Thermophysical Properties Of Liquids Research Articles

Erratum to “Prediction of elemental glass-transition temperatures of metals from thermophysical properties of liquids” [Journal of Non Crystalline Solids:X 2C (2019) 100016

Erratum to “Prediction of elemental glass-transition temperatures of metals from thermophysical properties of liquids” [Journal of Non Crystalline Solids:X 2C (2019) 100016

Thermo-physical properties of liquids and gases over a heated rotating disk

The motivation of this study arises due to huge occurrence of rotating disk in field of real-world processes like rotational air cleaner, turbomachinery, centrifugal pumps, aerospace engineering and chemical engineering. A numerical investigation is undertaken to study the thermo-physical properties of Newtonian fluid flow over a strongly heated rotating disk with temperature dependent viscosity. The solar radiative heat flux is considered in the heat equation. The temperature dependent viscosity and thermo-physical properties are assumed to explore the flow behavior. Numerical solutions of the converted boundary layer equations are then achieved by using fifth order Rung-Kutta Fehlberg integration approach with a shooting method. The attained results are discussed for mean flow profiles and physical interpretations of the problem are given through graphs and tables. It is observed that temperature dependence viscosity for liquids ranges to decrease the base flow profiles, whilst the gaseous viscosity nature has the opposite impact. The mass diffusion coefficient creates enhancement in concentration field. Moreover, correlations are plotted graphically in terms of temperature, concentration, and viscosity.

Thermophysical Properties of Liquids in Not Fully Stable States—From the First Steps to the Current Trends

The present article marks the 95th anniversary of the birth of Vladimir P. Skripov, author of the classic study of superheated and supercooled liquids. It presents a discussion based on the early work carried out by Skripov and his research team in Ekaterinburg during the 1950s and 1960s. Due to their pioneering nature, these works laid the foundation for the study of metastable liquid states. For various reasons, although they remain relevant to this day, these groundbreaking works remain unknown to most non-Russian-speaking readers. As well as elucidating the behavior of the heat capacity of a solution in the liquid–liquid critical region, the presented research also concerns the characteristic features of light scattering and free-convective heat transfer in the liquid–vapor critical region of a one-component system, discussing two options for the position of the superheated liquid spinodal on the phase diagram of water, including the area of supercooled states and negative pressures. The issues involved in the discussion are united by the fluctuating nature of such phenomena. Indeed, the very possibility of their experimental study is due to a significant increase in the scale of fluctuations of the corresponding quantities when approaching the critical point or spinodal. The ongoing development of the approaches proposed in these papers for solving contemporary problems in the thermophysics of superheated liquids is discussed.

Atomic-level breakdown of Green\u2013Kubo relations provides new insight into the mechanisms of thermal conduction

Precise control of thermophysical properties of liquids through tailor-made design of the liquid molecular structure is a goal that, if achieved, could have significant positive impacts on machine design, performance and durability. In this work we show how the breakdown of the Green–Kubo relations down to the atomic level in molecular dynamics simulation can give useful insight into the mechanisms of thermal conduction. Using a group of five small alcohols as a case study, we demonstrate how combining this level of insight with differential-structure analysis reveals the competition for conduction between carbon and hydroxyl group atoms, and show how this competition contributes to the change in thermal conductivity observed in experiment. We hope that this method will become a useful tool in the quest for molecular-structure based thermal design.

Prediction of elemental glass-transition temperatures of metals from thermophysical properties of liquids

Abstract Since extremely high quench rates (1012 to 1014 K/s) are normally necessary to form elemental metallic glasses, very few are known. Even when synthesized, very little is known about their properties because of the limited quantities of material produced under such extreme conditions. In particular, the glass transition temperature, Tg, of most of the elemental glasses are unknown. Here, predictions of Tg for many elemental metals are made based on the properties of the liquids. The basis for these predictions comes from a number of recently observed correlations in metallic alloy liquids between the liquid fragility, thermal expansion coefficient, rate of change of liquid structure with temperature, and cohesive energy. Using those quantitative correlations and the properties of elemental liquids, T g ′ s for several metallic elements are predicted. Where experimental data are available, they are in reasonable agreement with these predictions.

Method of Pressure Measurement Using an Experimental Setup for Investigating a Collection of Thermophysical Properties of Liquids and Gases

We describe a method of pressure measurement using a Kurant DI-V strain-gage sensor as part of an experimental setup for investigating the isochoric heat capacity and pVT property of liquids and gases. We compared the experimental measurement results with the readings of an MP-600 manometer and data from the National Institute of Standards and Technology (NIST, USA). The efficiency of the use of the indicated strain-gage pressure sensor is shown.

