The nature of boiling during rewetting of surfaces at temperatures exceeding the thermodynamic limit for water superheat

Gomez, Camila; Geld, C.W.M. van der; Kuerten, Johannes G.M.; Liew, R Raoul; Bsibsi, M.; Esch, B.P.M. van

doi:10.1017/jfm.2020.232

Cited by 13 publications

(11 citation statements)

References 25 publications

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“…At surface temperatures above 250 -300 °C, a gentle temperature decrease and constant surface heat flux between 0.3 and 0.4 MW/m2 are observed. In this same temperature range, the borescope camera shows explosive boiling regime [7] and the side view camera shows strong water deflection, see Fig. 3a and 3c respectively.…”

Section: Resultsmentioning

confidence: 79%

“…The water jet system has been upgraded to allow for installation of both a circular jet nozzle of 9 mm diameter and a planar slit jet nozzle of 2x50 mm. As reported elsewhere [1], [7], a borescope and high speed camera arrangement enables the direct observation of the boiling activity in the jet stagnation zone. Additionally, a side view high speed camera is installed to record the jet and flow development on the complete test plate.…”

Section: Methodsmentioning

confidence: 85%

“…A schematic of the experimental setup is shown in Figure 1. The water system and high-speed cameras arrangement is as reported before [7]. The water jet system has been upgraded to allow for installation of both a circular jet nozzle of 9 mm diameter and a planar slit jet nozzle of 2x50 mm.…”

Section: Methodsmentioning

confidence: 99%

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The Run Out Table in the Lab: Quenching of Fast Moving Steel Plates

Gomez¹,

Geld²,

Kuerten³

et al. 2020

Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering

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In the Run Out Table, red hot steel slabs moving at speeds between 2 and 22 m/s are quench cooled by impingement of hundreds of water jets. Proper control of the Run Out Table process is crucial to ensure the desired steel microstructure and mechanical properties and can only be achieved with insight based on accurate experimental data. Although quenching experiments have been widely reported in literature, the few on moving surfaces reached maximum surface speeds of 1.5 m/s, which is much lower than in the actual Run Out Table process. In this paper, we present the first measurements with a new laboratory setup that allows surfaces to move at speeds between 0 and 8 m/s. To the best of our knowledge, this is the highest laboratory speed ever reported. The preliminary results show good reproducibility. Importantly, a transition in the heat flux history trends is found at speeds above 1.5 m/s. This finding confirms the need to perform experiments at surface speeds exceeding those of the past.

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Section: Resultsmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 85%

See 1 more Smart Citation

The Run Out Table in the Lab: Quenching of Fast Moving Steel Plates

Gomez¹,

Geld²,

Kuerten³

et al. 2020

Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering

Self Cite

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show abstract

“…Based on the fundamental understanding of the nucleation mechanism, new materials (both in terms of structure and functionality) can be developed with optimized functionality (i.e., e cient surface heat removal/exchange with the coolant). The boiling can be considered continuous evaporation upon the thermodynamic limit (above this limit, the liquid suffers instantaneous vaporization called explosive boiling 11 ). At the initial stage of the low-density gas phase nucleation in the high-density liquid phase, the interface is substantial/distinct.…”

Section: Introductionmentioning

confidence: 99%

Deciphering The Molecular Mechanism Of Water Boiling At Heterogeneous Interfaces

Karalis

Zahn

Prasianakis

et al. 2021

Preprint

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Water boiling control evolution of natural geothermal systems is widely exploited in industrial processes due to the unique non-linear thermophysical behavior. Even though the properties of water both in the liquid and gas state have been extensively studied experimentally and by numerical simulations, there is still a fundamental knowledge gap in understanding the mechanism of the heterogeneous nucleate boiling controlling evaporation and condensation. In this study, the molecular mechanism of bubble nucleation at the hydrophilic and hydrophobic solid-water interface was determined by performing unbiased molecular dynamics simulations using the transition path sampling scheme. Analyzing the liquid to vapor transition path, the initiation of small void cavities (vapor bubbles nuclei) and their subsequent merging mechanism, leading to successively growing vacuum domains (vapor phase), has been elucidated. The molecular mechanism and the boiling nucleation sites' location are strongly dependent on the solid surface hydrophobicity and hydrophilicity. Then simulations reveal the impact of the surface functionality on the adsorbed thin water molecules film structuring and the location of high probability nucleation sites. Our findings provide molecular-scale insights into the computational aided design of new novel materials for more efficient heat removal and rationalizing the damage mechanisms.

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“…A cyclic occurrence of explosive boiling and condensation happens. The duration of a flashing cycle is roughly proportional to the area of the flashing patch [2].…”

mentioning

confidence: 99%

Special Phenomena in Boiling

Geld¹

2020

Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering

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Nucleate boiling is one of the most efficient modes of heat transfer, yet many aspects of nucleate boiling are not well understood even today. Special aspects of boiling occur when • liquid is in contact with solid plates at temperatures exceeding the critical temperature • a boiling bubble grows isotropic and fast • other nucleation sites occur upstream. This presentation aims to highlight some unexpected experimental findings and to attempt physical explanations of them.

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The nature of boiling during rewetting of surfaces at temperatures exceeding the thermodynamic limit for water superheat

Cited by 13 publications

References 25 publications

The Run Out Table in the Lab: Quenching of Fast Moving Steel Plates

The Run Out Table in the Lab: Quenching of Fast Moving Steel Plates

Deciphering The Molecular Mechanism Of Water Boiling At Heterogeneous Interfaces

Special Phenomena in Boiling

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