A5067744189- Rheology and Fluid Dynamics Studies
- Composite Material Mechanics
- Injection Molding Process and Properties
- Polymer crystallization and properties
- Polymer Foaming and Composites
- Mechanical Behavior of Composites
- Epoxy Resin Curing Processes
- Additive Manufacturing and 3D Printing Technologies
- Lattice Boltzmann Simulation Studies
- Carbon Nanotubes in Composites
- Fluid Dynamics and Thin Films
- Material Properties and Processing
- Fiber-reinforced polymer composites
- Process Optimization and Integration
- Advanced Control Systems Optimization
- biodegradable polymer synthesis and properties
- Advanced Cellulose Research Studies
- Numerical methods in engineering
- Fluid Dynamics and Mixing
- Granular flow and fluidized beds
- Polymer Nanocomposites and Properties
- Natural Fiber Reinforced Composites
- Fluid Dynamics Simulations and Interactions
- Advanced machining processes and optimization
- Innovations in Concrete and Construction Materials
Western University
2016-2025
Karlsruhe Institute of Technology
2019-2021
General Motors (United States)
2021
Fraunhofer Institute for Chemical Technology
2019-2021
McMaster University
2005-2020
University of Waterloo
2016
Technical University of Denmark
2008
Massachusetts Institute of Technology
2004
Carnegie Mellon University
1985-1986
Abstract This paper describes a 25‐year project in which we defined problem solving, identified effective methods for developing students' skill implemented series of four required courses to develop the skill, and evaluated effectiveness program. Four research projects are summarized teaching failed solving were successful skills. We found that students need both comprehension Chemical Engineering what call general solve problems successfully. 37 use 120 hours workshops spread over Each is...
Abstract Flow rate measurements in a steady‐state process are reconciled by weighted least squares so that the conservation laws obeyed. A projection matrix is constructed which can be used to decompose linear problem into solution of two subproblems, first removing each balance around units with an unmeasured component flow rate. The remaining measured rates reconciled, and then obtained from equations. basic case contains constraints total rates. method extended cases bilinear constraints,...
Abstract Fountain flow is the phenomenon of deceleration and outward motion fluid particles as they approach a slower moving interface. The use general purpose finite element program for appropriate boundary conditions made possible detailed description behind an advancing liquid front at constant speed inside two‐dimensional channels tubes. results were qualitatively same both Newtonian shear‐thinning fluids.
ABSTRACT The electrical conductivity and percolation threshold of single hybrid carbon filled composites are experimentally investigated. Polystyrene, fiber (CF) black (CB) at three CF/CB ratios 1.67, 3.33, 6.67 were compounded in a twin screw extruder micro‐compounder compression molded into sheets. through‐plane in‐plane the measured by 2 4 probe techniques. filler determined from experimental results using model. have higher value lower than CF composite except for ratio 6.67. cases...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation H. Mavridis, A. N. Hrymak, J. Vlachopoulos; The Effect of Fountain Flow on Molecular Orientation in Injection Molding. Journal Rheology 1 August 1988; 32 (6): 639–663. https://doi.org/10.1122/1.549984 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex...
This study investigated an anomalous frequency shift observed in collected spectra from inline monitoring system based on guided ultrasonic waves, with the changing flow rate of extrusion compounding process for fiber-reinforced thermoplastics. Three possible parameters to explain peak shifting, namely melt temperature, velocity, and fiber length were evaluated. The unlikely potential a doppler moment due was readily dismissed analysis since fluid through die too slow while resonance...
Abstract The objective of this work is to validate, via comparison with available experimental data, the results obtained from numerical simulation polymer melt flow in kneading disc section an intermeshing co‐rotating twin screw extruder. A quasi‐steady state 3‐D solution conservation equations finite element method was obtained, and comparisons were made pressure profiles measured by McCullough Hilton (1) on various block elements. These measurements helped provide understanding patterns...
Abstract Poly( N ‐vinylformamide) (PNVF) was synthesized and hydrolyzed to poly(vinylamine) (PVAm) in both HCl NaOH solutions. The hydrolysis kinetics the equilibrium were examined experimentally at different temperatures, polymer concentrations, acid‐ or base‐to‐amide molar ratios. strongly depended on temperature, polymer, but showed little dependence PNVF molecular weight. acid of exhibited limited conversions because electrostatic repulsion among cationic amine groups generated during...
Abstract Free‐radical reactions, which are relevant in the chemical modification of polymeric materials, discussed relationship to their influence on random chain scission. A mathematical model is developed calculate entire molecular weight distribution (MWD) with degree scission as sole parameter. This expression identical one derived by Saito for case initiated irradiation. An variation averages and compared those calculated methods moments found literature. The validity empirical closure...
The flow field created by two impinging liquid jets in a cylindrical chamber is investigated using particle tracing, laser Doppler anemometry, and three-dimensional numerical simulation. jet Reynolds number (based on the mean velocity diameter) range from 50–300. Results show that there threshold value of beyond which exhibits oscillations. Computer simulations agree well with experimental visualizations, for both overall observed pattern quantitative measure
Abstract Flow‐induced orientation of the conductive fillers in injection molding creates parts with anisotropic electrical conductivity where through‐plane is several orders magnitude lower than in‐plane conductivity. This article provides insight into a novel processing method using chemical blowing agent to manipulate carbon fiber (CF) within polymer matrix during molding. The study used fractional factorial experimental design identify important factors for improving plates molded from...
Abstract A three‐dimensional finite element model was implemented for the solution of mass and momentum conservation equations in kneading disc section an intermeshing co‐rotating twin‐screw extruder. The polymer melt modeled with a Carreau constitutive equation. particle tracking technique used to obtain residence times analyze distributive mixing different length diameter ratios ( L / D ) discs. Previous studies from Kalyon et al. (1) Cheng Manas‐Zloczower (2) have shown that performance...
Abstract The analysis of stratified multiphase flow fields is difficult because the position interface unknown a priori and there discontinuity in normal viscous stress and/or pressure at interface. A finite‐element technique that uses double nodes along has been implemented. immiscible liquid displacement capillary tube was examined detail. Fountain advancing fluid, reverse fountain receding recirculating region less fluid were determined. In Newtonian flat film coextrusion entry region,...
A microinjection moulding machine was used to obtain micromouldings of polyoxymethylene, in order study morphology development during the process. The method design experiments investigate statistically effects processing variables on microstructural features mouldings. morphological were identified by microtoming samples both transverse and longitudinal (flow) directions observing microtomed sections under a polarised light microscope. Morphology evolution along flow direction followed...
ABSTRACT A series of different carbon (carbon black, nanotubes, and graphite nanoplatelets) filled polypropylene nanocomposites were prepared by melt blending, then followed compression molding or microinjection (µIM). Direct current electrical conductivity measurements rheology tests utilized to detect the percolated structure for molded polypropylene/carbon nanocomposites. For µIM, a rectangular mold insert which has three‐step decrease in thickness along flow direction was adopted study...
Abstract Polymer‐carbon nanocomposites incorporate the exceptional properties of both polymer matrices, such as low cost and simple processing, with distinctive features carbon‐based fillers, high electrical thermal conductivities, excellent mechanical properties. Various fillers like carbon black (CB), graphite, expanded graphite (EG), nanotubes (CNTs) are being used to produce materials advanced However, at filler loading, these have some major challenges agglomeration. Recently, graphene...