Hydrodynamics and heat transfer in swirl flow under conditions of one-side heating. Part 2: Boiling heat transfer. Critical heat fluxes

Дедов, А. В.; Komov, A. T.; Varava, A. N.; Yagov, V. V.

doi:10.1016/j.ijheatmasstransfer.2010.05.035

Cited by 35 publications

(5 citation statements)

References 18 publications

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“…One should note that since the carbon removal is accompanied with an enhancement in the conductivity of the sample one can conclude that the removed carbon containing compound does not belong to the hexagonal structure of reduced graphene. Paper-like samples of partially reduced graphene oxide annealed at various temperatures can be used for surface nanocarbon coating in experiments on the surface reinforcement [1] and in studies in the thermal and mass transport at turbulent flow with boiling liquids in a vicinity of a rough surface [2]. A procedure of coating has been developed in [1].…”

Section: Methodsmentioning

confidence: 99%

“…Thus coating a steel surface with a soot obtained in an arc discharge with graphite electrodes remaining after extraction fullerenes following by high energy laser treatment results in a considerable (up to 6 times) enhancement of the microhardness of the surface [1]. Deposition of carbon nanostructures of the same origin combined with a laser or electron beam irradiation promotes a structural modification of the surface which is of interest in terms of the intensification of thermal transport in high power energy plants [2]. There has been developed a procedure of the thermal reduction of GO resulting in samples of different degree of reduction.…”

Section: Introductionmentioning

confidence: 99%

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Nanocarbon coating on the basis of partially reduced graphene oxide

Бочаров

Budaev

Елецкий

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. There has been developed an approach to the production of graphene as a result of the thermal reduction of graphene oxide (GO). GO has been synthesized by the use of the modified Hummers method with utilization of sodium nitrate and concentrated sulfuric acid. A paper-like material of 40 -60 µm in thickness and 1.2 g/cm 3 in density was formed on a filter after deposition from dispersion. The material was cut onto samples of about 15x25 mm 2 in size which were experienced to the thermal treatment at various temperatures between 100 and 800 о С. This resulted in a set of GO samples reduced to various degrees. The degree of reduction was determined on the basis of measurements of the conductivity. Along with that the evolution of samples density was studied as the annealing temperature was enhanced. The analysis of the X-ray photoelectron spectra of partially reduced GO permitted the determination of the dynamics of changing the chemical composition of the material in the process of the thermal treatment. The analysis of Raman spectra of the GO samples indicates rather high degree of the disordering of the material. A possibility of the usage of the material produced as a nanocarbon coating in experiments on the interaction of high intense liquid flows with a wall surface is discussed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanocarbon coating on the basis of partially reduced graphene oxide

Бочаров

Budaev

Елецкий

et al. 2017

J. Phys.: Conf. Ser.

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“…There are different heat transfer modes of the cooling wall along the circumferential direction, namely, the subcooled boiling in the upper part of the cooling wall and the single-phase convection in the lower part [11,12] . Due to the heat transfer enhancement in the nucleate boiling regime, the HTC in the nucleate boiling is much greater than that in the single-phase convection.…”

Section: Calculation Methodsmentioning

confidence: 99%

Numerical Calculation of the Peaking Factor of a Water-Cooled W/Cu Monoblock for a Divertor

Han

Hai-ping

Zhang

et al. 2015

Plasma Sci. Technol.

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In order to accurately predict the incident critical heat flux (ICHF, the heat flux at the heated surface when CHF occurs) of a water-cooled W/Cu monoblock for a divertor, the exact knowledge of its peaking factors (fp) under one-sided heating conditions with different design parameters is a key issue. In this paper, the heat conduction in the solid domain of a water-cooled W/Cu monoblock is calculated numerically by assuming the local heat transfer coefficients (HTC) of the cooling wall to be functions of the local wall temperature, so as to obtain fp. The reliability of the calculation method is validated by an experimental example result, with the maximum error of 2.1% only. The effects of geometric and flow parameters on the fp of a water-cooled W/Cu monoblock are investigated. Within the scope of this study, it is shown that the fp increases with increasing dimensionless W/Cu monoblock width and armour thickness (the shortest distance between the heated surface and Cu layer), and the maximum increases are 43.8% and 22.4% respectively. The dimensionless W/Cu monoblock height and Cu thickness have little effect on fp. The increase of Reynolds number and Jakob number causes the increase of fp, and the maximum increases are 6.8% and 9.6% respectively. Based on the calculated results, an empirical correlation on peaking factor is obtained via regression. These results provide a valuable reference for the thermal-hydraulic design of water-cooled divertors.

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“…Based on experimental measurements, they found that CHF at one-side heating in swirl flow is essentially higher than that under uniform heating condition. Dedov et al [5] conducted experiments in swirl flow under one-side heating conditions. Appropriate calculation formulas are derived.…”

Section: W Monoblcock and Cfc Monoblockmentioning

confidence: 99%

Critical heat flux analysis of divertor cooling flow channel in fusion reactor with CFD method

Wang

Guo

et al. 2022

THERM SCI

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Situated at the bottom of the vacuum vessel, the divertor extracts heat and ash produced by the fusion reaction, minimizes plasma contamination, and protects the surrounding walls from thermal and neutronic loads. The vertical targets of divertor are designed to be able for up to 20 MW/m2 high heat flux. It is a great ordeal for both the material performance and the cooling ability. Critical heat flux (CHF) margin is very crucial during the design of divertor. ANSYS FLUENT is used in this paper to predict the CHF on a monoblock structure with a twisted tape inside the tube. Numerical results are validated with the corresponding sets of experimental results. In this paper, CFD method used to predict CHF of divertor cooling channel was first introduced. On the other hand, influence of inlet subcooling on CHF is studied in detail. The inlet subcooling affect the CHF much complicated for the single- side heated and swirl flow channel. Whether the influencing trend or the locations of CHF occurrence are different under different inlet subcooling. The derivations between the simulation and experimental results were no more than 32%. This study proves the CFD tools can provide efficient help on the understanding of the CHF phenomenon of complex construction.

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Hydrodynamics and heat transfer in swirl flow under conditions of one-side heating. Part 2: Boiling heat transfer. Critical heat fluxes

Cited by 35 publications

References 18 publications

Nanocarbon coating on the basis of partially reduced graphene oxide

Nanocarbon coating on the basis of partially reduced graphene oxide

Numerical Calculation of the Peaking Factor of a Water-Cooled W/Cu Monoblock for a Divertor

Critical heat flux analysis of divertor cooling flow channel in fusion reactor with CFD method

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