Impact of a heterogeneous liquid droplet on a dry surface: Application to the pharmaceutical industry

Bolleddula, Daniel; Berchielli, Alfred; Aliseda, Alberto

doi:10.1016/j.cis.2010.06.003

Cited by 105 publications

(67 citation statements)

References 80 publications

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“…This may be due to the fact that cellulose nanofibers are accumulated on the liquid-air surface, which reduces the effective surface energy. Finally, the studied impact surface (banana and eggplant epicarps) had no significant effect on the maximum spread factor; this is consistent with the results reported by Andrade et al (2012a), Bolleddula et al (2010), and Clanet, B eguin, Richard, and Qu er e (2004).…”

Section: Maximum Spread Factor: Influence Of Coating Formulations Forsupporting

confidence: 94%

“…For all coating formulations and epicarps, the values of x max increased with We number due to the increase of drop impact velocity. This result confirmed previous observations that inertia controls the spreading phase (Andrade et al, 2012a;Bolleddula et al, 2010;Sikalo, Marengo, Tropea, & Ganic, 2002). Coating formulations with higher apparent viscosity (S1 and S7) showed lower x max values, because the dissipated energy during droplet spread increases with increasing viscosity, thus x max for a given impact energy decreases with increasing viscosity.…”

Section: Maximum Spread Factor For Various We Numberssupporting

confidence: 92%

“…In particular, drops are impacted and may rebound, splash, or deposit cleanly as it is desirable (Andrade, Skurtys, & Osorio, 2012aBolleddula, Berchielli, & Aliseda, 2010;Werner, Jones, Paterson, Archer, & Pearce, 2007). After the initial impact with a solid surface, drops will spread due to inertial forces and typically will form a thin disk.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Drop impact of gelatin coating formulated with cellulose nanofibers on banana and eggplant epicarps

Andrade

Skurtys

Osorio

2015

LWT - Food Science and Technology

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Section: Maximum Spread Factor: Influence Of Coating Formulations Forsupporting

confidence: 94%

Section: Maximum Spread Factor For Various We Numberssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Drop impact of gelatin coating formulated with cellulose nanofibers on banana and eggplant epicarps

Andrade

Skurtys

Osorio

2015

LWT - Food Science and Technology

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“…In the case of more viscous Newtonian fluids, the main difficulty in order to reach a theoretical prediction is to account for the viscous dissipation of the drop when it spreads, as complex flows are involved. In this optics, several approaches have been proposed yielding reasonably good agreements with experimental data [4,16,17].…”

Section: Introductionmentioning

confidence: 75%

Interplay between viscosity and elasticity in freely expanding liquid sheets

2016

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We investigate the dynamics of freely expanding liquid sheets prepared with fluids with different rheological properties, (i) viscous fluids with a zero-shear viscosity η0 in the range (1 − 1000) mPa.s and (ii) viscoelastic fluids whose linear viscoelastic behavior in the frequency range (0.1 − 100) rad/s can be accounted for by a Maxwell fluid model, with characteristic elastic modulus, G0, relaxation time, τ , and zero-shear viscosity, η0 = G0τ , can be tuned over several orders of magnitude. The sheets are produced by impacting a drop of fluid on a small cylindrical solid target. For viscoelastic fluids, we show that, when τ is shorter than the typical lifetime of the sheet (∼ 10 ms), the dynamics of the sheet is similar to that of Newtonian viscous liquids with equal zero-shear viscosity. In that case, for little viscous samples (η0 <∼ 30 mPa.s), the maximal expansion of the sheet, dmax, is independent of η0, whereas for more viscous samples, dmax decreases as η0 increases. We provide a simple model for the dependence of the maximal expansion of the sheet with the viscosity that accounts well for our experimental data. By contrast, when τ is longer than the typical lifetime of the sheet, the behavior drastically differs. The sheet expansion is strongly enhanced as compared to that of viscous samples with comparable zero-shear viscosity, but is heterogeneous with the occurrence of cracks, revealing the elastic nature of the viscoelastic fluid.

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“…50 Therefore, it has been extensively studied for over a century using both experimental [51][52][53][54][55] and computational tools. 56,57 Due to recent advances in technology in high speed photography and in drop generation techniques, researchers were able to perform detailed experimental studies of impact dynamics using a wide range of drop viscosities [58][59][60] , diameters [61][62][63] , and surface temperatures. 64 The findings from these investigations improved our understanding of the drop-surface impact process and also strengthened our capability to quantitatively predict the outcome of the impact event.…”

Section: Introductionmentioning

confidence: 99%

Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

Yeong

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Due to their excellent water repellent characteristics, superhydrophobic surfaces have been hypothesized to be icephobic. This is based on the premise that water droplets will be repelled from the surface before ice nucleation can occur. The icephobic nature of these surfaces provides an attractive solution to current icing problems that can occur in aerospace applications. However, significant challenges remain before anti-wetting coatings could be implemented as an effective ice mitigation tool. For example, the majority of current synthetic superhydrophobic surfaces are fragile and unable to withstand the harsh environmental conditions that are encountered by aerospace applications. In addition, their static and dynamic wettability at varying temperatures and humidity, as well as their ice-shedding performance under the impact of a super-cooled icing cloud, are not well understood.Therefore, in this dissertation, fabrication techniques for a previously developed nanocomposite surface were improved so that coatings of consistent antiwetting performance and durability could be produced. The icephobicity of this nanocomposite coating was then systematically investigated. First, an experiment was conducted to study the wettability of a water drop on the coating for a full temperature cycle (20 -3The investigation was then extended to study the impact and rebound dynamics of a iv drop on an inclined coating, at different fluid viscosities and at various temperatures (50°C to -8°C). This was followed by a study of ice adhesion strength of the coatings -cooled water droplets. The receding contact angle was discovered from these experiments to be a key parameter in controlling superhydrophobic wettability and ice adhesion. Therefore, the receding angle depinning dynamics from a superhydrophobic surface were also studied in detail at micron length scales and at microsecond temporal scales. In summary, results from this dissertation revealed the crucial parameters that govern the icing performance of a nanocomposite superhydrophobic surface.

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Impact of a heterogeneous liquid droplet on a dry surface: Application to the pharmaceutical industry

Cited by 105 publications

References 80 publications

Drop impact of gelatin coating formulated with cellulose nanofibers on banana and eggplant epicarps

Drop impact of gelatin coating formulated with cellulose nanofibers on banana and eggplant epicarps

Interplay between viscosity and elasticity in freely expanding liquid sheets

Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

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