Splashing impact of a single drop onto very thin liquid films

Wang, Anbang; Chen, Chi‐Chang

doi:10.1063/1.1287511

Cited by 234 publications

(145 citation statements)

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“…In most of the investigations (Worthington 1876;Hobbs and Osheroff 1967;Engel 1967;Macklin and Metaxas 1976;Stow and Hadfield 1981;Rodriguez and Mesler 1985;Cai 1989;Shin and McMahon 1990;Cossali et al 1997Cossali et al , 1999Wang and Chen 2000;Manzello and Yang 2002;Š ikalo et al 2002;Š ikalo and Ganić 2006;Vander Wal et al 2006a, b;Huang and Zhang 2008), the droplet diameters are relatively ''large'' on a millimetric level (diameter above 1 mm) with relatively low velocities (below 5 m/s), while very few focused on micro-level droplets (diameter below 1 mm), where strong effects from viscous and capillary forces can be important in the impact processes. Furthermore, the diameters had a narrow range of variation (Engel 1967;Stow and Hadfield 1981;Cossali et al 1997Cossali et al , 1999Manzello and Yang 2002;Š ikalo et al 2002;Š ikalo and Ganić 2006;Vander Wal et al 2006a, b).…”

Section: Literature Reviewmentioning

confidence: 99%

“…Some investigations (Rodriguez and Mesler 1985;Wang and Chen 2000;Manzello and Yang, 2002;Rioboo et al 2003;Vander Wal et al 2006a) characterized the threshold of splashing/jetting without presenting models (denoted by ''threshold'' in Table 1), while others (Stow and Hadfield 1981;Hsiao et al 1988;Mundo et al 1995;Cossali et al 1997;Vander Wal et al 2006b;Huang and Zhang 2008) presented empirical models using dimensionless parameters (denoted by ''threshold model'' in Table 1). …”

Section: Literature Reviewmentioning

confidence: 99%

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Investigation of droplets impinging on a deep pool: transition from coalescence to jetting

2010

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An experimental investigation of droplets impinging vertically on a deep liquid pool of the same fluid was conducted. Coalescence and jetting as two of the main regimes were identified and studied. Five fluids, distilled water, technical ethanol, n-pentane, methanol and 1-propanol were used for providing different liquid-phase physical properties with density from 600 to 1,000 kg/m 3 , viscosity from 0.20 to 2.00 mPa s, and surface tension from 13.7 to 72.0 mN/m. Except for the experimental run of n-pentane, which was carried out in n-pentane saturated vapor, the ambient gas for the other experiments was air. The impact processes of micro-level (diameter below 1 mm) droplets were captured using a high-speed camera with a backlight. The observations, velocity and diameter ranges of the experimental runs were described, and based on them, the effects of the liquid-phase properties were studied. It was found that both low viscosity and low surface tension can increase the instability during impact processes. By curve-fitting, the transition from coalescence to jetting was characterized by using two models, one employing the Weber number (We) and the Ohnesorge number (Oh), and one employing the Froude number (Fr) and the Capillary number (Ca). Both models characterize the coalescence-jetting threshold well. The We-Oh model was based on a commonly used model from Cossali et al. (in Exp Fluids 22:463-472, 1997) for characterizing coalescence-splashing. For the small droplet diameters (below 1 mm) considered in this study, it was required to modify the We-Oh model with a diameter-dependent term to fit the sharp change in thresholds for fluids with relatively high viscosity. The Fr-Ca model has not previously been presented in the literature. A comparison of the two models with literature data (Rodriguez and Mesler, J Colloid Interface Sci 106(2): [347][348][349][350][351][352] 1985) indicates that they are also valid for impacts of droplets with diameters above 1mm. Calculation methods to generalize the two models were proposed.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Investigation of droplets impinging on a deep pool: transition from coalescence to jetting

2010

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“…The tendency for oil splashing depends on the properties of the water droplets, such as droplet size and velocity, as well as the properties of oil and its depth [26][27][28][29][30]. Table 3 shows the physical properties of water, gasoline, diesel fuel and some cooking oils [6,31,32].…”

