Boiling Heat Transfer: An Overview of Longstanding and New Challenges

Shekriladze, Irakli G.

doi:10.1520/stp153420120013

Cited by 4 publications

(6 citation statements)

References 83 publications

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“…As known, the real heat transfer coefficient during transient nucleate boiling process is evaluated as a ratio of the heat flux density produced by bubbles to the overheat of the boundary layer [4,5] 1, the real HTC is almost 7 times larger as compared with the effective HTC [4,6]. Table 2 shows the real heat transfer coefficients in W/m 2 K which are responsible for developing temperature gradients during quenching of steel parts.…”

Section: Intense Quenching When Cooling In Low Concentration Of Water Polymer Solutionsmentioning

confidence: 99%

“…Calculations of HTCs were made for maximal critical heat flux density of water salt solutions which was equal to 15 MW/ m 2 [4]. Dimensionless correlations of authors [4,6] were used for this purpose. www.videleaf.com 3).…”

Section: Intense Quenching When Cooling In Low Concentration Of Water Polymer Solutionsmentioning

confidence: 99%

“…During transient nucleate boiling surface temperature of steel part maintains at the level of boiling point of a liquid insignificantly differs from it. The established new characteristics were used for developing austempering process via cold liquids [6] for reconstruction of surface temperature during nucleate boiling and for estimation the cooling difference between IQ-2 and IQ -3 processes (see Figure 1 9, temperature difference between IQ -2 and IQ -3 processes is insignificant. (see Table 10) that significantly differs these two situation from each other.…”

Section: Difference Between Iq-2 and Iq -3 Processesmentioning

confidence: 99%

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Uniform and Intense Cooling During Hardening Steel in Low Concentration of Water Polymer Solutions

Kobasko¹

2020

Prime Archives in Physics

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Section: Intense Quenching When Cooling In Low Concentration Of Water Polymer Solutionsmentioning

confidence: 99%

Section: Intense Quenching When Cooling In Low Concentration Of Water Polymer Solutionsmentioning

confidence: 99%

Section: Difference Between Iq-2 and Iq -3 Processesmentioning

confidence: 99%

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Uniform and Intense Cooling During Hardening Steel in Low Concentration of Water Polymer Solutions

Kobasko¹

2020

Prime Archives in Physics

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“…Data showing a virtually zero effect of a significant redistribution of the total heat flux between the various cooling mechanisms on the developed boiling heat transfer law are analyzed in the reviews [13,30]. Here, we can confine ourselves to an impressive example of the BCD [29], which is absent altogether in the boiling of a saturated liquid and is quite intense in the case of surface boiling of a highly subcooled liquid.…”

Section: The Mtd: Heat Transfer Controlled By Nucleationmentioning

confidence: 99%

Boiling Heat Transfer: Convection Controlled by Nucleation

Shekriladze¹

2018

Heat Transfer - Models, Methods and Applications

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Due to the peculiar way of evolution of boiling heat transfer research, a model "theater of director" (MTD), pumping effect of growing bubble (PEGB) and MTD-based universal correlation (UC) remain beyond the attention of researchers for more than half a century.In parallel, there are periodic fundamental events, demonstrating the irrationality of such indifference. Since the 1980s, not having found a way to enhance boiling heat transfer, other than that uncovered by the MTD-UC, high-performance boiling surfaces are being developed by artificially increasing effective radius (ER) of nucleation centers (bypassing the reference to the relevant theoretical basis). In 2009, an independent review declares transient conduction and microconvection as the dominant boiling heat transfer mechanism, not knowing that this is just the PEGB. In 2014-2017, the real versatility and accuracy of the UC is confirmed by independent studies, which involve extensive databases on the pool and flow boiling (with some interpretation problems). Assessing the current status of the study, the chapter emphasizes the complete fiasco of traditionally adopted approaches, models and theories, led to the dominance of purely empirical relationships written in a dimensionless form. Heat transfer research community is invited to gain will and rid of the heavy burden of the past.

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“…Developed boiling heat transfer turned out to be controlled regardless of the composition and inputs of involved individual cooling mechanisms. Fundamental character of the MTD is confirmed by the UC (Universal correlation) describing the experimental data on boiling heat transfer of all groups of liquids, including liquid metals and cryogens, during pool and channel flow boiling of saturated or subcooled liquid, including mini-and microchannels, without matching different constants and powers to different surface-liquid combinations [2,[4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Tabooed Universal Characteristic Length and Misled Boiling Heat Transfer Research

Shekriladze¹

2015

JPSA

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Abstract:The paper presents the next step within multiyear fruitless efforts of the author to overcome the absurd situation in boiling heat transfer research. The focus is made on the problem of the characteristic length of the process most clearly exhibiting the consequences of half a century ignoring the basic MTD (Model "theater of director"), the UC (Universal correlation) and some other boiling fundamentals. Echoing control of boiling heat transfer by nucleation, the MTD-UC identifies universal characteristic length, the AER (Average effective radius) of nucleation sites, equally workable at the macro-and microscale. Inefficiency of the generally accepted, so called MTA (theater of actors) is particularly pronounced just in the confusion with the characteristic length. Traditional and potential candidates, departure diameter of vapor bubble and transverse internal size of the channel hardly can be adjusted to independence of developed boiling HTC on mass acceleration, subcooling, liquid convection and the heating surface geometry. At the same time, even such a problem has not prevented many authors to develop tens or even hundreds of helpless MTA-based correlations. The ignoring the MTD-UC-AER has also led to the incompleteness of the standard boiling heat transfer experiment, which is usually done without studying nucleation sites (there are available only very few comprehensive experimental works including the data on the AER). The only exception was made for the problem of boiling heat transfer enhancement: over the past decades enhanced boiling surfaces were developed in direct accordance with the principle defined by the MTD-UC (just through the AER). Another thing is that the basic role of the MTD-UC-AER in substantial progress of the relevant R&D activities passed over in silence in the corresponding publications. Enviable unity and coherence of heat transfer community in preventing real scientific debate on the problem is also remarked.

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Boiling Heat Transfer: An Overview of Longstanding and New Challenges

Cited by 4 publications

References 83 publications

Uniform and Intense Cooling During Hardening Steel in Low Concentration of Water Polymer Solutions

Uniform and Intense Cooling During Hardening Steel in Low Concentration of Water Polymer Solutions

Boiling Heat Transfer: Convection Controlled by Nucleation

Tabooed Universal Characteristic Length and Misled Boiling Heat Transfer Research

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