Effect of subatmospheric pressures on heat transfer, vapor bubbles and dry spots evolution during water boiling

Surtaev, Anton; Serdyukov, Vladimir; Malakhov, Ivan

doi:10.1016/j.expthermflusci.2019.109974

Cited by 42 publications

(17 citation statements)

References 41 publications

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“…The main property of ITO is transparency in the visible range of wavelengths (380-750 nm) and opacity in the IR range (3-5 µm), which makes it possible to simultaneously record the irrigation pattern using video recording and measure the surface temperature using IR thermography. A similar heater design was previously used in experiments on liquid boiling [25][26][27] and has shown its high prospect for the simultaneous study of the evolution of the liquid-vapor system and the temperature field of the heating surface. The thickness of the used sapphire substrate was 400 µm and the thickness of the ITO film heater was 1 µm.…”

Section: Experimental Setup and Transparent Heater Constructionmentioning

confidence: 99%

“…An analysis of the presented results shows that this makes it possible to study in detail the dynamics of vapor bubbles, to carry out a detailed statistical analysis of the bubbles departure diameters, the emission frequencies, and the nucleation site density in a wide range of heat loads. Moreover, this recording format allows to study the dynamics of the triple contact line at the bubble base under various conditions [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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The Simultaneous Analysis of Droplets’ Impacts and Heat Transfer during Water Spray Cooling Using a Transparent Heater

Serdyukov

Miskiv

Surtaev

2021

Water

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This paper demonstrates the advantages and prospects of transparent design of the heating surface for the simultaneous study of the hydrodynamic and thermal characteristics of spray cooling. It was shown that the high-speed recording from the reverse side of such heater allows to identify individual droplets before their impact on the forming liquid film, which makes it possible to measure their sizes with high spatial resolution. In addition, such format enables one to estimate the number of droplets falling onto the impact surface and to study the features of the interface evolution during the droplets’ impacts. In particular, the experiments showed various possible scenarios for this interaction, such as the formation of small-scale capillary waves during impacts of small droplets, as well as the appearance of “craters” and splashing crowns in the case of large ones. Moreover, the unsteady temperature field during spray cooling in regimes without boiling was investigated using high-speed infrared thermography. Based on the obtained data, the intensity of heat transfer during spray cooling for various liquid flow rates and heat fluxes was analyzed. It was shown that, for the studied regimes, the heat transfer coefficient weakly depends on the heat flux density and is primarily determined by the flow rate. In addition, the comparison of the processes of spray cooling and nucleate boiling was made, and an analogy was shown in the mechanisms that determine their intensity of heat transfer.

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Section: Experimental Setup and Transparent Heater Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Simultaneous Analysis of Droplets’ Impacts and Heat Transfer during Water Spray Cooling Using a Transparent Heater

Serdyukov

Miskiv

Surtaev

2021

Water

Self Cite

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“…This interest relates to the fact that these characteristics are directly associated with the heat transfer rate and the development of crisis phenomena [1,2]. To study the local boiling characteristics a high-speed video recording is used most often [3][4][5][6][7]. The most convenient way to visualize the boiling process is high-speed video recording through a transparent heater [6,7] because such format of visualization, in contrast to side view visualization, allows you to observe each bubble on the surface of the heater.…”

Section: Introductionmentioning

confidence: 99%

“…To study the local boiling characteristics a high-speed video recording is used most often [3][4][5][6][7]. The most convenient way to visualize the boiling process is high-speed video recording through a transparent heater [6,7] because such format of visualization, in contrast to side view visualization, allows you to observe each bubble on the surface of the heater. This advantage simplifies the study of the abovementioned local boiling characteristics.…”

Section: Introductionmentioning

confidence: 99%

CNN-based visual analysis to study local boiling characteristics

Chernyavskiy

Malakhov

2021

J. Phys.: Conf. Ser.

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Visual analysis allows an estimate of different local boiling characteristics including bubble growth rate, departure diameters and frequencies of nucleation, nucleation site density and evolution of bubbles and dry spots in time. At the same time, visual determination of the presented characteristics in case of big amounts of data requires the development of the appropriate software which will allow not only determination of bubble location, but also an estimate of their sizes based on high-speed video. The presented problem can be solved by using the instance segmentation approach based on a convolutional neural network. In the presented work Mask R-CNN network architecture was used for estimation of the local boiling characteristics.

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“…Surtaev et al [12] experimentally investigated the influence of sub-atmospheric pressure on multiscale heat transfer during liquid pool boiling. Experiments were carried out in the pressure range of 8.8-103 kPa at saturated water boiling, obtaining simultaneously, an extensive data set of the effect of reduced pressure on the main characteristics of boiling, including heat transfer coefficients, nucleation site density, growth rate and departure diameter of vapor bubbles.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Model for Heat and Mass Transfer Evaluation of Vapor Bubbling

2020

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Multi-stage refrigeration systems cover a wide range of possibilities and are diffusing more and more. The idea that inspired this work derived from the need to have a tool to model the energy behavior of the intercooler inside a multi-stage refrigeration system. In this work, a semi-analytical model of a single bubble, injected into the liquid of an intercooler of a multi-stage system, has been developed. The developed model is a set of equations derived from the Fourier equation for heat conduction in defined conditions and includes the effects of sensible and latent heat. The vapor bubble is supposed to be injected in the saturated liquid contained in a tank at a defined depth, at an intermediate pressure. The model has been implemented in Matlab and the results show the influence of the liquid surface tension, the injection depth and the thermal diffusivity of the vapor. The model developed here is a useful low-cost tool for evaluating heat transfer optimization of a separator/intercooler of a multi-stage refrigeration system.

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Effect of subatmospheric pressures on heat transfer, vapor bubbles and dry spots evolution during water boiling

Cited by 42 publications

References 41 publications

The Simultaneous Analysis of Droplets’ Impacts and Heat Transfer during Water Spray Cooling Using a Transparent Heater

The Simultaneous Analysis of Droplets’ Impacts and Heat Transfer during Water Spray Cooling Using a Transparent Heater

CNN-based visual analysis to study local boiling characteristics

Semi-Analytical Model for Heat and Mass Transfer Evaluation of Vapor Bubbling

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