Section: Water Mist Splash Testsmentioning

confidence: 99%

Extinguishment of Cooking Oil Fires by Water Mist Fire Suppression Systems

et al. 2004

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1023/B:FIRE. 0000039161.18616.86 Fire Technology, 40, 4, pp. 309-333, 2004-10-01 ABSTRACTA series of full-scale experiments were conducted in a mock-up commercial cooking area to study extinguishing mechanisms and effectiveness of water mist against cooking oil fires. The impact of water mist characteristics, such as spray angle, droplet size, flow rate, discharge pressure and type of nozzle, on the effectiveness of water mist against cooking oil fires was investigated. A series of oil splash experiments were also conducted to determine if the oil was splashed by water mist. In addition, the change in oil composition during heating and fire suppression was determined using Fourier Transform Infrared (FTIR) technique.The study showed that cooking oil fires were very difficult to extinguish, because they burned at high temperature and re-ignited easily due to changes in oil composition during heating and fire suppression. The water mist systems developed in the present work effectively extinguished cooking oil fires and prevented them from re-ignition. The spray angle, discharge pressure, and water flow rate were important factors to determine the effectiveness of water mist in extinguishing cooking oil fires.

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Section: Introductionmentioning

confidence: 99%

“…If the impacting surface is wet, the presence of the film suppresses secondary droplet generation relative to a dry surface case (Cossali et al 1997;Wang and Chen 2000;Rioboo et al 2003). A surface can be considered dry, if the ratio of the surface film thickness to the droplet diameter (H) is small (<∼0.1; Wang and Chen 2000). For aerosol inlets on aircraft, because of the large droplet impaction velocities and the low concentrations of the impacting activated droplets, the surface is expected to remain dry after droplet impaction (Povarov and Rastorguev 1986).…”

Section: Introductionmentioning

confidence: 99%

Characterizations of Cloud Droplet Shatter Artifacts in Two Airborne Aerosol Inlets

Craig

Moharreri

Schanot³

et al. 2013

Aerosol Science and Technology

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Aircraft-based aerosol sampling in clouds is complicated by the generation of shatter artifact particles from aerodynamic or impaction breakup of cloud droplets and ice particles in and around the aerosol inlet. Aerodynamic breakup occurs when the Weber number of a droplet, which primarily depends on the droplet size and the magnitude of the relative motion of the droplet and the local air mass, exceeds a critical value. Impaction breakup of a droplet occurs when the droplet's impaction breakup parameter, K, which is a combination of Weber and Ohnesorge numbers, exceeds a critical value. Considering these two mechanisms, the critical breakup diameters are estimated for two aerosol inlets of different designs-a conventional forward-facing solid diffuser inlet (SDI) and a cross-flow sampling sub-micron aerosol inlet (SMAI). From numerical simulations, it is determined that cloud droplets of all sizes will experience impaction breakup in SDI, while only droplets larger than ∼16 µm will experience impaction breakup in SMAI. The relatively better in-cloud sampling performance of SMAI is because of its cone design that slows the flow just upstream of the sample tube. The slowing upstream flow, however, causes aerodynamic breakup of drops larger than ∼100 µm. The critical breakup diameters determined from analysis of field data largely validate numerical predictions. The cross-flow sampling design of SMAI is seen to ensure that shatter artifacts in the inlet are minimal even when there are a significant number of particles larger that the critical breakup size. The study results, thus, suggest that the SMAI design presents an effective approach to sample interstitial particles from aircraft.

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Splashing impact of a single drop onto very thin liquid films

Cited by 234 publications

References 11 publications

Investigation of droplets impinging on a deep pool: transition from coalescence to jetting

Investigation of droplets impinging on a deep pool: transition from coalescence to jetting

Extinguishment of Cooking Oil Fires by Water Mist Fire Suppression Systems

Characterizations of Cloud Droplet Shatter Artifacts in Two Airborne Aerosol Inlets

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