Article
Chemistry, Physical
Ahmed Amin Touazi, Saeda Didaoui, Kamel Khimeche, Mohamed Rial, Sid Ali Moulai, Mokhtar Benziane
Summary: This research presents experimental measurements of physical properties of two binary liquid mixtures of n-tetradecane with 1-pentanol and 2-pentanol, including density, viscosity, excess molar volume, and more. The study provides important insights into the thermophysical properties of these mixtures. Ultimately, forming a biojet by mixing biomolecules with n-paraffins can improve energy efficiency and reduce carbon dioxide emissions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Mechanics
H. Neshasteh, M. Ravaro, I. Favero
Summary: The lack of an analytical fluid-structure model hinders the inference of liquid properties from the experimental measurement of radial vibrations of miniature disk-shaped resonators, which are promising candidates for probing ultra-high-frequency rheological properties of liquids. In this study, analytical models are developed for a disk vibrating in a compressible viscous liquid. Closed-form expressions for the mechanical quality factor and resonant frequency shift upon immersion are obtained and compared with the results of numerical modeling for a few significant cases. Our model highlights the significance of compressibility effects at frequencies above 1 GHz.
Article
Energy & Fuels
Monika Zarska, Michal Zorebski, Marzena Dzida
Summary: This study investigates the high-pressure thermophysical properties of butyl-based fatty acid esters in order to optimize the spray characteristics in diesel injection systems. Measurements of speed of sound, density, isobaric heat capacity, viscosity, and surface tension were conducted under different temperatures and pressures. The results show that the differences between density and isentropic compressibility of the esters can be compensated by adjusting temperature and/or pressure. Comparisons with other fuels suggest that butyl-based fatty acid esters have potential as fuel additives in biodiesel.
Article
Chemistry, Physical
Andrzej A. Grzybowski, Alexander R. Lowe, Bernadeta Jasiok, Miroslaw Chorazewski
Summary: In this paper, thorough analyses of volumetric and viscosity data for six oils have been conducted, investigating their thermodynamic and dynamic properties. The study explores the intersection and inflection points in the temperature-pressure relations of these oils, revealing their distinct characteristics and behaviors, which contribute to a better understanding and further research on the physicochemical properties of oils.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Mechanics
V. V. Konovalov, D. Lyubimov, T. P. Lyubimova
Summary: The study focuses on resonance oscillations of a single liquid drop or gas bubble relative to their equilibrium spherical shape, investigating the effect of viscosity on resonance and revealing the equivalence of two methods in accounting for viscosity.
Article
Chemistry, Physical
Alejandro Moreau, Manuel Sobrino, Johnny Zambrano, Jose J. Segovia, Miguel A. Villamanan, M. Carmen Martin
Summary: This study focused on characterizing four alcohols through viscosity measurements using two different equipment, with experimental data fitted to theoretical models resulting in low standard deviations.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Multidisciplinary
Zhiyong Xie, Yongjun Jian, Xingyu Chen
Summary: This study theoretically investigates the electrokinetic energy conversion efficiency in high pressure-driven flow, taking into account the pressure-viscosity effect. The electrokinetic flow in a straight nanochannel is calculated by solving the Poisson-Boltzmann equation and modified fluid momentum equation. The unknown fluid viscosity in the strongly non-linear governing equation is solved using the domain perturbation method. Based on the obtained velocity and pressure, the maximum conversion efficiency is calculated by thermodynamic analysis. The results show that the maximum efficiency increases with decreasing salt concentration and can be achieved at sufficiently low salt concentration. For a given salt concentration, the maximum efficiency decreases monotonically with increasing pressure-viscosity coefficient. Moreover, the maximum energy conversion efficiency considering the pressure-viscosity effect is smaller than that ignoring the pressure-viscosity effect.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Aydar A. Akhmadiyarov, Wojciech Marczak, Artem A. Petrov, Ilnaz T. Rakipov
Summary: The reported study conducted a test of Anton Paar DMA 4200 M densimeter for measurements at elevated pressures, showing high accuracy and reliability. The use of two standard liquids and a calibration equation provided suitable density measurements for the entire range of pressure and temperature. The validation with known density liquids further confirmed the accuracy of the densimeter, with results matching data reported in literature.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Jose I. Prado, Javier P. Vallejo, Luis Lugo
Summary: The use of nanomaterials in addressing the global issue of thermal energy consumption has proven to be effective in improving energy efficiency and promoting eco-friendly devices. This study focuses on magnesium oxide-based nanofluids designed for cold storage applications, examining the impact of modified thermophysical properties on heat transfer capability. Experimental measurements of thermal conductivity, viscosity, density, and isobaric heat capacity were conducted, and a relationship between the thermal conductivity and viscosity of nanofluids was proposed and validated.
