Numerical prediction of nucleate pool boiling heat transfer coefficient under high heat fluxes

Pezo, Lato; Stevanović, Vladimir D.

doi:10.2298/tsci150701138p

Cited by 12 publications

(11 citation statements)

References 13 publications

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Section: Introductionmentioning

confidence: 89%

“…The present paper is an extension of the previous research presented in [15,16]. These papers are related to the numerical prediction of the Critical Heat Flux (CHF) [15] and the comparison of the boiling curve for high heat fluxes close to the CHF [16]. In [15,16] the heat transfer form the heated wall to the boiling two-phase mixture is predicted only at the locations of bubble nucleation, while the convective heat transfer in areas between bubble nucleation sites is neglected.…”

Section: Introductionmentioning

confidence: 95%

“…These papers are related to the numerical prediction of the Critical Heat Flux (CHF) [15] and the comparison of the boiling curve for high heat fluxes close to the CHF [16]. In [15,16] the heat transfer form the heated wall to the boiling two-phase mixture is predicted only at the locations of bubble nucleation, while the convective heat transfer in areas between bubble nucleation sites is neglected. The model applied in the present paper takes into account the convective heat transfer from the heated wall to the boiling two-phase mixture.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of nucleate pool boiling heat transfer

Stojanovic¹,

Stevanović

Petrović

et al. 2016

THERM SCI

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Multi-dimensional numerical simulation of the atmospheric saturated pool boiling is performed. The applied modelling and numerical methods enable a full representation of the liquid and vapour two-phase mixture behaviour on the heated surface, with included prediction of the swell level and heated wall temperature field. In this way the integral behaviour of nucleate pool boiling is simulated. The micro conditions of bubble generation at the heated wall surface are modelled by the bubble nucleation site density, the liquid wetting contact angle and the bubble grow time. The bubble nucleation sites are randomly located within zones of equal size, where the number of zones equals the nucleation site density. The conjugate heat transfer from the heated wall to the liquid is taken into account in wetted heated wall areas around bubble nucleation sites. The boiling curve relation between the heat flux and the heated wall surface temperature in excess of the saturation temperature is predicted for the pool boiling conditions reported in the literature and a good agreement is achieved with experimentally measured data. The influence of the nucleation site density on the boiling curve characteristic is confirmed. In addition, the influence of the heat flux intensity on the spatial effects of vapour generation and two-phase flow are shown, such as the increase of the swell level position and the reduced wetting of the heated wall surface by the heat flux increase.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of nucleate pool boiling heat transfer

Stojanovic¹,

Stevanović

Petrović

et al. 2016

THERM SCI

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“…The control volume based finite difference method is applied for the numerical solution of the set of balance Equations (8)- (10). A pressure-correction equation is derived according to the SIMPLE numerical method [17] from the momentum and mass balance equations.…”

Section: Methodsmentioning

confidence: 99%

Numerical study of heat transfer during nucleate pool boiling

Stojanović¹,

Stevanović²,

Petrović³

et al. 2016

Adv techn

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In this paper three-dimensional numerical simulation of the atmospheric saturated pool boiling was performed. The applied modelling and numerical methods enable full representation of the two-phase mixture behaviour on the heating surface with the inclusion of the swell level prediction. The three-dimensional investigation presented here was performed in order to take into account a convective heat transfer on the heated surface, as well as spatial effects of the vapour generation and a twophase flow such as phase dispersion within the two-phase mixture. The results are presented for a short period of time after the initiation of the heat supply and vapor generation on the heating surface. The replenishment of the heating surface with water and partial surface wetting for lower heat fluxes is shown. The influence of the density of nucleation sites and the bubble residence time on the wall on the pool boiling dynamics is discussed. Also, the influence of the heat flux intensity on the pool boiling dynamics is investigated. The applied numerical and modelling method showed robustness by allowing stable calculations for wide ranges of applied modelling boiling parameters.

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“…The use of nanofluid as an alternative of base fluid enhances the heat transfer coefficient applying the Lattice Boltzmann method [14,15]. The computational fluid dynamics (CFD) approach was used to forecast the heat transfer coefficient at a high heat flux [16]. The findings of numerical experiments were compared with calculated values applying empirical correlations and it was suggested that the heat transfer coefficient robustly depends on wall roughness.…”

Section: Of 20mentioning

confidence: 99%

Developing a Mathematical Model for Nucleate Boiling Regime at High Heat Flux

Danish

Mesfer

2019

Processes

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A mathematical model has been developed for heat exchange in nucleate boiling at high flux applying an energy balance on a macrolayer. The wall superheat, macrolayer thickness, and time are the parameters considered for predicting the heat flux. The influence of the wall superheat and macrolayer thickness on average heat flux has been predicted. The outcomes of the current model have been compared with Bhat’s constant macrolayer model, and it was found that these models are in close agreement corresponding to the nucleate pool boiling regime. It was concluded that the wall superheat and macrolayer thickness contributed significantly to conduction heat transfer. The average conduction heat fluxes predicted by the current model and by Bhat’s model are in close agreement for a thinner macrolayer of approximately 50 µm. For higher values of the wall superheat, which corresponds to the nucleate pool boiling condition, the predicted results strongly agree with the results of Bhat’s model. The findings also validate the claim that conduction across the macrolayer accounts for the main heat transfer mode from the heater surface to boiling liquid at high heat flux in nucleate pool boiling.

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Numerical prediction of nucleate pool boiling heat transfer coefficient under high heat fluxes

Cited by 12 publications

References 13 publications

Numerical investigation of nucleate pool boiling heat transfer

Numerical investigation of nucleate pool boiling heat transfer

Numerical study of heat transfer during nucleate pool boiling

Developing a Mathematical Model for Nucleate Boiling Regime at High Heat Flux

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