A numerical investigation of nucleate boiling at a constant surface temperature

Jia, Hongwei; Zhang, P.; Fu, Xin; Jiang, Siqiang

doi:10.1016/j.applthermaleng.2014.09.022

Cited by 34 publications

(13 citation statements)

References 30 publications

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“…This version of the model was used by Sielaff et al [48] to investigate horizontal merging of bubbles from two artificially controlled nucleation sites during boiling of refrigerant FC 72 on a stainless steel foil. A model very similar to the one presented in [42] was reported by Jia et al [49]. The authors introduced a modified height function in the VOF method in order to improve the evaluation of interface normal vector and decrease spurious currents.…”

Section: Micro-/meso-scale Simulations Of Boiling Based On Interface mentioning

confidence: 95%

Boiling heat transfer modelling: A review and future prospectus

Ilić¹,

Petrović

Stevanović

2019

THERM SCI

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This paper reviews the current status of boiling heat transfer modelling, discusses the need for its improvement due to unresolved intriguing experimental findings and emergence of novel technical applications and outlines the directions for an advanced modelling approach. The state-of-the-art of computational boiling heat transfer studies is given for: macro-scale boiling models applied in two-fluid liquid-vapour interpenetrating media approach, micro-, meso-scale boiling computations by interface capturing methods, and nano-scale boiling simulations by molecular dynamics tools. Advantages, limitations and shortcomings of each approach, which originate from its grounding formulations, are discussed and illustrated on results obtained by the boiling model developed in our research group. Based on these issues, we stress the importance of adaptation of a multi-scale approach for development of an advanced boiling predictive methodology. A general road-map is outlined for achieving this challenging goal, which should include: improvement of existing methods for computation of boiling on different scales and development of conceptually new algorithms for linking of individual scale methods. As dramatically different time steps of integration for different boiling scales hinder the application of full multi-scale methodology on boiling problems of practical significance, we emphasise the importance of development of another algorithm for the determination of sub-domains within a macro-scale boiling region, which are relevant for conductance of small-scale simulations.

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Section: Micro-/meso-scale Simulations Of Boiling Based On Interface mentioning

confidence: 95%

Boiling heat transfer modelling: A review and future prospectus

Ilić¹,

Petrović

Stevanović

2019

THERM SCI

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“…It is most common to take the liquid-vapour interface to be at the equilibrium saturation temperature at the system ambient pressure. (In a rather different approach [11], addressing largely refrigerants not water, some workers [12] have included deviations of the interface temperature from equilibrium, although micro-layer models did not feature in this analysis. )…”

Section: Current Modelling Of the Early Stages Of Vapour Bubble Develmentioning

confidence: 99%

Evaporative thermal resistance and its influence on microscopic bubble growth

Giustini

Jung

Kim

et al. 2016

International Journal of Heat and Mass Transfer

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Simulations of the formation of small steam bubbles indicate that the rate of growth of bubbles is very sensitive to the rate of evaporation of the micro-layer of liquid beneath the bubble. Such evaporation is rapid, and is modelled as being driven by the large heat flux through the thin liquid layer caused by the difference in temperature between the solid-liquid interface, and the saturation temperature in the interior of the bubble. However, application of this approach to recent experimental measurements of Jung and Kim generated anomalous results. In this paper we demonstrate that a model of the micro-layer heat flux that includes an allowance for the finite evaporative thermal resistance is able to eliminate these anomalies. This evaporative thermal resistance is a consequence of near-interface molecular dynamics, characterised by a quantity termed 'evaporation coefficient'. Whilst in most engineering applications evaporative thermal resistance is small compared to conductive resistance, here, with the micro-layer thickness ranging from a few microns down to zero, it becomes of considerable importance. Selection of a molecular 'evaporation coefficient' to restore consistency to the anomalous measurements allows a plausible numerical value to be inferred. For the several times and multiple locations studied, a fairly consistent value of between 0.02 and 0.1 is indicated, (for saturated water in laboratory conditions), which itself is consistent with earlier literature values of this rather difficult quantity. It is shown that the evaporative resistance always represents a large fraction of the conductive resistance, and for important phases of the process dominates it. The need for inclusion of this phenomenon in the microlayer models used in bubble analysis is clear.

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“…Another numerical attempt on the nucleated pool boiling with NCG was carried out by , in which the steady-state mass transfer of a non-deformable isolated vapor bubble was simulated. The mass transfer rate was derived by the Hertz-Knudsen-Scharge equation which was consistent with the expression of interfacial heat resistance (Zeng et al, 2015;Jia et al, 2015). The influence of the accumulation of NCG and the thermocappillary convection were taken into account in their study, and it was found that the NCG inhibits the vapor condensation and induced thermocappillary flow which in turn inhibits bubble detachment.…”

Section: Introductionmentioning

confidence: 58%

“…The phase change model, as shown in Table 1, was derived from the local superheat and the interfacial heat resistance Rint. In a previous paper, we used a modified model of this one by a smearing approach to maintain the numerical stabilization on simulation of pool boiling (Jia et al, 2015), and it was found that the model need the mesh with sufficient refinement. Overall, there is still lack of a universal phase change model on the bubble condensation for numerical simulations, and an efficient and accurate phase change model should be established accordingly.…”

Section: Introductionmentioning

confidence: 99%

Investigation of bubble behavior with phase change under the effect of noncondensable gas

Jia

Xiao

Kang

2019

Chemical Engineering Science

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An Arbitrary-Lagrangian-Eulerian based numerical method is proposed to study the phase change bubble under the effect of noncondensable gas (NCG). In order to validate the underlying mathematical model, benchmark tests, including the bubble growth in quiescent superheated liquid and the condensation of rising bubble with NCG, are conducted. The numerical results by the phase change model, in which the mass transfer rate is directly determined by interfacial heat flux, is found to agree fairly well with analytical results, and the calculation of fluid flow and heat transfer by the present numerical approach is reasonable. Moreover, the numerical results of free rising bubble condensation with NCG are found to present good agreement with the experimental data on the evolution of bubble size, and the mass balance of the NCGs is proved to be achieved by the model. Finally, the subcooled boiling with NCG on a biphilic surface is numerically investigated, and the bubble behavior and internal distribution of the NCG are studied in detail. In the presence of NCG, the bubbles can even depart from the walls that are negatively superheated. The bubble keeps the bowl-shape for a long time before necking, which is consistent with the experimental observations. The contact line is found to

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A numerical investigation of nucleate boiling at a constant surface temperature

Cited by 34 publications

References 30 publications

Boiling heat transfer modelling: A review and future prospectus

Boiling heat transfer modelling: A review and future prospectus

Evaporative thermal resistance and its influence on microscopic bubble growth

Investigation of bubble behavior with phase change under the effect of noncondensable gas

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