When applied to asymmetric binary mixtures (e.g., methane + pentane or heavier alkanes, hydrogen-containing mixtures), the GERG equation of state (GERG-2004 or GERG-2008) predicts critical curves with physically unreasonable temperature maxima above the critical temperature of the heavier component. These maxima are associated with physically impossible vapor–liquid equilibria. The phenomenon is probably

Measurement of ultrasonic sound velocity in ionic liquids and ionanofluids can give important information about the liquid structure, nanoparticles interactions, effect of water, extent of intermolecular association and the kinetics of molecular processes. Here, the acoustic properties of certain pyridinium-based ionic liquids and their iron oxide-based ionanofluids have been studied using a nanofluid

This study obtained the precise measurements of the vapor–liquid equilibrium properties for R32/R1234yf binary mixtures, which are the key components for the next-generation refrigerant mixtures. To obtain the data more rapidly and precisely, two recirculation-type vapor–liquid equilibrium property measurement apparatuses installed in different universities are used. One apparatus, which was used to

An amendment to this paper has been published and can be accessed via the original article.

Due to their high thermal conductivity, open-cellular metal foams are frequently used to improve the thermal conductivity of phase change materials. In this paper, the effective thermal conductivity of open-cellular foam filled with PCM with cubic units containing 12 solid tubular ribs was determined using an effective medium theory for composites. It was shown that metal foams with a large ratio of

The surface tensions of aqueous solutions of sodium lauryl ether sulfate (SLES), ethanol, acetonitrile, 1-propanol and 2-propanol were individually measured using the pendant drop technique. Then, the surface tensions and critical micelle concentrations of the mixed aqueous solutions of (SLES + additives) were then measured at different concentrations of species for the first time. All measurements

In the current work, the viscosity of hybrid WO3-MWCNTs/Engine Oil nanofluids for the different volume fraction of nanoparticles (φ), temperatures, and shear rates has been measured, and then using Artificial Neural Network (ANN) has been predicted. The statistical reports of ANN have been presented in figures and tables, and it could be found that the designed ANN has an acceptable accuracy in predicting

The present study investigates the ability to improve the stability and heat transfer performance of coolants by dispersing TiO2 nanoparticles in water. Surfactant-free nanofluid with 5 different weight fractions of 1 %, 0.5 %, 0.1 %, 0.05 %, and 0.01 % were prepared by two-step method. The stability of nanofluid was examined. The thermal conductivity and viscosity of TiO2/water nanofluid of 5 concentrations

An energy transfer model of a thermophotovoltaic (TPV) system, considering the variation of GaSb cell parameters under the near-field thermal radiation, was constructed. The effects of emitter–cell distances with different cooling systems on cell parameters and TPV system performances were analyzed. The results show that if the cell temperature is set at 300 K, the required convective heat transfer

7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-enium acetate (mTBD acetate) is a protic ionic liquid that is being investigated for use in industrial processes, such as for producing textiles from cellulose. To aid in designing such processes, we have measured the densities, viscosities, and thermal conductivities of mTBD acetate and aqueous mixtures containing mTBD acetate. We also investigated how excess

This investigation presents novel applications for bioconvection flow of non-Newtonian fluid with diverse flow features. The developed unsteady bio-nano-transport model is formulated under the influence of some novel features such as variable thermal conductivity, heat absorption/generation and activation energy. In contrast to typical investigations, the flow has been originated by accelerated porous

Heat recovery units are used for pre-heating the fresh air in waste heat plants. The nanofluid used as working fluid in the heat pipe will allow the heat recovery unit to benefit from the waste heat at lower temperatures, since it can evaporate at a temperature lower than the temperature of the base fluid. Therefore, the range of the operating temperature of the heat recovery unit will be increased

Solar thermal collectors are systems that allow for the use of solar energy in thermal applications. These collectors utilize a heat transfer fluid to transport absorbed solar radiation to applications where they are needed. Scientists in a bid to improve the conversion efficiency of solar collectors have suggested different collector designs and improved collector materials. Over the last 25 years

Densities of two methane-rich binary mixtures were measured in the homogeneous liquid and the supercritical region at temperatures between (100 and 160) K using a low-temperature single-sinker magnetic-suspension densimeter. For each mixture, four isotherms were studied over the pressure range from (0.3 to 10.8) MPa. Molar compositions of the gravimetrically prepared methane-rich binary mixtures were

Graphene aerogel (GA) as one of the innovative carbon nanostructured materials is superior with flexibility, strong mechanical strength, lightweight, high porosity and excellent durability, which attracted wide research interests and fulfill the requirements for various novel applications in energy conversion and storage, sensor, thermal management, and environment areas, etc. The thermal property

The original version of the article unfortunately contained some errors in Table 4 where the temperatures were out of the correct order. The corrected version of Table 4 is given below.