Article
Chemistry, Physical
Manuel Kerscher, Tobias Klein, Patrick Preuster, Peter Wasserscheid, Thomas M. Koller, Michael H. Rausch, Andreas P. Froeba
Summary: This study investigates the effects of dissolved hydrogen on the thermophysical properties of liquid organic hydrogen carriers (LOHCs) through surface light scattering experiments and molecular dynamics simulations. The results show that pressure has a negligible effect on viscosity, while the interfacial tension decreases by about 6% at 7 MPa. The simulations indicate a weak enrichment of hydrogen at the interface.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Lukas Lundgren, Murtazo Nazarov
Summary: In this paper, a high-order accurate finite element method for incompressible variable density flow is introduced. The method addresses the issues of saddle point system and stability problem through Schur complement preconditioning and artificial compressibility approaches, and it is validated to have high-order accuracy for smooth problems and accurately resolve discontinuities.
JOURNAL OF COMPUTATIONAL PHYSICS
(2024)
Article
Thermodynamics
Olga Prokopova, Ales Blahut, Miroslav Censky, Monika Souckova, Vaclav Vins
Summary: Vibrating tube densimeter is a popular instrument for quick and accurate density measurement of liquids and gases. This study presents a calibration procedure and uncertainty analysis for a commercial borosilicate glass vibrating tube densimeter and verifies its effectiveness. The influence of fluid viscosity and damping, isotopic composition of calibration water, measurement procedure, and water content in samples are also discussed.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2022)
Article
Chemistry, Physical
Sa Xue, Kun Hou, Ziwen Zhang, Hui Liu, Chenyang Zhu, Xiangyang Liu, Maogang He
Summary: The study developed prediction models for density and viscosity of fatty acid esters based on their molecular structure, finding that the properties are influenced by temperature, pressure, and molecular structure. Different models were proposed for various types of fatty acid esters with low average absolute relative deviations.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Electrical & Electronic
Pallavi Sharma, Irma Rocio Vazquez, Nathan Jackson
Summary: This work presents the development of a Microelectromechanical systems vibrating mesh atomizer capable of atomizing higher viscosity fluids while maintaining high droplet size uniformity.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Hamzeh Kashani, Chunghwan Kim, Christopher Rudolf, F. Keith Perkins, Erin R. Cleveland, Wonmo Kang
Summary: This study demonstrates significantly enhanced electrical properties by synthesizing axially continuous graphene layers on microscale-diameter wires. The continuous graphene layers considerably improve heat dissipation, electrical conductivity, and thermal stability, allowing for the application of extremely large current densities through the wires. Through high-speed camera images, it is observed that the ACGC wires exhibit very different failure behavior near the current density limit compared with pure copper wires.
ADVANCED MATERIALS
(2021)
Article
Thermodynamics
Maria C. M. Sequeira, Helena M. N. T. Avelino, Fernando J. P. Caetano, Joao M. N. A. Fareleira
FLUID PHASE EQUILIBRIA
(2020)
Article
Engineering, Chemical
Monica Antunes, Mariana T. Donato, Victoria Paz, Fernando Caetano, Luis Santos, Rogerio Colaco, Luis C. Branco, Benilde Saramago
Article
Chemistry, Multidisciplinary
Mariana T. Donato, Fernando Caetano, Rogerio Colaco, Luis C. Branco, Benilde Saramago
Article
Education & Educational Research
Tiago A. Fernandes, Fernando J. P. Caetano
Summary: This article discusses the evaluation of student assignments in a food preservation technology course, analyzing students' commitment to learning and knowledge acquisition, as well as the tools and methods used to differentiate the quality of assignments.
