Numerical study of the impact of contact line with hysteresis on the Faraday instability

Li, Jing; Li, Xiaochen

doi:10.1063/5.0101956

Cited by 7 publications

(2 citation statements)

References 61 publications

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“…15,16 The origin of CAH lies in the microscopic phenomena at the molecular level, but its effect is observed at the macroscopic level. [17][18][19] It is a challenging task to model the moving the contact line, dynamic contact angle, and CAH at the three-phase contact line. It has been extensively studied in the past few decades and still an ongoing area of research.…”

Section: Introductionmentioning

confidence: 99%

“…It has been extensively studied in the past few decades and still an ongoing area of research. [17][18][19][20][21][22] Neglecting the CAH in the free surface problems near a solid surface is an oversimplification, and it may lead to wrong predictions. 6,23 In the case of the presence of CAH, the contact angle for a given system can exhibit a range of steady-state values.…”

Section: Introductionmentioning

confidence: 99%

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Contact angle hysteresis can modulate the Newtonian rod-climbing effect

2022

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The present work investigates the role of contact angle hysteresis at the liquid-liquid-solid interface (LLS) on the rod climbing effect of two immiscible Newtonian liquids using experimental and numerical approaches. Experiments revealed that the final steady state contact angle, θw at the LLS interface varies with the rod rotation speed, ω. For the present system, θw changes from ∼69◦ to ∼83◦ when the state of the rod is changed from static condition to rotating at 3.3 Hz. With further increase in ω, the θw exceeds 90◦ which cannot be observed experimentally. It is inferred from the simulations that the input value of θw saturates and attains a constant value of ∼120◦ for ω > 5 Hz. Using numerical simulations, we demonstrate that this contact angle hysteresis must be considered for the correct prediction of the Newtonian rod climbing effect. Using the appropriate values of the contact angle in the boundary condition, an excellent quantitative match between the experiments and simulations is obtained in terms of- the climbing height, the threshold rod rotation speed for onset of climbing, and the shape of liquid-liquid interface. This resolves the discrepancy between the experiments and simulations in the existing literature where a constant value of the contact angle has been used for all speeds of rod rotation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contact angle hysteresis can modulate the Newtonian rod-climbing effect

2022

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Experimental investigation of three-dimensional free-surface and interfacial sloshing in a vertical cylindrical tank

Liu,

2023

Physics of Fluids

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In the present study, hundreds of experiments have been conducted on the three-dimensional free-surface and interfacial sloshing in a vertical cylindrical tank containing two immiscible liquids. The bounds of different free-surface and interfacial wave regimes are determined by maintaining fixed excitation amplitude and slowly increasing excitation frequency until another type of wave regime began to appear. In general, three types of the free-surface wave regimes are observed when the excitation frequency is in the neighborhood of the lowest natural frequency of the free surface, i.e., planar gravity wave, chaotic gravity wave, and swirling gravity wave. Similarly, when the excitation frequency is near the lowest natural frequency of the internal interface, three types of interfacial wave regimes, i.e., planar gravity wave, chaotic gravity-capillary wave, and swirling gravity-capillary wave, are generated. Besides, it is worth pointing out that when the excitation frequency is near the lowest natural frequency of the internal interface as well as very close to a third of the lowest natural frequency of the free surface, large-amplitude rotating wave motion occurs at both the free surface and the internal interface. This is due to even though the excitation frequency is far away from the natural frequency of the free surface, the secondary resonance can still become dominant and lead to large-amplitude motion of the free-surface rotating wave and subsequently influences the internal interface. This paper reveals that the sloshing behaviors of two-layer liquid in the vertical cylindrical tank are much more complicated than those of single-layer liquid.

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Experimental study of viscous effects on long-duration sloshing characteristics under surge excitations

He,

Tang,

Lin

2024

Physics of Fluids

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This study aims to investigate the initial transient effects and the final steady-state sloshing characteristics under long-duration surge excitations experimentally. Liquids with different viscosity are applied in the sloshing experiments. The image recognition method is innovatively employed to accurately capture the free surface elevation in these experiments. The viscous effects are found to play a crucial role in altering the damping of the transient mode associated with its natural frequencies and the establishment of the steady-state mode related to the excitation frequency. The mechanism of viscous effects on energy dissipation and transferring is further revealed by Fast Fourier transform and wavelet transform. Then, the damping rates of liquid sloshing with different viscosities are quantitatively measured and analyzed, with reference to the early theories. It is found that with the use of the damping coefficient derived from the experimental data, we are able to describe the long-term evolution of sloshing using the potential flow theory corrected by a damping term, representing the viscous effects of a particular viscous liquid. The accuracy and applicability of this approach is further discussed in this paper.

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Numerical study of the impact of contact line with hysteresis on the Faraday instability

Cited by 7 publications

References 61 publications

Contact angle hysteresis can modulate the Newtonian rod-climbing effect

Contact angle hysteresis can modulate the Newtonian rod-climbing effect

Experimental investigation of three-dimensional free-surface and interfacial sloshing in a vertical cylindrical tank

Experimental study of viscous effects on long-duration sloshing characteristics under surge excitations

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