The effect of the volume fraction of dispersed phase on toughness of injection molded polypropylene blended with SEBS, SEPS, and SEP

2005 ◽  
Vol 45 (12) ◽  
pp. 1630-1638 ◽  
Author(s):  
Yushi Matsuda ◽  
Masao Hara ◽  
Tsuyoshi Mano ◽  
Kenzo Okamoto ◽  
Masaru Ishikawa
Keyword(s):  
Volume Fraction ◽  
Dispersed Phase ◽  
Injection Molded

The Role of Excess Attractive Particles in the Elasticity of High Internal Phase Pickering Emulsions

Soft Matter ◽  
2021 ◽  
Author(s):  
Junsu Chae ◽  
Siyoung Choi ◽  
KyuHan Kim
Keyword(s):  
Volume Fraction ◽  
Dispersed Phase ◽  
Pickering Emulsions ◽  
High Internal Phase Emulsion ◽  
Internal Phase

A high internal phase emulsion (HIPE), which has a volume fraction of dispersed phase of over 74%, shows a solid like property because of concentrated polyhedral droplets. Although many studies...

Study on Propylene Recovery in a Dispersed Absorption System-(Water-in-Oil) Emulsion System

2011 ◽  
Vol 383-390 ◽  
pp. 6151-6155
Author(s):  
Hong Jing Liu ◽  
Ying Zhang ◽  
Hui Yao ◽  
Wei Zhao
Keyword(s):  
Droplet Size ◽  
Absorption Rate ◽  
Volume Fraction ◽  
Dispersed Phase ◽  
Emulsion System ◽  
Absorption System ◽  
Oil Emulsion ◽  
Stirring Rate ◽  
Water In Oil Emulsion ◽  
System Water

The purpose of the paper is to investigate propylene recovery by a new absorption system, namely water-in-oil emulsion absorbent. Water in oil emulsion, in which kerosene used as oil phase with dispersed water droplet, is prepared to be as absorbent to absorb propylene. The effect of volume fraction dispersed phase, dispersed droplet size, and the stirring rate on propylene absorption rate are researched. Experimental results indicate that the absorption rate of propylene can increase 20% compared with traditional absorption method. The volume fraction dispersed phase should be appropriate, otherwise the enhancement absorption can not be attained. The appropriate number is 0.05 for this dispersion. The smaller droplet size of dispersed phase as well as the faster stirring rate can increase the propylene absorption rate. The mechanism of enhancement propylene absorption is attributed to the intensive turbulence in boundary layer between gas and liquid due to the movement of dispersed water droplets.

Mechanical and Structural Properties of Maltodextrin/Agarose Gel Composites

2006 ◽  
Vol 16 (5) ◽  
pp. 248-257 ◽  
Author(s):  
Chrystel Loret ◽  
William J. Frith ◽  
Peter J. Fryer
Keyword(s):  
Mechanical Properties ◽  
Phase Separation ◽  
Confocal Microscopy ◽  
Large Deformation ◽  
Mechanical Behaviour ◽  
Composite Structure ◽  
Volume Fraction ◽  
Dispersed Phase ◽  
Agarose Gel ◽  
Mechanical And Structural Properties

Abstract When two biopolymers are mixed together, they will normally phase separate to give two distinct phases. If the biopolymers are gelled during this phase separation, for instance by reducing the temperature, one phase is trapped in this other one and an emulsion-like composite structure is obtained. In this study, we investigated the effect of volume fraction and droplet size of this dispersed phase on the mechanical properties of maltodextrin/agarose gel composites, where agarose is the dispersed phase. Mechanical properties of the different composites were investigated under large deformation using a rheometer with a vane geometry. These composites were also observed by confocal microscopy, allowing conclusions to be drawn regarding the microstructural origins of the observed mechanical behaviour.

Prediction of Frictional Pressure Gradient in Horizontal Oil/Water Dispersion Flow

SPE Journal ◽  
2010 ◽  
Vol 16 (01) ◽  
pp. 148-154 ◽  
Author(s):  
Jany Carolina Vielma ◽  
Ovadia Shoham ◽  
Ram S. Mohan ◽  
Luis E. Gomez
Keyword(s):  
Pressure Gradient ◽  
Volume Fraction ◽  
Average Error ◽  
Dispersed Phase ◽  
Phase Volume ◽  
Water Dispersion ◽  
Phase Volume Fraction ◽  
Law Of The Wall ◽  
Oil Water ◽  
The Law