INTERNATIONAL JOURNAL OF TECHNOLOGY AND DESIGN EDUCATION
(2022)
Article
Thermodynamics
Maria C. M. Sequeira, Helena M. N. T. Avelino, Fernando J. P. Caetano, Joao M. N. A. Fareleira
Summary: New high-pressure viscosity measurements were conducted for 1-butyl-3-methylimidazolium triflate ([BMIM][ OTf]) and 1-hexyl-3-methylimidazolium triflate ([HMIM][OTf]) using a vibrating-wire technique. The viscosity and density data were correlated, showing good agreement and the analysis of alkyl substituents on the viscosity and density of these ionic liquids was performed using previously published data.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Thermodynamics
Maria C. M. Sequeira, Helena M. N. T. Avelino, Fernando J. P. Caetano, Joao M. N. A. Fareleira
Summary: This article presents novel measurements of the viscosity of liquid n-heptadecane at various pressures and temperatures, along with density measurements, providing correlations between viscosity and molar volume. The experimental data supports interpolation of viscosity with respect to temperature and pressure, showing variations of viscosity with changes in pressure and temperature.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Thermodynamics
Maria C. M. Sequeira, Helena M. N. T. Avelino, Fernando J. P. Caetano, Joao M. N. A. . Fareleira
Summary: New measurements for the viscosity and density of poly(ethyleneglycol) 200 and poly(ethyleneglycol) 600 at high pressures were presented. The measurements were carried out using a vibrating wire viscometer and a vibrating tube densimeter. The obtained data were used to correlate viscosity with density and to determine the pressure-viscosity coefficients for both polymers.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Thermodynamics
Maria C. M. Sequeira, Bernardo A. Nogueira, Fernando J. P. Caetano, Herminio P. Diogo, Joao M. N. A. Fareleira, Rui Fausto
Summary: This study contributes to the thermal characterization of a selected binary system of two di-n-alkyl adipates for thermal energy storage. The construction of the phase diagram using DSC and Raman Spectroscopy is presented. The binary system exhibits eutectic behavior and a polymorphic transition. Raman spectroscopy plays a critical role in identifying the solid and liquid phases. The liquidus curve of the phase diagram is successfully predicted with a suitable fitting equation.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Thermodynamics
Haolei Yang, Xiaoqiang Bian, Lianguo Wang
Summary: A new association model, CPA-MHV1, combining the SRK equation of state with the CPA equation based on Michelsen's improved Huron-Vidal mixing rule, is developed. The model is used to investigate the vapor-liquid equilibrium of binary mixtures involving CH4, CO2, and H2O, as well as ternary mixtures containing NaCl. The results show that considering the solvation between CO2 and H2O yields the best performance, while CH4 with a pseudo-association scheme has the highest comprehensive prediction performance.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Vikas K. Sinha, Atanu K. Metya, Chandan K. Das
Summary: In this study, the solid-liquid coexistence curve for water was developed using coarse-grained mW and machine-learned ML-BOP water models. The ML-BOP model exhibited lower densities, a broader density-temperature hysteresis loop, and higher free energy compared to the mW model. The pressure dependence fusion curve for both models aligned with previous literature. This analysis demonstrates that the free energy method accurately captures the solid-liquid transformation and the thermodynamic melting point of water.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Curtis Hays Whitson
Summary: This article tells the story of an extraordinary individual who made numerous and valued contributions, portrayed through a few images and short stories.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Joe Hajjar, Sabine Enders
Summary: A generalized theoretical framework is introduced for multicomponent reactive nonuniform systems, combining the modified and generalized Cahn-Hilliard equation with a chemical kinetics model. The framework allows for the modelling and investigation of the combined reaction and diffusion in reactive liquid-liquid systems. It is found that for reacting mixtures with much smaller reaction rates than diffusion rates, the mixture will remain in phase equilibrium upon reaction and the interfacial chemical reaction will not affect the overall system dynamics, which are only influenced by the kinetics of the bulk phases.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Keycianne da Cruz Silva, Leticia Daniela de Souza, Vinicius Azevedo Gomes, Leandro Rodrigues de Lemos
