An experimental study of a water droplet impinging on a liquid surface

Manzello, Samuel L.; Yang, Jiann C.

doi:10.1007/s00348-001-0401-8

Cited by 134 publications

(72 citation statements)

References 26 publications

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“…Most studies examine fluid to fluid or fluid or solid impacts and the effects occurring on the surface hit by the drops (Jung and Hutchings 2012;Kang and Lee 2000;Lohse et al 2004;Manzello and Yang 2002;Mutchler and Hansen 1970;Scheller and Bousfield 1995;Xu et al 2005). However, the impact of alginate in polymerization solution is a special case in impact research and analyzing surface effects does not map the whole process.…”

Section: Discussionmentioning

confidence: 99%

A new validation method for clinical grade micro-encapsulation: quantitative high speed video analysis of alginate capsule

et al. 2013

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Micro-encapsulation of cells or tissues is a promising treatment for hormone deficiency diseases (diabetes mellitus, hypoparathyroidism etc.). Alginate, a polymer from marine brown algae, is excellent for encapsulation. Its hydrated structure keeps out large antibodies and immune system cells while allowing diffusion of nutrients and therapeutic factors. Alginate droplets, containing cells, are crosslinked to form stable spherical hydrogel capsules. The position of grafts within the capsule, which decisively affects vulnerability to the host's immune response, has previously not been investigated during the process of crosslinking. We describe for the first time quantitative, high speed video analysis of two perpendicular projections of capsule shape and load during crosslinking. This gives characteristic ''deformation plots'' of the capsule and fully resolved ''trajectories plots'' of capsule load movement. We identify four stages of capsule formation, giving insights into physico-chemical processes involved. Further, we show that mechanical stress on the load can be deduced by measurement of the capsule's shape.

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Section: Discussionmentioning

confidence: 99%

A new validation method for clinical grade micro-encapsulation: quantitative high speed video analysis of alginate capsule

et al. 2013

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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%

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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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“…There are several reviews of the droplet impact outcomes, such as [3] , and there are a number of theories about the crater evolution [4] for droplets of same temperature and liquid impacting on a film [5]. However there are few studies on droplets of different temperature to the film [6,7]. This work is part of an experimental study to provide data for comparison with models to confirm or deny if they are still valid in the case where the film liquid has different properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Film Temperature on crater morphology during the impact of a single droplet

2016

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Abstract. The effect of varying the film temperature from 15C to 60 C is investigated using high speed video imaging. It is demonstrated that increasing the temperature difference between the droplet and film liquid changes the size and frequency of the secondary droplets. The impact can be split into three regimes. In the crater expansion regime, the crater follows a self-similar behaviour. In the second stage, the crater becomes deeper and wider at higher temperatures possibly due to decrease in the viscosity or surface tension. It is seen that the crater collapse is less dependent on the temperature and occurs at fixed time for a particular Webber number.

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An experimental study of a water droplet impinging on a liquid surface

Cited by 134 publications

References 26 publications

A new validation method for clinical grade micro-encapsulation: quantitative high speed video analysis of alginate capsule

A new validation method for clinical grade micro-encapsulation: quantitative high speed video analysis of alginate capsule

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

The Effect of Film Temperature on crater morphology during the impact of a single droplet

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