Features of Supercritical Heat Transfer at Short Times and Small Sizes

Скрипов, П. В.; Rutin, Sergey B.

doi:10.1007/s10765-021-02869-y

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…As a result, the transition from the classical era in the history of critical phenomena to the period of the fluctuation approach to their description took place, following [43], at the Washington Conference in 1965 [51]. Later, in a short-term experiment, conditions were identified under which anomalies in thermophysical properties do not manifest themselves [52]. Generally, in the first work [19], the extremal course of light scattering h ready confirmed for a fairly wide vicinity of the critical temperature.…”

Section: Characteristic Features Of Light Scattering In the Critical ...mentioning

confidence: 99%

“…As a result, th from the classical era in the history of critical phenomena to the period of the approach to their description took place, following [43], at the Washington Co 1965 [51]. Later, in a short-term experiment, conditions were identified un anomalies in thermophysical properties do not manifest themselves [52].…”

Section: Characteristic Features Of Light Scattering In the Critical ...mentioning

confidence: 99%

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

Скрипов

2022

Energies

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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.

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Section: Characteristic Features Of Light Scattering In the Critical ...mentioning

confidence: 99%

Section: Characteristic Features Of Light Scattering In the Critical ...mentioning

confidence: 99%

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

Скрипов

2022

Energies

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“…The transition to the region of supercritical pressures (p > p c ) is accompanied by a change in the polarity of the response signal. The transition of a compressed fluid (p > p c ) to the region of supercritical temperatures (T > T c ), which is inhomogeneous with respect to the density of its structural elements, is characterized by a threshold decrease in the instantaneous heat transfer coefficient k(t) = q/∆T(t) [18]. Here, q is the heat flux density, and ∆T is the probe temperature rise.…”

Section: Problem Statementmentioning

confidence: 99%

Investigation of Binary Liquids in Unstable States—An Experimental Approach

Igolnikov

Rutin

Скрипов

2021

Liquids

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In this article, we present a methodology for conducting measurements based on pulse heating of a wire probe in partially soluble binary liquids. These liquids, which can be rapidly transferred to the region of unstable states above the diffusional spinodal, are novel research objects for the thermophysics of extreme states. Using the example of aqueous solutions of polypropylene glycol and glycol monobutyl ether having a lower critical solution temperature, the key hypothesis of the study on the general measurability of the properties of unstable solutions has been confirmed. The characteristic heating times from 1 to 15 milliseconds corresponded to the thickness of the heated layer comprising a few micrometers. The pressure was varied from units of MPa to 100 MPa. The conditions for the transition from measurements on pure components to those on solutions are formulated. The characteristic thermal patterns of the decay of unstable states depending on pressure and heating rate are revealed. The general possibility of using partially soluble binary liquids as a promising coolant in processes involving powerful local heat release is demonstrated.

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“…The present study sets out to obtain a specific picture of supercritical heat transfer in a non-idealised system [21] on the scale of small times and sizes and in the presence of high heat flux densities. In particular, experiments on conductive heat transfer with powerful local heat release have demonstrated an effect contrasting with the picture of near-critical heat transfer under stationary conditions [22,23]. This consists in a decrease in heat conduction with a rapid (units-tens of milliseconds) transfer of compressed liquid (p > pc, T < Tc) to the region of supercritical (hereinafter, SC) temperatures (T > Tc) along the SC isobar p > pc.…”

Section: Introductionmentioning

confidence: 99%

“…The visibility of the results is ensured by operating with the primary data of the experiment, which is free from model limitations. Following [24], it has been suggested [22] that under conditions of high heat flux densities, temperature gradients, and short response time of the heat-releasing surface, the property anomalies known from stationary measurements do not manifest themselves. Thus, the present paper is devoted to clarifying the understanding of supercritical heat transfer in a nonidealised system at the microscopic level.…”

Section: Introductionmentioning

confidence: 99%

Model of Non-stationary Heat Transfer in a Supercritical Fluid

2023

Self Cite

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This paper continues the process of reconciling results obtained when investigating heat transfer in the supercritical liquid-vapour region inherent in stationary and fast processes. A relatively simple model of nonstationary heat transfer at the microscopic level in a non-idealised system is constructed. The model provides a possible explanation for the increase in the thermal resistance of a supercritical fluid (drop in heat conduction) at a not too great distance from the critical isobar on a scale of small characteristic times and sizes. The model is based on an explicit account of a significant decrease in thermal diffusivity when approaching the critical temperature of the substance. The simulation results are compared with experimental data on the rapid (lasting in units-tens of milliseconds) transfer of a compressed liquid to the supercritical temperature region along a supercritical isobar.

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Features of Supercritical Heat Transfer at Short Times and Small Sizes

Cited by 10 publications

References 24 publications

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

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

Investigation of Binary Liquids in Unstable States—An Experimental Approach

Model of Non-stationary Heat Transfer in a Supercritical Fluid

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