Simulation of viscoelastic fluid flows in expansion geometry using finite volume approach

Azizi, Mohammad; Ramazani, S A Ahmad; Etemadi, Majed; Shirzaei, S. Ehsan

doi:10.1007/s10118-013-1336-2

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…Since the last decades, polymer blends and composites have been used in different applications due to their significant electrical, mechanical, the rmal, and biodegradation properties. The modification of polymers and composites has led to multiple applications, such as biomedical, energy storage, medical packaging, and food packaging [1][2][3][4][5][6][7][8][9][10][11]. Numerous studies in polymer blending have been conducted with inorganic polymers in which they remain non-degradable in landfills for centuries.…”

Section: Introductionmentioning

confidence: 99%

The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites

Azizi

Sabetzadeh

2019

J. Compos. Sci.

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Polypropylene/polylactic acid (PP/PLA) blend (10–40% of PLA) and PP/PLA/MWCNTs nanocomposites (0.5, 1, and 2 wt% of MWCNTs) were prepared via melt compounding. Scanning electron microscopy revealed a co-continuous PLA phase in the PP/PLA blends with high PLA content. Moreover, the addition of 2 wt% multi-walled carbon nanotubes (MWCNTs) increased the tensile modulus and tensile strength of the PP/PLA40% by 60% and 95%, respectively. A conductive network was found with the addition of 2 wt% MWCNTs, where the electrical conductivity of the PP/PLA increased by nine orders of magnitude. At 2 wt% MWCNTs, a solid network within the composite was characterized by rheological assessment, where the composite turned from nonterminal to terminal behavior. Soil burial testing of the PP/PLA blend within 30 days in natural humus compost soil featured suitable biodegradation, which indicates the PP/PLA blend is as an appropriate candidate for food packing applications.

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Section: Introductionmentioning

confidence: 99%

The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites

Azizi

Sabetzadeh

2019

J. Compos. Sci.

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“…Thus, it is relevant to study the effect of several carbonaceous nanofillers with different shapes and physical properties. Moreover, the 3 fabrication method and the incorporation of functionalizing or compatibilizer agents can play a dominant role in determining the properties of the fabricated composite [18]. Therefore, in this study, more or less spherical and highly conductive CB filler has been selected as reference filler for comparison with a commercially available graphene.…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal conductivity of ethylene vinyl acetate composite with graphene and carbon black filler

et al. 2018

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Ethylene vinyl acetate (EVA) composites, including two different carbonaceous conductive fillers, carbon black (CB) and commercially available graphene (G), were fabricated by solventcasting and melt compounding methods. The effect of additives and process conditions on electrical and thermal properties of composites was investigated. The dielectric responses of EVA composites were characterized by a percolation threshold of 15 wt % for EVA/G prepared by solvent-casting. However, as the EVA/G15% was also subsequently extruded, the applied shear stress induced by extrusion caused deterioration of the electrical network and reduced the composite's electrical conductivity. A percolating network was found for the EVA composites containing CB at around 5-7 wt % with 10 orders of magnitude increase in electrical conductivity with respect to the neat EVA. The thermal conductivity of EVA/CB7% and EVA/G15% increased 16 and 22 % respectively, in comparison to the neat EVA. Both additives increased the electrical and thermal conductivity of composites to be appropriate as jackets for high-voltage cables.

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“…Droplets used in microfluidic devices are complex fluids in many cases and are often described as non‐Newtonian viscoelastic fluids, such as bodily fluids, DNA samples, and proteins. These fluids can be challenging to analyze and have complicated and unexpected rheological responses . The migration of viscoelastic droplets needs to be understood in detail, but relevant studies are extremely scarce.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on viscoelastic droplet migration on a solid substrate due to wettability gradient

Bai

Zhang³

et al. 2019

Electrophoresis

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This study investigates the viscoelastic effects on droplet migration induced by a wettability gradient on a rigid substrate by a numerical simulation based on OpenFOAM with the volume‐of‐fluid method. The droplets are set with different rheological properties to investigate the effect of the elastic parameters. The Oldroyd‐B model was employed. Quantitative differences in the migration and deformation between Newtonian and viscoelastic droplets were investigated by changing the degree of elasticity. The droplet migration shows conspicuously higher mobility for high elasticity, especially during the accelerating period. Moreover, the displacement and velocity increased with the decrease of a viscoelasticity parameter, and the velocity enhancement was regulated by the elastic instability shown at a high Weissenberg number. In addition, the velocity of the droplet changes more significantly over the range of contact angles of 130° to 60° compared to other wettability‐gradient surfaces.

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Simulation of viscoelastic fluid flows in expansion geometry using finite volume approach

Cited by 5 publications

References 28 publications

The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites

The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites

Electrical and thermal conductivity of ethylene vinyl acetate composite with graphene and carbon black filler

A numerical study on viscoelastic droplet migration on a solid substrate due to wettability gradient

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