Thermal Conductivity of Liquid Mixtures: Model of the Dependence on Concentration

Melkikh, Alexey V.; Скрипов, П. В.

doi:10.1007/s10765-022-03125-7

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…These 1–2 interactions introduce additional thermal resistances in the heat conduction, which are dependent on the composition for a given temperature. Attempting to interpret the thermal composition variation with compositions in binary liquid mixtures, Melkikh and Skripov (2023) proposed recently the Filaments Model, where the thermal conductivity of liquid mixtures dependence on concentration was constructed on the base of a connection in a series of the existing thermal resistances, the pure component thermal conductivities, λ1* and λ 2 *, the mass fractions of the components in the mixtures, w 1 and w 2 = 1 – w 1 , and a parameter γ, dependent on the mass ratio of the two components, m 1 and m 2 . In their model, the thermal conductivity of the mixture, λ, is given by eq λ = λ 1 λ 2 w 1 λ 2 + ( 1 − w 1 ) λ 1 where λ 1 and λ 2 are the values of the pure components, corrected by the presence of the other component (in essence correcting the interactions/thermal resistances by the presence of the different components of the mixture), given by eq .25ex2ex λ 1 = λ 1 * [ w 1 + false( 1 − w 1 false) γ ] λ 2 = λ 2 * [ false( 1 − w 1 false) + w 1 γ ] …”

Section: Resultsmentioning

confidence: 99%

Thermophysical Properties of 1-Ethyl-3-methylimidazolium Dicyanamide + Water: Understanding Interactions and Structure of Ionic Liquid + Water Systems

de Castro,

Lamas,

Magendran

et al. 2024

J. Chem. Eng. Data

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Ionic liquids with the dicyanamide anion, namely, with 1-alkyl-imidazolium cations have been receiving attention recently due to their potential applications. The utilization of these liquids as heat-transfer fluids, specifically in small heat exchangers and microchannels for microprocessor cooling, is presently deemed highly feasible, as it can be both more efficient and environmentally acceptable. The heat-transfer equipment design that uses fluids requires knowledge of their thermophysical properties. If one or more fluid properties are considered inadequate, additives may be introduced to improve the performance in key aspects. Water can be used to lower viscosity and thermal conductivity, for example, if the working temperature range allows for it. In this paper, we report the most comprehensive measurements of thermophysical properties of the pure 1-ethyl-3-methylimidazolium dicyanamide, [C 2 mim][N(CN) 2 ], and of its mixtures with water, in the whole concentration range, at P = 0.1 MPa. The properties measured were the density and speed of sound, electrical conductivity (293.15 < T/K < 343.15), thermal conductivity (293.15 < T/K < 353.15), and refractive index (293.15 < T/K < 343.15). Water-free values of the properties of the ionic liquid were obtained, following procedures previously developed. All the results obtained were analyzed and discussed in light of the current knowledge of the molecular structure and its effect on macroscopic behavior. Analysis of the ionicity of this aqueous ionic liquid mixture in the MacFarland scale shows that it is similar to that of [C 2 mim][CH 3 SO 3 ] but much higher than that of [C 2 mim][CH 3 COO]. For the pure ionic liquid, ΔW = 0.18, 82% of that of 0.01 M KCl, with an ionicity of 66%. The thermal conductivity of the mixture and its variation with composition at a given temperature was analyzed using the Filaments Model, which was not capable of reproducing the experimental points. The structural behavior of the water mixtures was found to be qualitatively similar to previous molecular simulation data and experimental data on other ionic liquid + water mixtures, solidifying the previously proposed picture of the structure of these binary mixtures, as composition and temperature vary. This type of macroscopic behavior can pave the way to several applications, namely, in the fields of heat transfer/storage and battery electrolytes.

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Section: Resultsmentioning

confidence: 99%

Thermophysical Properties of 1-Ethyl-3-methylimidazolium Dicyanamide + Water: Understanding Interactions and Structure of Ionic Liquid + Water Systems

de Castro,

Lamas,

Magendran

et al. 2024

J. Chem. Eng. Data

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Peculiarity of Superheated Hydrocarbons: Jump in Heat Transfer Due to Micro-additives of Moisture

Melkikh,

Skripov

2024

Int J Thermophys

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Characteristic Features of Heat Transfer in the Course of Decay of Unstable Binary Mixture

Igolnikov

Скрипов

2023

Energies

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This article is devoted to the study of the phenomenon of superheating of partially miscible mixtures having a lower critical solution temperature and the thermal effect accompanying the relaxation of an unstable mixture, within the framework of the problem of high-density heat flux removal. The study was carried out by using the method of the controlled pulse heating of a platinum wire probe. The characteristic heating time was from 0.2 to 180 ms. The superheating degree of the mixture relative to the diffusion spinodal exceeded 100 K. The heat flux density from the heater surface reached 13.7 MW/m2. The object of research was an aqueous solution of polypropylene glycol-425 (PPG-425). The obtained results clearly indicate that such mixtures can be used as coolants in processes where the possibility of powerful local heat release cannot be excluded. They also form the basis for expanding the phase diagram by involving in the study not-fully-stable and unstable states of the mixture.

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Thermal Conductivity of Liquid Mixtures: Model of the Dependence on Concentration

Cited by 3 publications

References 39 publications

Thermophysical Properties of 1-Ethyl-3-methylimidazolium Dicyanamide + Water: Understanding Interactions and Structure of Ionic Liquid + Water Systems

Thermophysical Properties of 1-Ethyl-3-methylimidazolium Dicyanamide + Water: Understanding Interactions and Structure of Ionic Liquid + Water Systems

Peculiarity of Superheated Hydrocarbons: Jump in Heat Transfer Due to Micro-additives of Moisture

Characteristic Features of Heat Transfer in the Course of Decay of Unstable Binary Mixture

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