Density, viscosity, refractive index, and related thermophysical properties of dibutyl ether +2-butanol + cyclohexane ternary systems

Producción CientíficaNew measured data for density, (ρ), dynamic and kinematic viscosities, (μD and μc), and refractive index, (nD), are presented at T = 298.15 K and p = 0.1 MPa for binary and ternary mixtures containing dibutyl ether, 2-butanol, and cyclohexane. As a result, the derived properties are estimated based on the measured data. Excess molar volume, (VE), dynamic viscosity deviation (ΔμD), and deviation in refractive index, (ΔnD), as derived properties, are fitted using the Redlich–Kister equation. In addition, perturbed-chain statistical associating fluid theory equation of state is employed to correlate the measured data of density

Investigación Experimental y Modelización de las Propiedades Termofísicas de Fluidos Complejos de Interés para la Formulación de Biocombustibles Ambientalmente Sostenibles

En esta Tesis se aborda la caracterización de fluidos complejos para suministrar conocimiento de datos termofísicos de mezclas de hidrocarburos con aditivos oxigenados (éteres de glicol, éteres y alcoholes) que contribuya a la mejora de nuevos combustibles líquidos. Este objetivo está en línea con la perspectiva de incrementar el uso de los biocombustibles para el transporte como parte de la Estrategia Internacional de Eficiencia Energética para 2030. Los objetivos del trabajo son: − Determinación experimental de la entalpía de mezcla, densidad, viscosidad dinámica y cinemática, velocidad del sonido, índice de refracción y sus propiedades derivadas de mezclas binarias y ternarias, a presión atmosférica, a 298.15 y 313.15K. − Medida de densidad y viscosidad de compuestos puros y mezclas binarias a altas presiones, hasta 70 MPa, y de 293,15 hasta 393,15K. − Ajuste de los datos mediante ecuaciones: Redlich-Kister, Tait y Vogel-Fulcher-Tamman. Y su modelización mediante PC-SAFT, Peng-Robinson NRTL y UNIQUAC

New Analytical Model of human body arm movements under various solicitations by the finite Element Analysis

The movement of a human arm body is complex since it is composed of an assembly of elements in three-dimensional movement, thus, modeling this arm is required to write its various movements using systems of simple and convergent equations. Therefore, the finite element method is an essential method to write and analyze the different kinematic and dynamic movements of the arm. The position of stress, strains, velocity, and acceleration in the different limbs of the arm have been determined and analyzed. The applications of this topic may have a great importance in the field of biomechanics, especially when the material considered is of the isotropic or orthotropic type. Good comparisons were observed for both types of materials investigated in our research

Thermophysical Study on the Mixing Properties of Mixtures Comprising 2-(2-Methoxyethoxy)ethanol, Butan-1-ol, Butan-2-ol, and Propan-1-ol

Excess enthalpy (HE), dynamic and kinematic viscosities (η, υ), density (ρ), and refractive index (nD) of mixtures comprising 2-(2-methoxyethoxy)ethanol, butan-1-ol, butan-2-ol, and propan-1-ol are presented at p = 0.1 MPa and at T = 298.15 and 313.15 K. Deviations in refractive index (ΔnD) is generated from experimental data of refractive index. Experimental data of ρ for all binary mixtures are predicted using the PC-SAFT (Perturbed Chain-Statistical Associating Fluid) EoS. Furthermore, HE and ΔnD are adjusted using the Redlich–Kister equation. However, the correlation of measured data of HE is performed by using the UNIQUAC and NRTL models

Elaboration and characterization of PMN–xPT solid ceramics used in a numerical simulation of a piezoelectric transducer for a loudspeaker application

International audienceSolid ceramics (1 − x)PbMg1/3Nb2/3O3–xPbTiO3 (PMN–xPT) have been prepared and characterized in the present work. Three PMN–xPT compositions were used with x taking the values of 0.31, 0.33 and 0.35. For the three compositions, an analysis of the dielectric behavior has been made, in order to determine the phase transition temperatures and Curie’s temperatures by measuring the dielectric constants and the dielectric losses as a function of temperature and frequency. A typical behavior to that of ferroelectric relaxor materials was noted by the increase of the PT’s rate. Ferroelectric character was analyzed by studying the evolution of polarization as a function of the applied field for the different samples, with the variation of the temperature. The hysteresis loop was strongly modified by the action of the temperature. The remnant polarization, as well as the coercive field, decreases with the increase of the temperature and increase with the increase of the applied field. Due to their high dielectric and ferroelectric properties, a numerical simulation by a finite element analysis software was made on PMN–0.35PT pellets, used for a loudspeaker application. The mechanical and acoustic behaviors of the piezoelectric transducer were investigated

