Heat transfer at cooling high-temperature bodies in subcooled liquids

Yagov, V. V.; Zabirov, A R; Kanin, Pavel K.

doi:10.1016/j.ijheatmasstransfer.2018.05.018

Cited by 42 publications

(4 citation statements)

References 19 publications

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“…4. The experiments have qualitatively confirmed the approximate model proposed in [23], which determines the conditions of transition to the intensive heat transfer regime during film boiling of a subcooled liquid.…”

Section: Resultssupporting

confidence: 79%

“…Now the model does not take into account the effect of the coating structure on transition to the intensive cooling mode. It is reasonable to assume that, if the scale of roughness protrusions does not exceed the thickness of the vapor film, then the effect of the thermal properties of the surface is a stronger factor affecting the probability of appearing point contacts of the liquid with the wall, which was reflected in recent publications, e.g., [23,24]. In the future, we plan, within the framework of the developed approach, to conduct numerical simulation of the temperature distribution in two-layer metal-coating systems with intensive local cooling of the surface region in order to evaluate the effect of the structure, thickness, and properties of the coating on propagation of the cooling zone.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Coating by a Carbon Nanostructure on Heat Transfer with Unsteady Film Boiling

et al. 2019

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We present the results of an experimental study of heat transfer regimes during cooling in water of high-temperature, heated steel balls with a technically smooth and modified surface. The modification consisted of the application of a finely dispersed carbon coating to the surface followed by electron beam treatment. When the samples are placed in subcooled water, an intensive heat transfer regime occurs on the both samples; it appeared upon film boiling with heat fluxes on the surface up to 6 MW/m 2 . The heat flux values based on the initial cooling thermograms were obtained from a one-dimensional inverse heat conduction problem. The carboncoating leads to a decrease in the surface temperature, which corresponds to the transition to the intensive cooling mode, whereas the intensive cooling mode itself is identical for samples with the different surface treatments. Experimental results confirm the approximate model proposed for the conditions for the occurrence of the intensive cooling regime during film boiling of a subcooled liquid.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Effect of Coating by a Carbon Nanostructure on Heat Transfer with Unsteady Film Boiling

et al. 2019

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“…The mean absolute error (MAE) and the root mean square error (RMSE) were estimated to be 51.38 and 65.47%, respectively. A recent model by Yagov et al (2018) was developed for copper, nickel, and stainless steel spheres quenched in water at various degrees of liquid subcooling and under atmospheric pressure. The model not only covered a wide range of materials but also the effect of the coolant with an error of ±30%.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Minimum Film Boiling Temperature of Quenching Vertical Rods in Water Using Random Forest Machine Learning Algorithm

2021

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A great amount of research is focused, nowadays, on experimental, theoretical, and numerical analysis of transient pool boiling. Knowing the minimum film boiling temperature (Tmin) for rods with different substrate materials that are quenched in distilled water pools at various system pressures is known to be a complex and highly non-linear process. This work aims to develop a new correlation to predict the Tmin in the above process: Random forest machine learning technique is applied to predict the Tmin. The approach trains a machine learning algorithm using a set of experimental data collected from the literature. Several parameters such as liquid subcooling temperature (Tsub), fluid to the substrate material thermophysical properties (βf/βw), and system saturated pressure (Psat) are collected and used as inputs, whereas Tmin is measured and used as the output. Computational results show that the algorithm achieves superior results compared to other correlations reported in the literature.

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“…In 2017 scientific group governing by prof.Yagov proposed a model of incipience of highly intensive film boiling regime in subcooled liquid. In detail it presents in [12].The main idea of the model is that the liquid wave can periodically touch surface roughness protrusions; if their temperature appears to be lower than the attainable limiting temperature of a liquid (Tlim), the possibility of direct local contact between liquid and solid wall occurs. In this paper we present results on film boiling of water-ethanol mixture under high pressures.…”

Section: Introductionmentioning

confidence: 99%

Pressure influence on film boiling of mixtures

Zabirov¹,

Yagov²,

Kanin³

et al. 2019

Proceedings of the 6th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'19)

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A unique experimental work was carried out to study the laws governing the cooling of subcooled water-ethanol mixtures under pressures up to 0.5 MPa. The great intensification of quenching was recorded with increasing pressure and mass fraction of water in ethanol. At some conditions the transition temperature to the intensive boiling regime noticeably exceeded the critical temperature of the liquid (when direct liquid-solid contact is impossible).

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Heat transfer at cooling high-temperature bodies in subcooled liquids

Cited by 42 publications

References 19 publications

Effect of Coating by a Carbon Nanostructure on Heat Transfer with Unsteady Film Boiling

Effect of Coating by a Carbon Nanostructure on Heat Transfer with Unsteady Film Boiling

Prediction of the Minimum Film Boiling Temperature of Quenching Vertical Rods in Water Using Random Forest Machine Learning Algorithm

Pressure influence on film boiling of mixtures

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