The impact of a single drop on a wetted solid surface

Cossali, Gianpietro; Coghe, A.; Marengo, Marco

doi:10.1007/s003480050073

Cited by 529 publications

(462 citation statements)

References 15 publications

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“…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%

“…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%

“…It has been stated previously in the literature that while gravity-related effect can be described by the Bond number ; the effect from gravity on the phenomena of droplet impacts is typically not important (Mundo et al 1995;Cossali et al 1997). However, as the droplet size decreases into the submillimetric range, the surface-tension effect becomes significantly more important than the gravitational effect.…”

Section: Dimensional Analysismentioning

confidence: 99%

“…A similar reasoning can be done for the viscous effect as for the surface-tension effect. In this work, a threshold model using the Froude number (Stow and Hadfield 1981;Hsiao et al 1988;Mundo et al 1995;Cossali et al 1997;Rioboo et al 2003;Vander Wal et al 2006b;Huang and Zhang 2008) selected two or less dimensionless Huang and Zhang (2008) can be written in the form…”

Section: Dimensional Analysismentioning

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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