Ingénierie thermodynamique. Équation d'etat thermique par l'expérimentation

En muchas industrias se emplean fluidos en los procesos de producción. Estos fluidos, sean líquidos, gases o mezclas de ambos, se almacenan en depósitos y se transportan por conductos en las instalaciones industriales. El volumen que cada kilogramo de fluido ocupa en estas instalaciones puede variar si también lo hacen su presión y temperatura. Encontrar esta interdependencia entre presión, volumen y temperatura resulta crucial para dimensionar depósitos y conductos. Conocer la relación matemática que expresa la interdependencia física de estas tres propiedades es esencial en ingeniería. En este libro veremos de modo experimental la interdependencia que presentan las propiedades presión, volumen y temperatura en fluidos. Lo haremos a través un caso práctico. En este libro mostraremos: 1) la dependencia mutua de las variables de estado presión-volumen-temperatura (PVT) para el fluido contenido en un volumen variable al modificar la presión y la temperatura. 2 ) la distinción de las propiedades de un fluido en las diferentes zonas de operación. 3 ) la obtención de la curva de vaporización presión-temperatura (P-T) y el diagrama presión-volumen (P-V) de un fluido

Dielectric and mechanical optimization properties of porous poly(ethylene-co-vinyl acetate) copolymer films for pseudo-piezoelectric effect

International audienceIn this article, the authors present a porous copolymer film with pseudo-piezoelectric effects as a new candidate material for sensing applications. Porous films of poly(ethylene-co-vinyl acetate) (EVA) with a thicknesses ranging from 160 to 310 μm are fabricated by a coextrusion chemical foaming process and charged using a high-voltage contact charging process. Output performances (piezoelectric constant and relative permittivity) with related thermal/mechanical stability are specifically studied as a function of the film porosity and of the electrical charging process. The piezoelectric constant d33 increases with the cell porosity and an interesting piezoelectric constant close to 5.1 pC/N is achieved with a porous EVA film containing 65% of porosity. Actual results are then discussed using a theoretical solid–gas multilayer model to describe and predict the pseudo-piezoelectric effect of porous polymer materials. The originality of this work lies in the fact that all the steps leading to optimize pseudo piezoelectric films are included, and also in the use of EVA which is not a standard piezoelectric material. Therefore, this work is a contribution in the development of low-cost piezoelectric materials with potential applications as sensor in different fields such as medical, security, environment, sport, and transport. POLYM. ENG. SCI., 59:1455–1461 2019. © 2019 Society of Plastics Engineers. © 2019 Society of Plastics Engineer

Excess molar enthalpy measurement and modelling of (oxygenated compounds + hydrocarbon) mixtures: Binary and ternary mixtures containing 2-(2-methoxyethoxy)ethanol, 1-hexene and cyclohexane at (298.15 and 313.15) K

NEW measurements and modelling data of excess molar enthalpy HE at atmospheric pressure and temperatures of (298.15 and 313.15) K using a quasi-isothermal flow calorimeter are presented in this work for the ternary system diethylene glycol monomethyl ether glycol (2-(2-methoxyethoxy)ethanol) + 1-hexene + cyclohexane and the corresponding binary systems over the whole composition range. All the binary and ternary systems present an endothermic behaviour at the chosen temperatures. The experimental data of the binary and ternary systems were correlated using the modified Redlich-Kister equation, NRTL and UNIQUAC models

Study of crystallization and melting-solidification processes in some fatty acids as phase change materials (PCMs)

Ponencia presentada en: 13th National and 4th International Conference in Engineering Thermodynamics (13CNIT). Universitat Jaume I, Castellón de la Plana (Spain), 29th November to 1st December 2023