximum spread diameter is proportional while spread rate is inversely proportional to the increase in plate temperature for all diesel concentrations including the neat diesel. Whereas, droplet rebound height and velocity are found to be more responsive to the variation in diesel concentration than the variation in plate temperature, so they are both minimum in the case of neat diesel and are increasing by the decrease of diesel concentration in the emulsions.

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“…The interval time between each frame can be known by the camera shooting speed, so the droplet velocity-time diagram can be obtained by the stepwise difference method, and the final velocity of the droplet impacting the liquid surface was obtained by fitting. More setting details can be referred to in a previous study (Cen et al, 2019). The…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

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The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303-1343) and pool temperature (T, 50-260℃) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 millisecond. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to

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Experimental investigation on the sputtering and micro-explosion of emulsion fuel droplets during impact on a heated surface

Cited by 63 publications

References 22 publications

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

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

Post-Impact Characteristics of a Diesel-in-Water Emulsion Droplet on a Flat Surface Below the Leidenfrost Temperature

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

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