Binary collision of drops in simple shear flow at finite Reynolds numbers: Geometry and viscosity ratio effects

Bayareh, Morteza; Mortazavi, Saeed

doi:10.1016/j.advengsoft.2011.04.010

Cited by 35 publications

(21 citation statements)

References 22 publications

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“…1). It is well known that the average diameter of dispersed phases strongly depend on the viscosity ratio of the components (Bayareh and Mortazavi, 2011;Canto, 2014;Fililppone et al, 2007;Guido, 2011;Lemenand et al, 2013), hence SEBS-g-MA coarse the dispersed phases in cases of certain compositions, escpecially from 80 to 90 vol% PET in PET/ HDPE blends.…”

Section: Morphology After Injection Moldingmentioning

confidence: 98%

Effects of SEBS-g-MA on Rheology, Morphology and Mechanical Properties of PET/HDPE Blends

Dobrovszky

Ronkay

2015

International Polymer Processing

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Abstract:The effects of additive styrene/ethylene-butylene/styrene copolymer grafted with maleic anhydride (SEBS-g-MA) were investigated on the rheology, morphology and mechanical properties of a polyethylene terephthalate (PET) / high density polyethylene (HDPE) blend. The ratio of the two components was changed in small increments to track phase inversion. The rheology measurements show that SEBS-g-MA acts differently on HDPE and PET, as different morphologies are formed due to viscosity ratio change. With the help of electron microscopy various phases after extrusion and after injection moulding were revealed and identified. Because of the high viscosity of HDPE the cocontinuous morphology was immediately formed when PET reached 30 vol%. The range of the cocontinuous structure of the blend was wider when SEBS-g-MA was added, and the elongation at break also improved as additive content increased, without a significant strength decrease. The divergence of the mechanical properties from the theoretical value, i.e. the value determined by the mixing rule, can be explained by the changing phase structure.

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Section: Morphology After Injection Moldingmentioning

confidence: 98%

Effects of SEBS-g-MA on Rheology, Morphology and Mechanical Properties of PET/HDPE Blends

Dobrovszky

Ronkay

2015

International Polymer Processing

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“…Bayareh and Mortazavi [8,11], made a detailed convergence study of a drop motion and the interaction between two drops. For other validation tests, see Unverdi and Tryggvason [12] and Tryggvason et al [13].…”

Section: Methodsmentioning

confidence: 99%

“…Bayareh and Mortazavi [8][9][10][11] studied the motion of a single drop and the interaction between two drops in Couette flow at finite Reynolds numbers neglecting the gravity influence. They showed that the drops migrate to the centerline of the channel in shear flow.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Position of a Buoyant Drop in Couette and Poiseuille Flows at Finite Reynolds Numbers

Bayareh

Mortazavi

2012

J. mech.

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The equilibrium position of a deformable drop in Couette and Poiseuille flows is investigated numerically by solving the full Navier-Stokes equations using a finite difference/front tracking method. The objective of this work is to study the motion of a non-neutrally buoyant drop in Couette and Poiseuille flows with different density ratios at finite Reynolds numbers. Couette flow: The equilibrium position of the lighter drops is higher than the heavier drops at each particle Reynolds number. Also, the equilibrium position height increases with increasing the Reynolds number at a fixed density ratio. At this equilibrium distance from the wall, the migration velocity is zero, while the velocity of the drop in the flow direction and rotational velocity of the drop is finite. It is observed that the equilibrium position is independent of the initial position of the drops and depends on the density ratio and the shear Reynolds number. Poiseuille flow: When the drop is slightly buoyant, it moves to an equilibrium position between the wall and the centerline. The equilibrium position is close to the centerline if the drop lags the fluid but close to the wall if the drop leads the fluid. As the Reynolds number increases, the equilibrium position of lighter drops moves slightly closer to the wall and the equilibrium position of heavier drops moves towards the centerline.

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“…Hence, the most important point in this problem is to model free surface. Since the specification of the free surface is not readily possible in mesh-based methods, various techniques such as Volume-of-Fluid (VOF) [1][2], front-tracking [3][4][5][6][7][8] and Level Set (LS) are employed for tracking the free surface. If the profile of the free surface significantly changes, the structure of mesh network is completely destroyed.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Sand Particles Flow Using a Weakly Compressible Smoothed Particle Hydrodynamics Method (WCSPH)

Bayareh¹,

Nourbakhsh²,

Rouzbahani³

et al. 2019

ACSM

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In the present study, sand behavior on the transformation of sandy beaches is simulated by a Lagrangian approach using a solver based on smooth particle hydrodynamics (SPH) method. There are interpolation points that are assumed as fluid particles with arbitrary distribution. These particles carry mass, velocity, density, and other material properties depending on the given problem. The multi-phase flows can be modeled by SPH and each particle is assigned to a different phase. The WCSPH method is used to solve Newtonian and non-Newtonian fluid flow which causes smaller computation power in comparison with the fluid dynamics. The present method is validated by solving a dam break, submerged hatch and sedimentation problems. In addition, the computational results are evaluated with the experimental and numerical data. The formation of bed ripples in sandy beaches is investigated in details and an intended model is accomplished.

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Binary collision of drops in simple shear flow at finite Reynolds numbers: Geometry and viscosity ratio effects

Cited by 35 publications

References 22 publications

Effects of SEBS-g-MA on Rheology, Morphology and Mechanical Properties of PET/HDPE Blends

Effects of SEBS-g-MA on Rheology, Morphology and Mechanical Properties of PET/HDPE Blends

Equilibrium Position of a Buoyant Drop in Couette and Poiseuille Flows at Finite Reynolds Numbers

Simulation of Sand Particles Flow Using a Weakly Compressible Smoothed Particle Hydrodynamics Method (WCSPH)

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