Numerical modeling of turbulence-induced interfacial instability in two-phase flow with moving interface

Balabel, Ashraf

doi:10.1016/j.apm.2011.11.006

Cited by 8 publications

(4 citation statements)

References 61 publications

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“…Although there is no turbulence treatment capable of properly capturing the effects of the turbulence on the gas-liquid interface, the smearing effect introduced by the species-based solver as well as the lacking of a reconstruction algorithm makes this combination applicable. Additionally, the jet injected is not subjected to a complete atomization regime, but to the first/second wind induced breakup, which implies that the effect of the turbulent behavior will not affect significantly the interface [22]. The corresponding data has been extracted once the case has converged to steady solution.…”

Section: Methodsmentioning

confidence: 99%

Mixture Model Approach for the Study of the Inner Flow Dynamics of an AdBlue Dosing System and the Characterization of the Near-Field Spray

Payri

Martí-Aldaraví

Marco-Gimeno

2021

SAE Technical Paper Series

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Selective Catalytic Reduction stands for an effective methodology for the reduction of NOx emissions from Diesel engines and meeting current and future EURO standards. For it, the injection of Urea Water Solution (UWS) plays a major role in the process of reducing the NOx emissions. A LES approach for turbulence modelling allows to have a description of the physics which is a very useful tool in situations where experiments cannot be performed. The main objective of this study is to predict characteristics of the flow of interest inside the injector as well as spray morphology in the near field of the spray. For it, the nozzle geometry has been reconstructed from X-Ray tomography data, and an Eulerian-Eulerian approach commonly known as Mixture Model has been applied to study the liquid phase of the UWS with a LES approach for turbulence modeling. The injector unit is subjected to typical low-pressure working conditions. The results extracted from it comprise parameters that characterize the hydraulic behavior as well as jet intact length. The conclusions drawn from the model depict differences in the flow behavior between the injector three orifices, with an under-prediction of nozzle and spray characteristics of LES formulation with respect to traditional RANS turbulence treatment.

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Section: Methodsmentioning

confidence: 99%

Mixture Model Approach for the Study of the Inner Flow Dynamics of an AdBlue Dosing System and the Characterization of the Near-Field Spray

Payri

Martí-Aldaraví

Marco-Gimeno

2021

SAE Technical Paper Series

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“…Since the heating problem considered is associated with the laser interaction of metallic substrate (figure (1)), the output power intensity distribution at the workpiece remains important. In this case, it is assumed to be a Gaussian and its spot centre is at the centre of the co-ordinate system is considered (figure (1)). This arrangement results in an axisymmetric heating of the substrate material.…”

Section: Figure 1 Schematic Of An Axi-symmetric Laser Melting Processmentioning

confidence: 99%

“…Considerable research studies were carried out to examine phase change problem and the interfacial conditions. The turbulenceinduced interfacial instability in two-phase flow with moving interface was studied by Balabel [1]. He introduced the transition from one phase to another through incorporating a consistent balance of kinematic and dynamic conditions on the interface separating the two phases.…”

Section: Introductionmentioning

confidence: 99%

An Approach for Interface Condition of Phase-Change Heat Conduction in Curvilinear Coordinates

Mansoor

Yilbaş

2020

Journal of Thermal Engineering

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Phase change materials are vastly used in thermal engineering applications. The model studies reduce the experimental time and cost and gives insight into the physical process and and provides relation between the process outcomes and the influencing parameters on the process. One of the challenges in the model study related to the phase change problem is setting the appropriate boundary conditions across the phases. This is because of the fictitious definition of the mush zone across the phases. This situation becomes complicated when setting the boundary conditions across the odd geometric shapes. In this study, mathematical formulation of the condition for energy-balance at the interface of the phase changing is investigated using the curvilinear coordinate system without requiring the coordinate system. The proposed arrangement enables to create a curvilinear system via transformation equations from another curvilinear coordinate system. It also provides mathematical formulation of the interfacial boundary conditions across the phases.

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“…Higher harmonics can also be seen in the velocity and pressure profiles revealing the well prediction of flow-acoustics interaction. In our previous work [25] and [26], the validation of our developed numerical scheme has been carried out by performing a number of two-dimensional validation test cases concerning laminar and turbulent two-phase flow with different interfacial stresses. In such context, the accuracy of the presented developed algorithms has been estimated and proved.…”

Section: Validationmentioning

confidence: 99%

Numerical simulation of droplet coalescence in turbulent stream using level set method

Balabel¹

2013

IJEM

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In the present paper a novel numerical method for solving the problem of two-phase flow with moving interfaces in both laminar and turbulent flow regimes is developed. The developed numerical method is based on the solution of the Reynolds-Averaged Navier Stokes equations in both phases separately with appropriate boundary conditions located at the interface separating the two fluids. The solution algorithm is performed on a regular and structured two-dimensional computational grid using the control volume approach. The complex shapes as well as the geometrical quantities of the interface are determined via the level set method. The numerical method is firstly validated against the prediction of the well known flow dynamics over a circular cylinder. Further, the numerical simulation of two colliding droplets in gas flow is numerically predicted showing the important dynamics associated with the different flow regimes considered. The remarkable capability of the developed numerical method in predicting turbulent two-phase flow dynamics enables us to predict further a wide range of two-phase flow industrial and engineering applications.

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Numerical modeling of turbulence-induced interfacial instability in two-phase flow with moving interface

Cited by 8 publications

References 61 publications

Mixture Model Approach for the Study of the Inner Flow Dynamics of an AdBlue Dosing System and the Characterization of the Near-Field Spray

Mixture Model Approach for the Study of the Inner Flow Dynamics of an AdBlue Dosing System and the Characterization of the Near-Field Spray

An Approach for Interface Condition of Phase-Change Heat Conduction in Curvilinear Coordinates

Numerical simulation of droplet coalescence in turbulent stream using level set method

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