This work describes measurements of the thermal conductivity of three polyol esters pentaerythritol tetrapentanoate (POE5), pentaerythritol tetraheptanoate (POE7), pentaerythritol tetranonanoate (POE9), and a fully qualified lubricant meeting military specification MIL-PRF-23699 with a transient hot-wire method. Correlations for the thermal conductivity based on the measurements are also provided.

This work investigates the spectral radiative properties of ceramic particles using a monochromator and a Fourier-transform infrared spectrometer (FTIR) with integrating spheres at wavelengths from 0.38 μm to 15 μm. Particles are encased between two transparent windows to obtain the directional-hemispherical reflectance of the particle bed. Two types of commercially available particles with three different

This review discusses, in terms of practical aspects and future application, about heat transfer fluids properties with special focus on the possible use of ionic liquids in heat transfer applications. Even if some data were identified in the open literature, most of the ionic liquids studies on thermophysical properties are yet at the beginning and fully described chemicals are scarce. The most relevant

The As–Se glass is a large subgroup in the class of chalcogenide glass, which is widely used in electronics and photonics. Glass transition onset temperature, \(T_{g}\), is an important thermal parameter that needs to be considered during manufacturing and practical applications. Numerous experimental and theoretical approaches have been conducted to investigate \(T_{g}\), but they tend to be resource-intensive

The present study has been dedicated to modeling the surface tension and viscosity of (dimethylsulfoxide + alcohol) mixtures. The self and cross-association have been considered for both alcohol and dimethylsulfoxide, and the Cubic-Plus-Association equation of state is applied to the phase equilibrium calculations. The binary interaction parameters are obtained according to the experimental phase equilibrium

To solve the problem of high cost and low strength of aerogel-based building materials, expanded perlite filled with aerogel (EPA) has been made by filling the pores in the expanded perlite with aerogel. Adding EPA to cement-based material can reduce the thermal conductivity of the cement-based material. In this study, in order to investigate the thermal conductivity of materials with different content

Thermal bridge method is widely used in thermal conductance measurements of one-dimensional nanostructures. The studies used by thermal bridge method advances our understanding of one-dimensional nanoscale thermal transport. And many efforts have been made to boost the reliability of the thermal bridge method and improve the measurement sensitivity. In this paper, uncertainty analysis is performed

Equations of state based on intermolecular potentials are often developed about the Lennard-Jones (LJ) potential. Many of such EOS have been proposed in the past. In this work, 20 LJ EOS were examined regarding their performance on Brown’s characteristic curves and characteristic state points. Brown’s characteristic curves are directly related to the virial coefficients at specific state points, which

The effective thermal conductivity of porous materials is determined by many factors. Previous works were mainly focused on the pore content and the thermal conductivity of two components. However, few researches pay attention to the effects of pore complex shape, overlap and distribution. In this study, the effects of pore complex shape, distribution and overlap are investigated at the same time.

Mixtures of fluorinated and non-fluorinated ionic liquids (ILs) show a distinct structural organization in the bulk and at the surface. To understand how such microscopic effects influence the macroscopic bulk and surface properties of IL mixtures, knowledge of corresponding thermophysical properties including viscosity and surface tension is required yet lacking. With the intention of investigating

An amendment to this paper has been published and can be accessed via the original article.

For wood, water diffusivity is an important factor that influences its mechanical and physical properties. In this experimental study, the water absorption and desorption were investigated in linear directions for woods of two Eucalyptus clones; Eucalyptus grandis and Eucalyptus camaldulensis. The diffusion model based on Fick’s second law was applied to assess both water absorption and desorption

Knowledge of the stability limit and critical point of the H2–CO2–CH4–CO–H2O system is significant for the management and optimization of the gasification systems of organic substances in supercritical water. We report thermodynamic calculations of the stability limits and critical points of the H2–CO2–CH4–CO–H2O system based on the cubic equation of state. Prior to the calculations of the quinary

The correct expression of temperature measurement results is of the utmost importance for experimental research in thermal sciences. Temperature measurements are used in heat transfer models to estimate various parameters, either in direct or inverse problems. The reliability of these parameter values depends mainly on the uncertainty associated with the measured temperature. This paper deals with

The density as a function of temperature was determined for liquid iridium (Ir) and rhenium (Re) by means of shadow imaging in ohmic pulse-heating experiments. In addition to regular experiments at \(0.23\,\text {MPa}\), high-pressure experiments at static pressures between \(0.18\,\text {GPa}\) to \(0.30\,\text {GPa}\) were performed to increase the metals’ boiling point and thus determine density