Summary A novel model has been developed for the prediction of frictional pressure gradient in unstable turbulent oil/water dispersion flow in horizontal pipes. This model uses the friction-factor approach, based on the law of the wall, to predict the pressure gradient. Modification of both the von Karman coefficient κ' and the parameter B' have been carried out in the law of the wall to include the effect of the dispersed phase—namely, the dispersed-phase volume fraction and the characteristic-droplet-size diameters. The developed model applies to both dilute and dense flows, covering the entire range of water cuts. Model predictions have been compared with a comprehensive experimental database collected from literature, resulting in an absolute average error of 9.6%. Also, the comparisons demonstrate that the developed model properly represents the physical phenomena exhibited in unstable turbulent oil/water dispersions. These include drag reduction, increase in frictional pressure gradient with increasing dispersed-phase volume fraction, and the peak in the frictional pressure gradient at the oil/water phase-inversion region.

scholarly journals Study of the conservation properties in two-way coupled dispersed multiphase flows using finite volume methods

2021 ◽  
Vol 2116 (1) ◽  
pp. 012071
Author(s):  
Linda Bahramian ◽  
Jordi Muela ◽  
C David Pérez-Segarra
Keyword(s):  
Carrier Phase ◽  
Multiphase Flows ◽  
Volume Fraction ◽  
Finite Volume Methods ◽  
Dispersed Phase ◽  
Volume Fractions ◽  
Large Eddy ◽  
Discrete Operators ◽  
Dispersed Phases ◽  
Dispersed Flows

Abstract In order to simulate dispersed multiphase flows, the coupling level must be determined according to the volume fraction in the system. The volume fraction is the ratio of the total volume of the dispersed phases over the total volume of the flow. In dilute flows, with volume fractions smaller than 10-6, only the influence of carrier phase over the dispersed phase is considered which is known as one-way coupling. Nonetheless, in dispersed flows with higher volume fractions, the effect of the dispersed phase over the continuous one should be taken into consideration, known as two-way coupling. This effect normally is applied as a source term in the conservation equations of the carrier phase. Depending on the numerical method and the discrete operators employed, these source terms can lead to some issues when aiming to preserve physical properties like mass, momentum and energy. Moreover, in order to validate the two-way coupling method, a particle-laden turbulent flow benchmark case with a mass loading of 22% is simulated by means of large eddy numerical simulation (LES). The aim of this work is to study the conservation properties of dispersed multiphase flows like momentum, kinetic energy and thermal energy through two-way coupling between dispersed and continuous phases.

The orientation of the dispersed phase and crystals in an injection-molded impact polypropylene copolymer

2020 ◽  
Vol 90 ◽  
pp. 106658 ◽  
Author(s):  
Xuanbo Liu ◽  
Xiaopei Miao ◽  
Xiaoguang Cai ◽  
Jingbo Shao ◽  
Fasheng Zou ◽  
...  
Keyword(s):  
Dispersed Phase ◽  
Impact Polypropylene Copolymer ◽  
Injection Molded

Effect of Processing Conditions on Microstructure of SiC-TiB2 Composite

2013 ◽  
Vol 197 ◽  
pp. 250-255
Author(s):  
Gabriela Górny ◽  
Ludosław Stobierski ◽  
Paweł Rutkowski ◽  
Marian Rączka
Keyword(s):  
Volume Fraction ◽  
Particulate Composite ◽  
Dispersed Phase ◽  
Processing Conditions ◽  
Pressing Method ◽  
Microstructural Parameters ◽  
Grinding Media ◽  
Average Size ◽  
Tib2 Particles ◽  
Volumetric Content

The objective of the study as described in this paper is to analyse the effect of processing conditions as: volumetric content of TiB2 powders and the time of milling them on the parameters of microstructure of particulate composite with a SiC matrix and 10 or 20 vol.% of the TiB2 as dispersed phase. From the initial research conducted by the authors, as well as from the data contained in the reference literature, it is known that the SiC-TiB2 composite is a potential material to be applied in the manufacture of cutting tool inserts. To manufacture composites, SiC powders (Starck, UF-15) and TiB2 powders (Momentive, HCT-30) were used; they were milled for 15 or 30 h in a vibrating-rotating mill with silicon carbide balls as grinding media. The SiC-TiB2 composite was manufactured using a hot pressing method under the following conditions: temperature: 2120 oC; pressure: 25 MPa; and sintering time: 30 min. Under the stereological analysis of SiC-TiB2 some selected microstructural parameters were measured, i.e.: volume fraction of TiB2, average size of TiB2 particles, mean diameter of particles (D), shape factor of TiB2 particles, α, as well as NA and NV parameters that determine the quantity of TiB2 particles contained in the composite. Computer-aided analysis of microstructure of the SiC-TiB2 composites and analysis of results of measurements of mechanical properties of these composites prove their the microstructure and properties depend on the volumetric content of TiB2 dispersed phase, and this dependence is significant.

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