Drop impact of non-Newtonian dairy-based solutions

Balzan, Miguel A.; Abdollahi, Ayoub; Wells, Frederick S.; Willmott, Geoff R.

doi:10.1016/j.colsurfa.2021.126895

Cited by 14 publications

(7 citation statements)

References 56 publications

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“…7 A full list of calculated values of A for various combinations of fluids and surfaces when using the energy conservation approach is included in ESI †. The flat PDMS surface produced A = 1.24 ± 0.01 for all the fluids combined, a value very consistent with data collected by Laan et al 7 Elsewhere, two recent studies 49,50 have found values of A = 1.25 ± 0.1 and A = 1.21 ± 0.7 for non-Newtonian dairy product drop impacts on unstructured stainless steel.…”

Section: Resultssupporting

confidence: 73%

“…7 A full list of calculated values of A for various combinations of fluids and surfaces when using the energy conservation approach is included in ESI. † The flat PDMS surface produced A = 1.24 AE 0.01 for all the fluids combined, a value very consistent with data collected by Laan et al 7 Elsewhere, two recent studies 49,50 viscous losses. Nevertheless the fit parameters are much more consistent with values for Newtonian fluids than those determined using the alternative approach (eqn ( 6)).…”

Section: Spread Factorsupporting

confidence: 88%

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Influence of rheology and micropatterns on spreading, retraction and fingering of an impacting drop

Pandian¹,

Broom²,

Willmott³

2023

Soft Matter

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Section: Resultssupporting

confidence: 73%

Section: Spread Factorsupporting

confidence: 88%

Influence of rheology and micropatterns on spreading, retraction and fingering of an impacting drop

Pandian¹,

Broom²,

Willmott³

2023

Soft Matter

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“…However, Yokoyama et al 47 found that blood, which exhibits strong shear-thinning character, had almost the same spreading and splashing behavior as a Newtonian fluid droplet with a μ value close to μ ∞ . Recently, Balzan et al 48 conducted an experimental work to show that the maximum spreading diameter of shearthinning droplets depends on the viscosity at high shear rates. All of these works suggest that the shear-thinning property may alter the dynamic wetting process, possibly due to the different levels of viscous dissipation with varying viscosities.…”

Section: ■ Introductionmentioning

confidence: 99%

“…When a shear-thinning fluid droplet impinges on a solid surface, the shear viscosity varies continuously between the μ 0 and the μ ∞ , associated with shear deformation. Many efforts have been devoted to understanding the wetting process of impact droplets with shear-thinning fluids. ,− An and Lee showed that the shear-thinning droplets on solid surfaces tend to have a more rapid shape evolution than the droplets with the same μ 0 . However, Yokoyama et al found that blood, which exhibits strong shear-thinning character, had almost the same spreading and splashing behavior as a Newtonian fluid droplet with a μ value close to μ ∞ .…”

Section: Introductionmentioning

confidence: 99%

Study on the Bouncing Behaviors of a Non-Newtonian Fluid Droplet Impacting on a Hydrophobic Surface

et al. 2023

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The control of a droplet bouncing on a substrate is of great importance not only in academic research but also in practical applications. In this work, we focus on a particular type of non-Newtonian fluid known as shear-thinning fluid. The rebound behaviors of shear-thinning fluid droplets impinging on a hydrophobic surface (equilibrium contact angle θ eq ≈ 108°and contact angle hysteresis Δθ ≈ 20°) have been studied experimentally and numerically. The impact processes of Newtonian fluid droplets with various viscosities and non-Newtonian fluid droplets with dilute xanthan gum solutions were recorded by a high-speed imaging system under a range of Weber numbers (We) from 12 to 208. A numerical model of the droplet impact on the solid substrate was also constructed using a finite element scheme with the phase field method (PFM). The experimental results show that unlike the Newtonian fluid droplets where either partial rebound or deposition occurs, complete rebound behavior was observed for non-Newtonian fluid droplets under a certain range of We. Moreover, the minimum value of We required for complete rebound increases with xanthan concentration. The numerical simulations indicate that the shear-thinning property significantly affects the rebound behavior of the droplets. As the amount of xanthan increases, the high shear rate regions shift to the bottom of the droplet and the receding of the contact line accelerates. Once the high shear rate region appears only near the contact line, the droplet tends to fully rebound even on a hydrophobic surface. Through the impact maps of various droplets, we found that the maximum dimensionless height H max * of the droplet increases almost linearly with We as H max * ∼ αWe. In addition, a critical value H max, c * for the distinction between deposition and rebound for droplets on the hydrophobic surface has been theoretically derived. The prediction of the model shows good consistency with the experimental results.

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“…Since the pioneering work of Worthington, droplet impact on solid surfaces has attracted extensive attention, as it commonly occurs in nature and is critical for various industrial applications such as food production, agriculture, spray coating, lab-on-a-chip, and three-dimensional (3D) printing. − In many industrial applications such as self-cleaning, anti-icing, and antierosion, various types of water-repellent surfaces with minimum droplet impact contact time have been developed. Recently, studies have been focused on innovative methods for modifying solid surfaces to reduce contact time.…”

Section: Introductionmentioning

confidence: 99%

Impact Dynamics of Non-Newtonian Droplets on Superhydrophobic Surfaces

et al. 2023

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Droplet impact behavior on a solid surface is critical for many industrial applications such as spray coating, food production, printing, and agriculture. For all of these applications, a common challenge is to modify and control the impact regime and contact time of the droplets. This challenge becomes more critical for non-Newtonian liquids with complex rheology. In this research, we explored the impact dynamics of non-Newtonian liquids (by adding different concentrations of Xanthan into water) on superhydrophobic surfaces. Our experimental results show that by increasing the Xanthan concentration in water, the shapes of the bouncing droplet are dramatically altered, e.g., its shape at the separation moment is changed from a conventional vertical jetting into a "mushroom"-like one. As a result, the contact time of the non-Newtonian droplet could be reduced by up to ∼50%. We compare the impact scenarios of Xanthan liquids with those of glycerol solutions having a similar apparent viscosity, and results show that the differences in the elongation viscosity induce different impact dynamics of the droplets. Finally, we show that by increasing the Weber number for all of the liquids, the contact time is reduced, and the maximum spreading radius is increased.

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Drop impact of non-Newtonian dairy-based solutions

Cited by 14 publications

References 56 publications

Influence of rheology and micropatterns on spreading, retraction and fingering of an impacting drop

Influence of rheology and micropatterns on spreading, retraction and fingering of an impacting drop

Study on the Bouncing Behaviors of a Non-Newtonian Fluid Droplet Impacting on a Hydrophobic Surface

Impact Dynamics of Non-Newtonian Droplets on Superhydrophobic Surfaces

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