This study focuses on production of lightweight concrete that presents thermal insulation property. Lightweight concretes were produced using resin-added cement and expanded vermiculite. The rates of expanded vermiculite were determined as 20%, 40%, 60%, and 80% of the total volume in the mixture. The amount of tragacanth resin in the mixture was detected as 0%, 0.5% and 1% of the total weight of cement

There is a renewed interest in the use of the refrigerant CF\(_3\)I for refrigeration and air-conditioning applications, driven by its low global warming potential (similar to that of CO\(_2\)), low (but nonzero) ozone depletion potential, and its ability to suppress flammability. In this paper, the existing thermodynamic data for this fluid are summarized. Furthermore, as CF\(_3\)I has been proposed

The ground state properties of the Mg2Sn compound under seven different crystal structures were studied using a first principles approach based on the full-potential augmented plane wave method FP-LAPW within the GGA-PBEsol approximation. We fixed the cubic structure of CaF2-type as zero pressure phase and we have considered the orthorhombic PbCl2-type, hexagonal Ni2In-type, tetragonal Al2Cu-type,

A recent interest in the mechanical properties of spider silk has also brought about investigations into the thermal properties of thin fibers, often with contradictory results. Because of the high length-to-diameter ratio of fibers, two key obstacles arise during their thermal characterization: the need to develop non-standard techniques to measure properties and the lack of reliable methods to confirm

Indian Geranium Grass popularly known as palmarosa is widely grown in many parts of Indian Sub-continent and used for its aromatic flavor in South American and Middle East countries. In this current study, Indian Geranium Grass oil is blended with diesel in different proportions from 0 % to 100 % by volume and its impact on performance, combustion and emission characteristics is investigated in a single-cylinder

Nanofluids have been widely used as working fluids in thermal systems on account of their enhanced aptitudes on heat transfer. In this paper, an aqueous hybrid nanofluid suspension including Fe and CuO nanoparticles (50:50) was prepared at 2 % mass concentration and utilized as working fluid inside a plain heat pipe under miscellaneous working conditions implemented on both evaporator and condenser

In this computational research, we study the electric field and microchannel type effects on H2O/Fe3O4 nanofluid dynamical manner. The dynamical characteristics of this atomic structure are calculated using molecular dynamics method and we reported physical parameters such as total temperature, total energy, radial distribution function, velocity, density and temperature profiles of H2O/Fe3O4 nanofluid

Thermal contact resistance is one of the factors that complicates heat transfer between the interfaces of different components. Because heat transfer is influenced by several factors, it is difficult to estimate all the influencing factors for practical applications. In this study, the thermal contact resistance between two solid surfaces was evaluated using the photoacoustic (PA) technique. The samples

The densities and dynamic viscosities of three binary liquid mixtures of tricyclo [5.2.1.02,6] deca-3,8-diene(endo-DCPD) with ethanol, 2-propanol and 1-pentanol at different temperatures (293.15, 303.15 and 313.15) K and atmospheric pressure were measured over the entire compositional range. The excess molar volume, viscosity deviation and excess Gibbs energy for activation of the viscous flow of mixtures

Due to the extreme use of fossil fuels and increasing environmental problems, the steel industries have been always seeking solutions to decrease energy consumption. These efforts will not only reduce greenhouse gases (GHGs) but also decrease the costs of these industries. In this study, we investigated the effects of burners’ heating load distribution in a hot-rolling preheating furnace, by numerical

We discuss the effects of the recently proposed generalized (anti-)Snyder model on the thermostatistics of a classical ideal gas in the canonical ensemble and the blackbody energy spectrum. In the framework of this modified algebra, we calculate the modified partition function exactly and derive all thermodynamic quantities. The results show that the effects of the generalized (anti-)Snyder model become

Molten nitrate-based salts find potential use as a heat transfer fluid as well as thermal energy storage fluid in concentrating solar power plants primarily due to their relative inertness to construction materials and lower viscosities. It has been observed that ternary nitrate salt mixtures have lower melting points as compared to binary mixtures. One important property looked at during material

The measure of stability of sulfolane (SFL) in aqueous alkanolamine solution was investigated. For this purpose, degradation of SFL was experimentally studied under the stripping operational condition (T = 130 °C). The experiments were divided into two general categories: (1) aqueous solution of SFL with and without presence of oxygen to receive a sense of thermal and oxidative SFL degradation; (2)

The activity coefficient at infinite dilution for 47 selected organic solutes in 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) ionic liquid (IL) was determined at 303.15 K to 343.15 K through inverse gas chromatography (IGC). The partial molar excess enthalpy, entropy, Gibbs free energy at infinite dilution, and Hildebrand solubility parameters were obtained from the values of activity coefficient

