Boiling from liquid drops impact on a heated wall

Liang, Gangtao; Shen, Shengqiang; Guo, Yali; Zhang, Jili

doi:10.1016/j.ijheatmasstransfer.2016.04.061

Cited by 112 publications

(29 citation statements)

References 44 publications

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“…These parameters define the Reynolds (Re=ρV0D0/μ), Weber (We=ρV0 2 D0/σ) and Ohnesorge (Oh=√We/Re) dimensionless numbers that are frequently utilised to macroscopically characterise the process (where ρ is the liquid droplet density, σ the liquid vapour surface tension, μ the viscosity, D0 the initial droplet diameter and V0 the impact velocity). Comprehensive reviews of recent advancements in this area, from the flow dynamic point of view, can be found in [6], [7].In general, the post-impact outcome regimes can be illustrated on regime maps as a function of surface temperature and impact Weber number, as reported in [4], [8]- [10] for various single component liquids. In [10], the impact outcomes are defined by means of hydrodynamic regimes and droplet morphology (stick, splash, break-up and rebound), while in the rest, more attention is given to the heat transfer associated with the corresponding boiling modes; the regimes identified include film evaporation for TW<TBP, nucleate boiling for TBP<TW<TL and film boiling for TW>TL.…”

Section: Introductionmentioning

confidence: 99%

“…Comprehensive reviews of recent advancements in this area, from the flow dynamic point of view, can be found in [6], [7].In general, the post-impact outcome regimes can be illustrated on regime maps as a function of surface temperature and impact Weber number, as reported in [4], [8]- [10] for various single component liquids. In [10], the impact outcomes are defined by means of hydrodynamic regimes and droplet morphology (stick, splash, break-up and rebound), while in the rest, more attention is given to the heat transfer associated with the corresponding boiling modes; the regimes identified include film evaporation for TW<TBP, nucleate boiling for TBP<TW<TL and film boiling for TW>TL. Moreover, upon impacting on a heated surface with temperature much higher than liquid's boiling temperature, a thin layer of the droplet own vapour forms between the solid surface and the droplet, that is typically only a few nanometres thick [4]; this layer may prevent the contact between liquid and solid which, in turn, decreases the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

et al. 2017

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The head-to-head impact of diesel-fuel droplets on a polished spherical brass target has been investigated experimentally. High-speed imaging was employed to visualize the impact process for wall surface temperatures and Weber and Reynolds numbers in the ranges of 140-340 °C, 30-850, and 210-1135, respectively. The thermohydrodynamic outcome regimes occurring for the aforementioned ranges of parameters were mapped on a We-T diagram. Seven clearly distinguishable postimpact outcome regimes were identified, which are conventionally called the coating, splash, rebound, breakup-rebound, splash-breakup-coating, breakup-coating, and splash-breakup-rebound regimes. In addition, the effects of the Weber number and surface temperature on the wettability dynamics were examined; the temporal variations of the dynamic contact angle, dimensionless spreading diameter, and liquid film thickness forming on the solid particle were measured and are reported.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

et al. 2017

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“…As a leading work and reference, various factors affecting the characteristics of droplet-plane collision have been studied, including the impact velocity, 9 plane roughness, 10 wetness of plane, 11 and the impact angle. 12 Further research is about the collisions of droplet with the cross section of a cylinder object 13,14 and with the side of a cylinder. 15,16 For the study of droplet-particle collision behaviors, considerable work has been done under an ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of liquid film behavior during droplets–polyethylene particle collision

et al. 2020

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Nowadays, the droplet–particle collision characteristics in the gas‐phase ethylene polymerization process are still unclear. The high‐speed photography and a quasi‐circle imaging approach are employed to study the collision interaction characteristics between liquid droplets and polyethylene particles. The liquid film evolution is studied through variations of the film thickness on the particle north pole, the dynamic contact angle, center angle and film thickness at the maximum extension. Results have found that for n‐hexane the threshold temperature of the recoil happening increases with increasing initial Weber number, but for 1‐hexene it is stable. Over 70°C evaporation and splash occurs immediately. Under low Weber numbers, the water droplet stays for damping oscillations, the reference stable height of which is linearly related to temperatures. Moreover, three regimes of film thickness variation with time are identified and mathematically described, while Regime 3 characteristics are found strongly dependent on the liquid species, Weber number, and particle temperature.

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“…An experimental study on the boiling of liquid drops impinging on a heated wall exhibited that, for single-phase fluids the effect of surface temperature on the wetting characteristics is insignificant (Liang et al, 2016). It is interesting to note from literature that, observations on the temperature dependence of nanofluid wetting dynamics employing nanoparticles of different shape are contradictory in nature.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the effect of nanoparticle shape on the dynamics of Leidenfrost droplet impingement

Ulahannan¹,

Krishnakumar²,

Nair³

et al. 2020

Exp. Comput. Multiph. Flow

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Extensive investigations have been carried out on the thermo-hydrodynamics of nanofluid droplet interaction with heated and non-heated flat surfaces. However, the influence of shape of nanoparticles on the dynamics of droplet impingement on heated flat surfaces is yet to be explored in detail. In this study, hydrodynamics of nanofluid droplet impingement process on heated and mechanically polished aluminum substrate was studied using dissolved Al2O3 nanoparticles having spherical as well as cylindrical shapes. Nanofluids of 0.3% volume fractions were prepared from spherical Al2O3 particles of mean size less than 50 nm and from cylindrical Al2O3 particles of 2-6 nm in diameter and 200-400 nm in length. It was observed that, the impact dynamics is different from that of base pure fluid owing to the presence of nanoparticles. Leidenfrost temperatures of both nanofluids were dropped drastically in comparison with pure liquid. Further, the residence time, spread factor as well as retraction height also exhibit a different behavior against the base fluid. Detailed investigations were carried out for different Weber numbers (We = 18-159) and surface superheat and results obtained were compared with de-ionized (DI) water.

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Boiling from liquid drops impact on a heated wall

Cited by 112 publications

References 44 publications

Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

Experimental characterization of liquid film behavior during droplets–polyethylene particle collision

An experimental study on the effect of nanoparticle shape on the dynamics of Leidenfrost droplet impingement

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