Influence of leaf surface wettability on the drop splash phenomenon

Papierowska, Ewa; Mazur, Rafał; Stańczyk, Tomasz; Beczek, Michał; Szewińska, Joanna; Sochan, Agata; Ryżak, Magdalena; Szatyłowicz, Jan; Bieganowski, Andrzej

doi:10.1016/j.agrformet.2019.107762

Cited by 33 publications

(16 citation statements)

References 51 publications

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“…the rigidity of the leaf as well as macrotopographic features such as vascular bundles or trichomes, Fig. 3C), and can differ drastically from the theoretical predictions (Papierowska et al, 2019). Note that all of the above studies classify leaves by wettability (i.e.…”

Section: Wetting Versus Water Sheddingmentioning

confidence: 79%

An ecological perspective on water shedding from leaves

Lenz

Bauer

Ruxton

2021

Journal of Experimental Botany

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Water shedding from leaves is a complex process depending on multiple leaf traits interacting with rain, wind and air humidity, and with the entire plant and surrounding vegetation. Here, we synthesise the current knowledge of the physics of water shedding with implications for plant physiology and ecology. We argue that the drop retention angle is a more meaningful parameter to characterise the water shedding capacity of leaves than the commonly measured static contact angle. The understanding of the mechanics of water shedding is largely derived from laboratory experiments on artificial rather than natural surfaces, often on individual aspects such as surface wettability or drop impacts. In contrast, field studies attempting to identify the adaptive value of leaf traits linked to water shedding are largely correlative in nature, with inconclusive results. We make a strong case for taking the hypothesis-driven experimental approach of biomechanical lab studies into a real-world field setting to gain a comprehensive understanding of leaf water shedding in a whole-plant ecological and evolutionary context.

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Section: Wetting Versus Water Sheddingmentioning

confidence: 79%

An ecological perspective on water shedding from leaves

Lenz

Bauer

Ruxton

2021

Journal of Experimental Botany

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“…Although the hydrodynamics have been extremely well elucidated, experimentally, numerically and theoretically (Yarin 2006;Josserand and Thoroddsen 2016;Yarin et al 2017), one quantity remains extremely elusive for the case of a drop impact exceeding the splash threshold, namely the amount of residual liquid remaining on the surface, or alternatively, the amount of liquid splashed and re-emitted during the impact. In all cases, the residual mass on the surface is a quantity of great interest since it directly influences subsequent processes such as heat transfer (spray cooling (Breitenbach et al 2018)), wetted area (spray coating (Andrade et al 2013), encapsulation, leaf coverage (Papierowska et al 2019)) and ice accretion (Szilder et al 2002). Some work regarding the residual mass of a drop detaching from a fibre is available (Aziz et al 2018;Jamali et al 2021;Holweger et al 2021); however, the involved physics likely differ significantly from the mass loss from drop splashing on plane substrates.…”

Section: Introductionmentioning

confidence: 99%

Measurements and modelling of the residual mass upon impact of supercooled liquid drops

2021

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The mass of liquid remaining on a substrate following a drop impact is a crucial quantity for modelling of numerous phenomena, e.g. spray cooling, spray coating or aircraft icing. In the present study, a method to measure this residual mass after impact of liquid drops is introduced. This method is also applicable to supercooled drops, which may freeze upon impact on cold surfaces. Using the data obtained from extensive measurements in which the size, impact speed and temperature of the drops was varied, a modelling of the residual mass is formulated, following closely the theory of Riboux and Gordillo (Phys Rev Lett 113(2):024507, 2014. 10.1103/PhysRevLett.113.024507). A key adaptation of this model accounts for the deformation of drops immediately prior to impact. This modified theoretical model results in very good agreement with experiments, allowing prediction of residual mass for a given impact situation. Graphical abstract

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“…Finally, variable-size atomized water-droplets spread downstream and converge on a solid surface. That is, the stochastic splash is of macroscopic splash characteristics with an enormous number of water-droplets, which is different from applications in other fields, e.g., forest fire fighting (liquid droplets impinging on a solid surface) [21], pesticide spraying (liquid droplets impinging on leaf surface) [22], diving (a solid falling into a liquid surface) [23], wind-driven rain erosion (rain droplets driven by high-speed wind impinging on building facades) [24], rain-wind-induced vibrations (rain droplets driven by high-speed wind impinging on beam or rope structures) [25], vehicle soiling and aircraft icing problems (droplets impinging on a high-speed moving boundary) [26], etc. Currently, all random splash models are conducted under atmospheric pressure with particular emphasis on various hydraulic conditions of inflow waterjets.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Effects of Atomized Rain of a High Velocity Waterjet to Downstream Area in Low Ambient Pressure Environment

Liu

Lian

Liu

et al. 2020

Water

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A better understanding of the atomized rain characteristics in low ambient pressure areas is beneficial in reducing the jeopardizing effect of flood discharge atomization on high-altitude hydropower stations. A random splash experiment is designed with two measurement planes to investigate the effects of low ambient pressure on downstream atomized rain under the complicated conditions of low ambient pressure (within 0.60P0~1.00P0) and high waterjet velocity (at a magnitude of 10 m/s). The results demonstrate that the atomized rain (rain intensity ≥ 2 mm/h) downstream, characterized by two-dimensional distribution, can be enhanced by decreasing the ambient pressure and by increasing the inflow discharge. When the ambient pressure decreases at the same inflow discharge, both the distance of the rain intensity lines (40 mm/h, 10 mm/h, 2 mm/h) in the horizontal plane from the constricted nozzle outlet and the average rain amount in the inclined plane within the atomized source ratio of ((0~30) × 10−3)% appear as “linear” growth. With the ambient pressure decreasing by 0.10P0, the range of those characteristic rain intensity lines is expanded by 0.68%~1.37%, and the average rain amount is enlarged by 11.06%~20.48%. When keeping the low ambient pressure unchanged, both the point average rain intensity reduction along the releasing centerline and the surface average rain amount growth with increased inflow discharge all follow an exponential function. The aeration reduction in the waterjet boundary and the resistance reduction in atomized water-droplets are contributing factors for the enhancement effect of low ambient pressure. This study can enable the establishment of a foundation to further predict flood discharge atomization in a high-altitude environment.

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Influence of leaf surface wettability on the drop splash phenomenon

Cited by 33 publications

References 51 publications

An ecological perspective on water shedding from leaves

An ecological perspective on water shedding from leaves

Measurements and modelling of the residual mass upon impact of supercooled liquid drops

An Experimental Study on the Effects of Atomized Rain of a High Velocity Waterjet to Downstream Area in Low Ambient Pressure Environment

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