Understanding working fluids flow and heat transfer in Enhanced Geothermal System (EGS) is critically important for assessing production capabilities and heat extraction rates from hot dry rock (HDR) effectively. Water is a conventional working fluid of EGS; therefore, it is necessary to study water–rock coupling heat transfer within HDR fractures. A single fracture is a basic element of complex fracture

This work has been dedicated to modeling the interfacial tension of hexane \(+\) alcohol mixtures in the temperature range of 283.15 K to 313.15 K. The cubic plus association equation of state is applied to the liquid–vapor phase equilibrium calculations. The binary interaction parameters are obtained according to the experimental phase equilibrium data. The linear gradient theory is used as a predictive

In this study, molecular dynamics method is used to estimate the atomic manner that effect on H2O/Cu Nanofluid behavior. The Copper Nanochannel with sphere barriers is simulated to study of H2O/Cu Nanofluid flow and the atomic interactions of these structures are described by Embedded Atom Model and Lennard-Jones force fields. For study of atomic behavior of these structures, physical parameters such

Simple equipment for measuring the coefficient of performance (COP) requires a basic thermodynamics approach and many coefficients of the gas state equation and saturated liquid line equation are affected by factors such as pressure, temperature, and volume. The coefficients used in these equations vary depending on the literature. In this study, the influence of a change in the coefficients on the

An amendment to this paper has been published and can be accessed via the original article.

We reported experimental measurements of the diffusion coefficient of methane at effectively infinite dilution in methylbenzene and in heptane at temperatures ranging from (323 to 398) K and at pressures up to 65 MPa. The Taylor dispersion method was used and the overall combined standard relative uncertainty was 2.3%. The experimental diffusion coefficients were correlated with a simple empirical

The flash method is a commonly used technique for estimating the thermal diffusivity of solid materials. In this work, we develop a new efficient formula for the thermal diffusivity calculation to process the flash method data in the case of heat losses at the rear and front faces. First, the transient heat equation is analytically solved using the Green functions under time-dependent convection boundary

Nanofluid is a solid–fluid mixture. By using one solid nanoparticle or one fluid, mono-nanofluid (MN) forms, and by using two solid nanoparticles (NPs) or two fluids, hybrid-nanofluid (HN) forms. For this study, for MN, copper oxide (CuO) and for HN, two solids, which are CuO and multi-walled carbon nanotube (MWCNT) were dispersed in base fluid which is water. After nanofluid preparation, thermal conductivity

This article provides an autobiographical account of many of my professional activities.

AbstractDensity and speed of sound of methane + n-heptane binary mixtures were measured at a temperature equal to 303.15 K and at pressures ranging from 10 MPa to 70 MPa. The measurements were performed in pure n-heptane and eight different mixtures with methane molar percentage ranging from 20 % to 95 %. Speed of sound data was obtained by a pulse-echo technique working at 3 MHz whereas density data

Although the drying processes have an important place in the textile industry in terms of drying or various textile finishing applications, they are considered as an expensive process in terms of energy and time consumed. Therefore, it is of great importance to simulate with mathematical models the drying behavior of a stenter (ram machine), one of the most preferred convection dryers in the textile

Moisture content can affect the thermo-physical properties of many materials. Thus sufficient knowledge of this parameter is required to improve product shelf life and quality, reduce waste or enhance process efficiency. The traditional loss on drying methods are still the go-to methods due to their robustness and simplicity. However, their inherent lack of selectivity imposes restrictions. These are

In this work, the conductance versus sweep frequency for AT-cut quartz crystal resonators was measured for methyl myristate, methyl oleate, and methyl linoleate under high pressure. The response of resonators immersed in methyl myristate at each temperature (313 K, 333 K, and 353 K) was obtained at pressures up to 140 MPa. The obtained values were nearly similar for both the fundamental mode and third

In the present study, the systematic evaluation of thermal properties was performed for CeO2–Gd2O3 (Gd2O3 = 0–15 wt%) samples. Gd2O3 doping into CeO2 reduced the grain size of CeO2–Gd2O3 solid solution and caused the expansion of the lattice parameter. The thermal conductivity of CeO2–Gd2O3 solid solutions decreased with increasing Gd2O3 content and decreased with temperature up to nearly 900 K, though

The present work resumes thermal data processing with most common algorithms in literature and introduces in addition a different data processing strategy, proposed to improve subsurface defect detection on industrial composites. These materials are successfully controlled with infrared Non-Destructive Investigations, since defects are easily detected by temperature response under thermal pulses with