Attainable superheatings and stretchings of methane–hydrogen solutions

Байдаков, В. Г.; Kaverin, A. M.

doi:10.1016/j.ijheatmasstransfer.2020.120498

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Overviews on well-established methods and new results in the theoretical description of crystal nucleation in terms of CNT can be found, e.g., in [ 11 , 12 , 64 , 65 , 66 ]. Note also that pressure-induced nucleation [ 67 , 68 , 69 ] can be treated similarly to nucleation caused by changes of temperature both for nucleation at constant pressure and nucleation at constant rates of change of pressure as recently demonstrated in [ 70 , 71 , 72 ].…”

Section: Statistical Approach To Crystal Nucleationmentioning

confidence: 99%

Statistical Approach to Crystal Nucleation in Glass-Forming Liquids

Deubener

Schmelzer

2021

Entropy

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In this work, methods of description of crystal nucleation by using the statistical approach are analyzed. Findings from classical nucleation theory (CNT) for the average time of formation of the first supercritical nucleus are linked with experimental data on nucleation in glass-forming liquids stemming from repetitive cooling protocols both under isothermal and isochronal conditions. It is shown that statistical methods of lifetime analysis, frequently used in medicine, public health, and social and behavioral sciences, are applicable to crystal nucleation problems in glass-forming liquids and are very useful tools for their exploration. Identifying lifetime with the time to nucleate as a random variable in homogeneous and non-homogeneous Poisson processes, solutions for the nucleation rate under steady-state conditions are presented using the hazard rate and related parameters. This approach supplies us with a more detailed description of nucleation going beyond CNT. In particular, we show that cumulative hazard estimation enables one to derive the plotting positions for visually examining distributional model assumptions. As the crystallization of glass-forming melts can involve more than one type of nucleation processes, linear dependencies of the cumulative hazard function are used to facilitate assignment of lifetimes to each nucleation mechanism.

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Section: Statistical Approach To Crystal Nucleationmentioning

confidence: 99%

Statistical Approach to Crystal Nucleation in Glass-Forming Liquids

Deubener

Schmelzer

2021

Entropy

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“…Тематика актуальных исследований с использованием акустической кавитации довольно обширна. Например, обработка пищевых продуктов [3,4], процессы в сонохимии [5,6], воздействие на микроорганизмы и биологические вещества [7,8], литье металлов [9,10], медицина [11,12], фазовые переходы [13][14][15], а также продолжение исследования самих процессов кавитации [16,17]. Анализ процессов акустической кавитации обычно проводится на основе описания динамики кавитационных пузырьков и оценки порога кавитации для заданных внешних условий, параметров звукового воздействия и параметров жидкости [1,2,18,19].…”

Section: Introductionunclassified

Анализ Пороговых Параметров Начала Акустической Кавитации Жидкости В Зависимости От Частоты Ультразвукового Поля, Гидростатического Давления И Температуры

Смирнов¹,

Михайлова²,

Якупов³

et al. 2021

Журнал Технической Физики

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Проведено сравнение критерия инкубационного времени кавитации и классического критерия нестабильной кавитации. Показано, что критерий инкубационного времени кавитации может быть универсальной основой для оценки пороговых значений отрицательного давления в широком диапазоне частот колебаний звукового поля, при различных температурах жидкости и значениях гидростатического давления. В отличие от классического критерия он не требует информации о микропараметрах дефектной структуры материала. С другой стороны, комбинация двух критериев позволяет определить частотную зависимость диапазона радиусов активных кавитационных зародышей. Кроме того, обсуждена физическая сущность макропараметров жидкости, используемых в критерии инкубационного времени кавитации. Показано, что инкубационное время кавитации может быть связано с числом Гиббса и скоростью нуклеации зародышей кавитации. Ключевые слова: акустическая кавитация, ультразвук, пороговая амплитуда, критерий инкубационного времени.

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Influence of microadditive of carbon dioxide on the kinetics of boiling-up of superheated n-pentane

Perminov

Lipnyagov

Parshakova

2021

J. Phys.: Conf. Ser.

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The effect of a low-boiling impurity (CO2 gas <1.5% mol) on the kinetics of boiling-up of superheated n-pentane in a vertical glass tube have been studied by high-speed video (2050 fps). The method of continuous pressure decrease from 2.00 to 0.10 MPa (in the temperature range of 100.2-145.1 °C), as well as the method of measuring the lifetimes of superheated liquids at 0.10 MPa (90.2-134.1 °C) have been used. The inner surface of the tube has two visible defects, one of which defines the boundary of the attainable superheat. After degassing the system, the defects of tube cease to play an appreciable role, the active centers are redistributed. The temperature of the attainable superheat increases from the initial value by 20 °C in tests with gas and by 10 °C in subsequent tests without it. The result obtained may be related to physical gas adsorption on the glass surface during the process of evacuation of the system.

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Attainable superheatings and stretchings of methane–hydrogen solutions

Cited by 4 publications

References 17 publications

Statistical Approach to Crystal Nucleation in Glass-Forming Liquids

Statistical Approach to Crystal Nucleation in Glass-Forming Liquids

Анализ Пороговых Параметров Начала Акустической Кавитации Жидкости В Зависимости От Частоты Ультразвукового Поля, Гидростатического Давления И Температуры

Influence of microadditive of carbon dioxide on the kinetics of boiling-up of superheated n-pentane

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