Long waves between a subsonic gas flow-film interface flowing down an inclined plate

Zakaria, Kadry; Gamiel, Yasser

doi:10.1016/j.ijnonlinmec.2012.04.012

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…represents dimensionless pressure of the gas (see Zakaria and Gamiel [4] and Nayfeh and Hassan [2]). In order to remove the dimensions from Equation (2.28), we substitute Equations (2.11), (2.14), and (2.16) into Equation (2.28) then we use the scales (2.10) and the dimensionless version will read…”

Section: Formulation Of the Issuementioning

confidence: 99%

“…He found that the resonance effectiveness in rippling this interface could be increased due to the reduction of liquid depth while it could be decreased by air stream. The temporal stability features of a falling Newtonian liquid sheet down an inclined plane in the presence of a parallel subsonic gas flow were investigated by Zakaria and Gamiel [4]. The nonlinear dynamics of gravity-driven two-layers flow via an oblique microchannel with porous walls exposed to an external electric potential were explored in Sirwah and Assaf [5].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear instability of surface waves between viscous–liquid and subsonic‐gas layers subject to uniform oblique magnetic field

Assaf,

Hafez

2024

Z Angew Math Mech

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Nonlinear instability of surface waves between viscous–liquid and inviscid‐gas layers is discussed. The two fluids are magnetic and subjected to uniform oblique magnetic field. The gas is subsonic and the viscosity is introduced by viscous potential approximation. The evolution equations near and on the marginal state are derived by means of multiple scales technique. The stability criteria of the waves are obtained by the modulation idea. Many special cases of dispersion equation as well as solvability conditions correspond well the similar ones in the literature. Various numerical applications have been investigated to reveal the parameters effects on the system stability. Linear results show dual influences for magnetic field, sum of inclination angles and permeability ratio whereas the wavelength, gas motion, and inclination angle in the liquid tend to destabilize the flow. Nonlinear applications reveal dual role for the gas thickness, while it has a linear stable‐role. Moreover, nonlinearity shows dual roles for viscosity and liquid thickness, which have no influences according to linear theory. The investigation of stability using nonlinear theory seems more accurate to describe the (un)stable influences comparing with the linear one. The current work may be useful to give more accurate comprehension of stability process as well as to obtain the required conditions of stability by designing suitable devices, which control the model parameters.

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Section: Formulation Of the Issuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear instability of surface waves between viscous–liquid and subsonic‐gas layers subject to uniform oblique magnetic field

Assaf,

Hafez

2024

Z Angew Math Mech

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Micro-scale CFD study about the influence of operative parameters on physical mass transfer within structured packing elements

Sebastia‐Saez

Ranganathan

et al. 2014

International Journal of Greenhouse Gas Control

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In this work a VOF-based 3D numerical model is developed to study the influence of several operative parameters on the gas absorption into falling liquid films. The parameters studied are liquid phase viscosity, gas phase pressure and inlet configuration, liquid–solid contact angle and plate texture. This study aims to optimize the post-combustion CO2 capture process within structured packed columns. Liquid phase viscosity is modified via MEA (i.e. monoethanolamine) concentration. The results show that an increase in liquid viscosity reduces the diffusivity of oxygen within the liquid film thus hindering the efficiency of the process. Higher pressure carries an absorption improvement that can be attractive to be applied in industry. The simulations show that enhanced oxygen absorption rates can be achieved depending on the velocity of the gas phase and the flow configuration (i.e. co- and counter-current). Also, the importance of wetting liquid–solid contact angles (i.e. less than 90°) is highlighted. Poor liquid–solid adhesion has similar effects as surface tension in terms of diminishing the spreading of the liquid phase over the metallic plate. Finally the influence of a certain geometrical pattern in the metallic surface is also assessed

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Effects of a subsonic gas flow on the wave blocking and energy of interfacial waves with a constant vorticity

Zakaria,

Gamiel

2023

Physics of Fluids

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Negative energy waves play a significant role in hydrodynamic instabilities of flow and are involved in all kinds of instability in flows because they can withdraw energy from the flow. Effects of subsonic gas flow and vorticity on the existence of negative energy for water waves as well as the occurrence of capillary-gravity wave blocking have been studied. The existence of blocking points and variation in group velocity for different flow parameters such as the vorticity and subsonic gas factor is studied. The results are in agreement with a previous experiment [Suastika et al., “Experimental study of wave blocking,” Coastal Eng. 1, 227 (2000)]. The present study aims to deal with the combined effect of a subsonic gas flow parallel to solid boundaries and a moving liquid layer with linear velocity profile to establish the existing condition for negative energy waves and the blocking waves, especially for waves propagating in the opposite direction of the current. As a limiting case of the present model, in the absence of aerodynamic effect, it is found that the incident and reflected interfacial waves propagate inside the stability domain; this means that the transformed wave is generated at the expense of the energy of incident wave.

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Long waves between a subsonic gas flow-film interface flowing down an inclined plate

Cited by 5 publications

References 22 publications

Nonlinear instability of surface waves between viscous–liquid and subsonic‐gas layers subject to uniform oblique magnetic field

Nonlinear instability of surface waves between viscous–liquid and subsonic‐gas layers subject to uniform oblique magnetic field

Micro-scale CFD study about the influence of operative parameters on physical mass transfer within structured packing elements

Effects of a subsonic gas flow on the wave blocking and energy of interfacial waves with a constant vorticity

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