Analysis of the Water Droplet Evaporation Features with a Solid Nontransparent Inclusion in High-Temperature Gas Environment as a Part of University Research Work

Piskunov, Maxim; Щербинина, А. А.

doi:10.1016/j.sbspro.2015.10.057

Cited by 2 publications

(4 citation statements)

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“…These effects complicate the problem of selection of initial droplet sizes and their control during the motion to absorb the fire energy as well as to expel both the oxidant and flammable combustion products. Piskunov, Shcherbinina and Strizhak [4] investigated the features of evaporation, boiling and explosive breakup of water droplets containing a nontransparent inclusion when immersed in gaseous environment at high temperatures corresponding to typical fires. They conducted experiments with droplets containing 1 mm size non-transparent and non-metallic inclusions.…”

Section: Introductionmentioning

confidence: 99%

“…They conducted experiments with droplets containing 1 mm size non-transparent and non-metallic inclusions. The previous researches [3,4] were mainly focused on the explosive breakup phenomena of the droplet and showed that shape and size of inclusions have an influence on evaporation rate of droplet associated with total evaporation time or explosive breakup time in only high temperature range near film boiling regime. In practical engineering applications, it is very important in predicting the beginning and the end of nucleate boiling or film boiling regime at the interface between solid and liquid as well as instantaneous droplet sizes.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental study on the effect of initial liquid droplet size on the evaporation in a heterogeneous droplet

Sung

Nam²,

Hong

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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In the present work, we experimentally investigated the effect of initial liquid droplet size on the evaporation in the heterogeneous droplet. Spherical carbon and water were used for particle and liquid droplet comprising the heterogeneous droplet. four initial droplet volumes of 1, 2, 3 and 4 μl were considered when the diameter of the particle was 5 mm. The heterogeneous droplet was suspended with a rod at 20 cm away from the radiator which surface temperature was fixed to 473 K. Ambient temperature and relative humidity remained 296 K and 40 %, respectively, during the experiment. As the results, the evaporation rate of 4 μl case increased about 1.8 times compared with that of 1 μl case. The evaporation rate increased almost linearly with the volume ratio, and that is related closely with the contact surface between particle and water droplet. Contact surface area remained almost constantly with time, whereas it increased with the initial volume of water droplet. The energy from radiator can be accumulated at the contact surface at the side of particle, thereby intensifying the evaporation of water droplet because more heat transfers from particle to droplet through the contact surface. Consequently, the initial volume of liquid droplet is one of the influence factors on the evaporation rate in the heterogenous droplet. Keywords Contact surface area, Evaporation rate, Heat transfer, Heterogeneous droplet IntroductionDrop evaporation is an important topic of interest because it plays a crucial role in many engineering applications such as spray drying, fuel injection into combustion engines, medical care, controlling the deposition of particles on solid surfaces, rapid cooling by drop wise heat exchange and also occurs in natural processes such as rain, fog, dew, snow formation and is used in meteorological estimates [1]. Nowadays, one of the most important directions of development in the field of fire extinguishing technologies is the improvement of heat exchange between extinguishing liquid and combustion products in flame zone and in its close vicinity [2]. Firstly, sprinkler systems are intended to either control the fire or to suppress the fire. For instances, sprinklers are used to control the heat release rate of the fire to prevent building structure collapse, and pre-wet the surrounding combustibles to prevent fire spread. Lastly, water curtain, which is a thermal and smoke control system in a fire hazard, is mainly used to diminish radiative heat transfer from fire and prevent spreading of smoke. In the development and deployment of practical systems, it is very important to understand how the flame extinction characteristics depend on droplet diameter, number density, and overall water loading. The traditional approach of droplet breakup when spraying extinguishing liquid received a lot of criticisms. In real practice the droplets of extinguishing liquid coalesce during their motion through flames. Moreover, soot particles in fire plume or ceiling jet flow have potential for adhering to th...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on the effect of initial liquid droplet size on the evaporation in a heterogeneous droplet

Sung

Nam²,

Hong

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

View full text Add to dashboard Cite

show abstract

“…Moreover, we emphasize that in the conditions of absence of the theoretical foundation describing the phase changes of homogeneous and heterogeneous liquids when heated in a high-temperature (1000-1100 K) environments, the performance of experimental research in the given field is appropriate. The analysis and processing of the obtained empirical data will allow improving the existing heterogeneous high-temperature technologies (for example, [4][5][6]). …”

Section: Introductionmentioning

confidence: 99%

Evaporation and Vapor Formation of Graphite Suspensions Based on Water in a High-Temperature Gas Environment: an Experimental Investigation

Borisova

Piskunov

Rybatskyy

2016

EPJ Web of Conferences

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Abstract. We performed an experimental research on evaporation and vapor formation of water droplets containing large (2 mm in size) and small (0.05 mm and 0.2 mm in diameter) graphite inclusions, when heated in a high-temperature gas environment. We applied a highspeed (up to 10 4 fps) video recording to establish mechanisms of the processes considered.Moreover, we revealed the positive influence of addition of small graphite inclusions on intensifying the evaporation of heterogeneous suspension droplets. In addition, we made the assumption on the formation of vapor layer around the 10 and 15 μl suspension droplets, as well as its negative influence on the lifetimes of suspension droplets τh (increasing the times) in a high-temperature gas environment.

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Analysis of the Water Droplet Evaporation Features with a Solid Nontransparent Inclusion in High-Temperature Gas Environment as a Part of University Research Work

Cited by 2 publications

References 11 publications

Experimental study on the effect of initial liquid droplet size on the evaporation in a heterogeneous droplet

Experimental study on the effect of initial liquid droplet size on the evaporation in a heterogeneous droplet

Evaporation and Vapor Formation of Graphite Suspensions Based on Water in a High-Temperature Gas Environment: an Experimental Investigation

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