Investigation of Thermo Physical Properties of Liquids By Using Ultrasonic Method

To investigate the thermo physical properties of a liquid by varying temperature without altering its chemical composition. Physical properties influence the characteristics of the liquid. The main aim of this research was to determine the thermal conductivity of the liquids such as water, ethylene glycol, glycerin and benzene by using ultrasonic method and compare it with the standard values. These selected liquids are more commonly used as an additional agent in the already existing base liquid to enhance the heat transfer capabilities and also as base liquids in some applications. The thermal conductivity of these liquids greatly influences their usage in different applications. Basically their thermo physical properties are function of temperature, pressure, density and volume. Ultrasonic Interferometer was used to investigate the thermal conductivity, inter molecular free length and specific heat capacity by means of various theoretical relations. This ultrasonic method involving experimental setup makes use of 10 cc constant volume liquid sample taken for each analysis. It has been found that the frequency of ultrasonic waves (2 MHz and 4 MHz) also influence the thermal conductivity and it has been found that thermal conductivity increases with increasing frequency of ultrasonic waves. The experiment is carried out with different temperature and obtained wavelength is substituted to find the velocity of sound. Thermal conductivity obtained from these velocities using Bridgman relation coincides nearly with standard values, and the analysis is extended to find the free length and specific heat capacity using Schaaff relation. The conclusion of this research is that one thermo physical property can be theoretically determined by relation with other thermo physical properties.

Automated experimental facility to investigate a complex of thermophysical properties of liquids and gases

The process of investigation of a complex of liquid and gas thermophysical properties (heat capacity, PVT) by means of the Kh.I. Amirkhanov’s high-temperature adiabatic calorimeter is described. The technique of automation of that experimental facility by means of measuring and controlling devices and a personal computer is described as well.

Thermophysical and Acoustic Liquid Properties in the Framework of the Cluster Theory

A relation for the distribution function of clusters in a liquid, earlier proposed by the authors, allows one to find the number of particles in a cluster and its dependence on state parameters and to find the frequencies of IR-spectra of organic liquids. The authors have improved the method of finding the number of particles contained in a cluster. The proposed modification of the cluster theory allows one to estimate the energy of clusters, to reveal features of their structure, and to calculate the basic thermophysical properties of liquids, such as the difference of isobaric and isochoric heat capacities, the dynamic viscosity, and other properties. The authors have determined the cluster component of full absorption of ultrasonic waves, the cluster relaxation time, and the dimer formation energy for liquid noble gases and organic liquids. The comparison of the obtained results with experimental data demonstrates the reasonableness of the proposed model for prediction of thermophysical and acoustic properties of liquids.

A method and a device for measuring the thermophysical properties of liquids

Physical and mathematical models of a method of determining the thermophysical properties of liquids, the design of a measurement device, an automated system of scientific tests of thermophysical properties, and the results of an experimental determination of the thermophysical characteristics of liquid SKU PFL-74 rubber are examined.

Surface tension and evaporation: An empirical relation for water.

Several important phenomenological relations dealing with thermophysical properties of liquids are collected. It is shown that the Laplace ratio between the surface energy and the latent heat improves substantially if we add a volume-expansion term to the surface energy.

Evaluating the measurement error of thermophysical properties of liquids at high pressures by the periodic-heating compensation method

Evaluating the measurement error of thermophysical properties of liquids at high pressures by the periodic-heating compensation method

Thermophysical Properties of Liquids in the Metastable (Superheated) State

"Thermophysical Properties of Liquids in the Metastable (Superheated) State." Fusion Technology, 16(2), p. 279 Additional informationNotes on contributorsP. Clark SouersBS from Stanford University in 1960 and his PhD from the University of California, Berkeley in 1964, both in chemistry.

New automated apparatus for measuring the thermophysical properties of liquids by the method of periodic heating

New automated apparatus for measuring the thermophysical properties of liquids by the method of periodic heating

New method for determination of thermophysical property complexes of liquids at high state parameters

A high-speed nonsteady-state method for measurement of thermophysical properties of liquids at high state parameters is developed.

Thermophysical properties of liquids at high pressures

Most of the thermophysical properties of fluids are greatly altered at high pressures, and the studies of these changes are of much scientific and technological importance. In this paper, the effects of temperature and pressure on the density, viscosity, and thermal conductivity of various liquids are described briefly, based on recent experimental results from the author's laboratory. The objectives of this investigation, methods of measurements, and some of the experimental results are reviewed, as well as the present aspects in this field. Several important problems to be interpreted are also pointed out from the present measurements.

Possibility of measuring thermophysical properties of liquids in flows by the periodic heating method

The possibility of using the periodic heating method to measure thermophysical properties of liquids in flows is demonstrated.

An experimental investigation into the complex of thermophysical properties of liquids

A setup is described, intended for the measurement of a complex of thermophysical characteristics of liquids and gases. It is based on the method of registering the fluctuations of temperature of wire transducers heated by alternating current. The merits of the method are analyzed. The results of an investigation into the thermophysical properties of toluol and n-hexane are presented.

Tables on the Thermophysical Properties of Liquids and Gases. 2nd Edition, N. B. Vargaftik, Halsted Press, Division of John Wiley & Sons, Inc., New York, August, 1975. $49.50, 758 pages

Tables on the Thermophysical Properties of Liquids and Gases. 2nd Edition, N. B. Vargaftik, Halsted Press, Division of John Wiley & Sons, Inc., New York, August, 1975. $49.50, 758 pages