Summary: Phase diagrams of four aqueous two-phase systems were determined experimentally, and conclusions were drawn regarding the effect of temperature on system enthalpy change and the influence of macromolecules on phase separation.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Yuanqing Wu, Shuyu Sun
Summary: The sparse-grid guided PINN training method improves the accuracy of the PINN surrogate model by rearranging collocation points and reduces the training time complexity. Experimental results demonstrate its clear advantages in terms of convergence, stability, and accuracy.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Peter Englezos
Summary: This article discusses the research progress and challenges in the field of canonical clathrate or gas hydrate phase equilibria, as well as the application of computational methods and models. It also explores the potential of machine learning techniques in hydrate and thermodynamic calculations.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Ying-Chieh Hung, Shao-Wei Su, Jia-Wei Yan, Gui-Bing Hong
Summary: In this study, VLE data for five binary systems were measured and successfully correlated using models. The predictive models were used to predict the binary VLE phase diagram and explain the mechanism of separation efficiency. The strength of electrostatic interactions and temperature-dependent separation behavior were determined through the analysis of molecular surface charge distribution.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Matevz Turk, Tomaz Urbic
Summary: By molecular dynamics and Monte Carlo simulations, this study determined the regions and hierarchy of anomalies in a purely repulsive core-softened system. It was found that in two dimensional systems, a size of 100 particles is sufficient for obtaining accurate details.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Adnan Jaradat, Rakan Al-Salman, Abdalla Obeidat
Summary: The vapor-liquid equilibrium of six primary alcohols were studied using molecular dynamics simulations and compared with experimental results. The study found that neglecting the Lennard-Jones interaction significantly reduced the critical temperature values and determining the critical temperature using surface tension gave more accurate results. The TraPPE-UA potential field showed good accuracy in predicting the critical temperature.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Michele Valsecchi, Amparo Galindo, George Jackson
Summary: The thermodynamic properties of aqueous mixtures of polyethylene glycol (PEG) are described using the SAFT-gamma Mie group-contribution equation of state. The model successfully predicts the miscibility gaps in a temperature range and shows good agreement with experimental results.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Roman Tomaschitz
Summary: Analytic closed-form expressions for the liquid and vapor saturation densities defining the coexistence curve are obtained. The coexistence curves of nitrogen, ethene, and sulfur hexafluoride are derived using high-precision data, and the critical power-law scaling of the order parameter and coexistence-curve diameter is examined. The Log-Log slopes of various quantities are used to determine the ideal power-law scaling regime and illustrate the slope evolution in the subcritical regime.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Nivaar Brijmohan, Kuveneshan Moodley, Caleb Narasigadu
Summary: An artificial neural network-based QSPR model was developed to estimate binary interaction parameters for the temperature-dependant form of the NRTL model. This model serves as a supplement to overcome limitations of group contribution methods in solvent screening and has been proven to be effective in improving the robustness of the screening process.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Marco Campestrini, Paolo Stringari, Salem Hoceini
Summary: In this paper, the solubility of benzene in different phases of methane was predicted using the GERG-2008 equation of state and the Gibbs free energy equation. The obtained results were in good agreement with experimental data and emphasized the significance of accurately representing the density of the fluid phase for predicting the solubility of solids in fluids.
FLUID PHASE EQUILIBRIA
(2024)
Article
Thermodynamics
Nefeli Novak, Georgios M. Kontogeorgis, Marcelo Castier, Ioannis G. Economou
Summary: This paper discusses theoretical considerations on electrolyte thermodynamic models for single and mixed solvent solutions. The authors find that there is no consensus among researchers on many fundamental issues in this field. They point out the need to convert electrolyte terms to the framework of the physical model and emphasize the importance of the Born term for liquid-liquid equilibrium calculations.
FLUID PHASE EQUILIBRIA
(2024)