scholarly journals Mesoscopic Patterning in Evaporated Polymer Solutions:  New Experimental Data and Physical Mechanisms

Langmuir ◽  
2005 ◽  
Vol 21 (25) ◽  
pp. 12053-12053
Author(s):  
Edward Bormashenko ◽  
Roman Pogreb ◽  
Oleg Stanevsky ◽  
Yelena Bormashenko ◽  
Tamir Stein ◽  
...  
Keyword(s):  
Experimental Data ◽  
Polymer Solutions ◽  
Physical Mechanisms

Mesoscopic Patterning in Evaporated Polymer Solutions:  New Experimental Data and Physical Mechanisms

Langmuir ◽  
2005 ◽  
Vol 21 (21) ◽  
pp. 9604-9609 ◽  
Author(s):  
Edward Bormashenko ◽  
Roman Pogreb ◽  
Oleg Stanevsky ◽  
Yelena Bormashenko ◽  
Tamir Stein ◽  
...  
Keyword(s):  
Experimental Data ◽  
Polymer Solutions ◽  
Physical Mechanisms

Research Regarding the Effects of 120 mm HE Mortar Bombs on Advanced Materials

2021 ◽  
Vol 42 ◽  
pp. 128-134
Author(s):  
Daniela Pintilie ◽  
Iuliana Florina Pană ◽  
Adrian Malciu ◽  
Constantin Puică ◽  
Cristina Pupăză
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Initial Velocity ◽  
High Explosive ◽  
Numerical Approach ◽  
Advanced Materials ◽  
Physical Mechanisms ◽  
Shock Wave Generation ◽  
3D Numerical Model ◽  
Experimental Trials

High Explosive Mortar bombs are used on the battlefield for destroying the manpower, non-armoured equipment and shelters. The paper describes an original experimental and numerical approach regarding the potential threats caused by the detonation of 120 mm HE mortar bombs. The evaluation of the bomb effect presumes the fulfillment of experimental trials that focus on two physical mechanisms which appear after the detonation of the cased high explosive. These mechanisms are the shock wave generation and the fragments propulsion, which were also studied by a numerical model that provides results over the bomb fragmentation mode. The novelty of the paper consists in the calibrated 3D numerical model confirmed by the experimental data, which provides information over the fragmentation process of the case and the initial velocity of its fragments, proving that the main threat of this type of ammunition is the effect through metal fragments. The results of numerical simulation and experimental data are used for their comparative analysis and the assessment of the phenomena.

Vapor–liquid equilibria in dendrimer and hyperbranched polymer solutions: experimental data and modeling using UNIFAC-FV

2004 ◽  
Vol 221 (1-2) ◽  
pp. 83-96 ◽  
Author(s):  
Matthias Seiler ◽  
Jörn Rolker ◽  
LyudmilaV. Mokrushina ◽  
Holger Kautz ◽  
Holger Frey ◽  
...  
Keyword(s):  
Experimental Data ◽  
Hyperbranched Polymer ◽  
Polymer Solutions ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

Turbulent boundary-layer structure in supersonic flow

1991 ◽  
Vol 336 (1641) ◽  
pp. 81-93 ◽  
Keyword(s):  
Experimental Data ◽  
Supersonic Flow ◽  
Boundary Layers ◽  
Large Scale ◽  
Layer Structure ◽  
Turbulent Boundary Layers ◽  
Recent Experimental Data ◽  
Physical Mechanisms ◽  
Compressible Boundary Layers ◽  
Reynolds Number Dependence

A summary is given of the recent experimental data on the structure of turbulent boundary layers in supersonic flow. The physical mechanisms differentiating incompressible and compressible boundary layers are discussed, and a simple model for the Mach and Reynolds number dependence of the decay of the large-scale motions is proposed.

scholarly journals Development of a Model Based on Physical Mechanisms for the Explanation of Drug Release: Application to Diclofenac Release from Polyurethane Films

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1230
Author(s):  
Navideh Abbasnezhad ◽  
Mohamed Kebdani ◽  
Mohammadali Shirinbayan ◽  
Stéphane Champmartin ◽  
Abbas Tcharkhtchi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Drug Release ◽  
Water Solution ◽  
Release Kinetics ◽  
Drug Carrier ◽  
Linear Optimization ◽  
Programming Algorithm ◽  
Burst Release ◽  
Drug Release Profile ◽  
Physical Mechanisms

In this study, we present a method for prediction of the drug-release profile based on the physical mechanisms that can intervene in drug release from a drug-carrier. The application presented here incorporates the effects of drug concentration and Reynolds number defining the circulating flow in the testing vein. The experimental data used relate to the release of diclofenac from samples of non-degradable polyurethane subjected to static and continuous flow. This case includes simultaneously three mechanisms: burst-release, diffusion and osmotic pressure, identified beforehand here as being able to contribute to the drug liberation. For this purpose, authors coded the Sequential Quadratic Programming Algorithm to solve the problem of non-linear optimization. The experimental data used to develop the mathematical model obtained from release studies carried out in water solution at 37 °C, for three concentrations of diclofenac and two water flow rates. We discuss the contribution of mechanisms and kinetics by considering two aforementioned parameters and, following that, we obtain the specific-model and compare the calculated results with the experimental results for the reserved cases. The results showed that drug percentage mostly affect the burst release, however flow rate has affected the osmotic release. In addition, release kinetics of all the mechanisms have increased by increasing the values of two considered parameters.

scholarly journals Simulation of electrical tree propagation in a solid insulating material containing spherical insulating particle of a different permittivity with the aid of cellular automata

2004 ◽  
Vol 17 (3) ◽  
pp. 377-389 ◽  
Author(s):  
George Vardakis ◽  
Michael Danikas
Keyword(s):  
Experimental Data ◽  
Spherical Particle ◽  
Electrical Field ◽  
Technical Literature ◽  
Insulating Material ◽  
Physical Mechanisms ◽  
Electrical Tree ◽  
Simulation Results ◽  
Material Setting ◽  
Shed Light

The electrical tree propagation inside a solid insulating material is simulated in the present paper. The effect of a small insulating spherical particle inside the solid insulating material is investigated as far as the electrical field is concerned. Laplace's equation is solved inside the solid insulating material setting the boundary conditions around the spherical particle. An attempt for comparison between the simulation results and experimental data from the technical literature is being made, trying to shed light to the physical mechanisms that are involved in the phenomenon.

CFD Analysis of Gear Windage Losses: Validation and Parametric Aerodynamic Studies

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Matthew J. Hill ◽  
Robert F. Kunz ◽  
Richard B. Medvitz ◽  
Robert F. Handschuh ◽  
Lyle N. Long ◽  
...  
Keyword(s):  
Experimental Data ◽  
Spur Gear ◽  
Mitigation Strategies ◽  
Test Facility ◽  
Cfd Analysis ◽  
Physical Mechanisms ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Cfd Analyses ◽  
Good Agreement

A computational fluid dynamics (CFD) method has been applied to gear configurations with and without shrouding. The goals of this work have been to validate the numerical and modeling approaches used for these applications and to develop physical understanding of the aerodynamics of gear windage loss. Several spur gear geometries are considered, for which experimental data are available. Various canonical shrouding configurations and free spinning (no shroud) cases are studied. Comparisons are made with experimental data from open literature, and data recently obtained in the NASA Glenn Research Center Gear Windage Test Facility, Cleveland, OH. The results show good agreement with the experiment. The parametric shroud configuration studies carried out in the Glenn experiments and the CFD analyses elucidate the physical mechanisms of windage losses as well as mitigation strategies due to shrouding and newly proposed tooth contour modifications.

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