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

Physics of Fluids, Volume 0, Issue ja, -Not available-. We report a numerical study of the contact-line effect on the Faraday instability. A momentum balance model is implemented to simulate the hysteresis of the meniscus. By using this model, a stick-slip-motion of the contact line happens on the lateral wall when a vertical vibration is… Continue reading Numerical study of the impact of contact line with hysteresis on the Faraday instability

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Numerical study of the cross vapor stream effect on falling film hydrodynamics over a horizontal tube

Physics of Fluids, Volume 0, Issue ja, -Not available-. Falling film technology has been widely applied in various industrial processes, but vapor shearing effects cause significant problems. The mechanism by which vapor affects the hydrodynamics of a falling film has not yet been fully understood, particularly for cross vapor streams. In this paper, a three-dimensional… Continue reading Numerical study of the cross vapor stream effect on falling film hydrodynamics over a horizontal tube

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On the Role Played by Extensional Viscosity in Peristaltic Transport of Circular Solid Particles Suspended in Oldroyd-B Liquids

Physics of Fluids, Volume 0, Issue ja, -Not available-. <p>Efficiency of peristalsis mechanism is numerically investigated for the transport of circular solid particles suspended in viscoelastic liquids obeying the Oldroyd-B model. Having modeled the solid particle as a viscoplastic droplet obeying the bi-viscous model, we have relied on the finite-element method for solving the equations… Continue reading On the Role Played by Extensional Viscosity in Peristaltic Transport of Circular Solid Particles Suspended in Oldroyd-B Liquids

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Precession resonance of Rossby wave triads and the generation of low frequency atmospheric oscillations

Physics of Fluids, Volume 0, Issue ja, -Not available-. The dynamics of the Earth’s atmosphere is characterized by a wide spectrum of oscillations, ranging from hourly to interdecadal and beyond. The low frequency component of the atmospheric variability cannot be understood solely in terms of linear atmospheric waves that have shorter timescales. A newly proposed… Continue reading Precession resonance of Rossby wave triads and the generation of low frequency atmospheric oscillations

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A generalized framework for unsupervised learning and data recovery in computational fluid dynamics using discretized loss functions

Physics of Fluids, Volume 0, Issue ja, -Not available-. The authors present generalized finite-volume-based discretized loss functions integrated into pressure-linked algorithms for physics-based unsupervised training of neural networks (NNs). In contrast to automatic differentiation-based counterparts, discretized loss functions leverage well-developed numerical schemes of computational fluid dynamics (CFD) for tailoring NN training specific to the flow… Continue reading A generalized framework for unsupervised learning and data recovery in computational fluid dynamics using discretized loss functions

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Contribution of initial bubble radius distribution to weakly nonlinear waves with a long wavelength in bubbly liquids

Physics of Fluids, Volume 0, Issue ja, -Not available-. In this study, the weakly nonlinear propagation of plane progressive pressure waves in an initially quiescent liquid was theoretically investigated. This liquid contains several small uniformly distributed spherical polydisperse gas bubbles. The polydispersity considered here represents various types of initial bubble radii, and the liquid contains… Continue reading Contribution of initial bubble radius distribution to weakly nonlinear waves with a long wavelength in bubbly liquids

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The ω3 scaling of the vibrational density of states in quasi-2D nanoconfined solids

Experimental evidence Using inelastic neutron scattering, we have measured the VDOS of water at 120 K (solid state) softly confined47 between graphene oxide membranes (GOM) with different levels of hydration. The detailed information on the sample preparation, the experimental methods and the data analysis are provided in the Methods. As a reference, in Fig. 2a, we… Continue reading The ω3 scaling of the vibrational density of states in quasi-2D nanoconfined solids

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Attosecond-scale measurement of Wigner time delay in molecular photoionization

Schematic diagram of the “double-pointer attoclock” scheme for measuring the time-resolved electron dynamics of asymmetrical co molecule. Credit: Ultrafast Science The photoelectric effect is one of the most fundamental light-matter interactions, which is widely used in probing ultrafast dynamics in atoms, molecules and condensed matters. It has been in the research spotlight for more than… Continue reading Attosecond-scale measurement of Wigner time delay in molecular photoionization

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Light traveling in a distorting medium can appear undistorted

An artistic impression of complex vectorial light passing through some distorting complex media and becoming altered in some way. The pattern of the light depicts the polarization state. The complex media shown in the insets includes living tissue, under-water, optical fiber and transmission through the atmosphere. Credit: Wits University A team led by researchers at… Continue reading Light traveling in a distorting medium can appear undistorted

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The remarkable journey of a powerhouse space microscope

In the International Space Station’s Destiny laboratory, NASA astronaut Dan Burbank, Expedition 30 commander, conducts a session with the Preliminary Advanced Colloids Experiment (PACE) at the Light Microscopy Module (LMM) in the Fluids Integrated Rack / Fluids Combustion Facility (FIR/FCF). PACE is designed to investigate the capability of conducting high magnification colloid experiments with the… Continue reading The remarkable journey of a powerhouse space microscope

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