Effects of temperature-dependent contact angle on the flow dynamics of an impinging droplet on a hot solid substrate

Venkatesan, Jagannath; Rajasekaran, Sangeetha; Das, Amit; Ganesan, Sashikumaar

doi:10.1016/j.ijheatfluidflow.2016.10.003

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…3) Although pesticide use can increase crop yields in the short term, their excessive use leaves many hidden dangers that can be easy to ignore. For example, pesticide droplets can easily roll off the surface of rice leaves, 4,5) causing only 20-30% of the pesticides to be deposited on the target. The remaining 70-80% is lost to the soil, 6) which leads to the pesticide having a low degree of wet spreading on the plant foliage 7,8) and causing ecological pollution.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

et al. 2022

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The effects of external factors such as temperature, humidity, pesticide formulation, and pesticide concentration on the contact angle of pesticide droplets on rice leaf surfaces were analyzed. The experiments showed that there were significant differences in the contact angles of droplets on the leaf surfaces under different temperatures and humidity. As the ambient temperature increased, the contact angle first decreased and then increased, reaching a minimum value at 25°C. With a gradual increase in humidity, the contact angle significantly increased and reached a maximum at 100% humidity. Finally, it was concluded that both the formulation and concentration of the pesticide had a significant effect on the contact angle of droplets on rice leaf surfaces. The experiments also illustrated that the effects of the pesticide formulation and concentration on the contact angle were more significant than those of temperature and humidity.

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Section: Introductionmentioning

confidence: 99%

Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

et al. 2022

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“…So called generalized Navier boundary conditions (GNBC) derived from the molecular dynamics (MD) theory for the Navier-Stokes equations have been proven to capture the dynamics of the triple contact line adequately (see [16,17,18,19]). GNBC have already been successfully applied for simulating free surface flows with ALE FEM for various multiphysics phenomena such as free surface flows in [13], sliding/rolling droplets kinematics in [20,21], droplets kinematics on non-isothermal surfaces in [22], chemotaxis phenomena in [23,24], to name a few. The main goal of this paper is the derivation of the energy stable numerical scheme based on the mathematical model incorporating GNBC and not the investigation of GNBC themselves.…”

Section: Introductionmentioning

confidence: 99%

“…In practice, ALE velocity may be constructed solving the following problem: for t > 0 and v h fluid velocity,−∆ w h = 0 in Ω h , w h = v h • ν h k h • ν h k h on ∂Ω h ,(3.5)where k h : ∂Ω h → R d is some user defined vector and depends on the physics of the problem.The trivial choice of k h is k h = v h which, formally, yields w h = v h on ∂Ω h . This is a very common choice for simulating the kinematics of droplets with FEM (see, e.g.,[22,20,21]). In this paper, we use implicit discretization in time for the domain evolution.…”

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confidence: 99%

Energy stable finite element scheme for simulating flow dynamics of droplets on non-homogeneous surfaces

Ivančić¹,

Solovchuk²

2022

Preprint

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An energy stable finite element scheme within arbitrary Lagrangian Eulerian (ALE) framework is derived for simulating the dynamics of millimetric droplets in contact with solid surfaces. Supporting surfaces considered may exhibit non-homogeneous properties which are incorporated into system through generalized Navier boundary conditions (GNBC). Numerical scheme is constructed such that the counterpart of (continuous) energy balance holds on the discrete level. This ensures that no spurious energy is introduced into the discrete system, i.e. the discrete formulation is stable in the energy norm. The newly proposed scheme is numerically validated to confirm the theoretical predictions. Of a particular interest is the case of droplet on a non-homogeneous inclined surface. This case shows the capabilities of the scheme to capture the complex droplet dynamics (sliding and rolling) while maintaining stability during the long time simulation.

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Application of artificial neural network (ANN) and response surface methodology (RSM) for modeling and optimization of the contact angle of rice leaf surfaces

et al. 2020

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Effects of temperature-dependent contact angle on the flow dynamics of an impinging droplet on a hot solid substrate

Cited by 13 publications

References 35 publications

Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

Energy stable finite element scheme for simulating flow dynamics of droplets on non-homogeneous surfaces

Application of artificial neural network (ANN) and response surface methodology (RSM) for modeling and optimization of the contact angle of rice leaf surfaces

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