The Influence of System Pressure on Bubble Coalescence in Nucleate Boiling

Sielaff, Axel; Dietl, Jochen; Herbert, Stefan; Stephan, Peter

doi:10.1080/01457632.2013.830917

Cited by 24 publications

(7 citation statements)

References 19 publications

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“…However, Herbert et al [47] returned to the micro-layer model presented in [45] and extended it to account for the contact line motion during the impingement of a refrigerant F 72 droplet on a hot chromium surface. 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].…”

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

confidence: 99%

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: 99%

Boiling heat transfer modelling: A review and future prospectus

Ilić¹,

Petrović

Stevanović

2019

Therm sci

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“…As illustrated in Ref. [26], the nucleation site density increases with increasing pressure. On the surface of mesh number 140, the bubbles grow and cannot collapse at the free liquid-vapor interface, thus promoting the formation of a vapor film, and such a development could increase the thermal resist ance.…”

Section: Effect Of Meshmentioning

confidence: 92%

“…In the research Fig. 9 Heat transfer coefficient as a function of heat flux density for different mesh sizes [26], the results indicated that the occurrence of the bubble coales cence has a strong dependence on the pressure. The nucleation site density increased with increases in pressure.…”

Section: Effect Of Pressurementioning

confidence: 98%

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

Diao

Liu

Zhao

et al. 2014

Journal of Heat Transfer

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In this study, experimental investigations regarding the heat transfer performance of an evaporator with capillary wick are presented. The capillary wick structure is composed o f sintered multilayer copper mesh. The multilayer copper mesh was sintered on the cop per plate. With different combinations of mesh screens, the wick thickness of mesh 140 ranged from 0.6 to l.Omm, and those of meshes 60 and 140160 were both 1.0 mm. The operating pressures used in this study were 0.86 x 10s, 0.91 x 10s, 0.96 x 10s, 1.01 x 10s, and 2.0 x 10s Pa. The experimental results indicate that the heat transfer performance was strongly dependent on the thickness of the sintered mesh structure and on the mesh size. The operating pressure also has a strong influence on the evaporation/boil ing heat transfer performance of a mesh structure sintered using a single mesh size. How ever, it was also observed that the evaporationlboiling heat coefficient increased with an increase in the thickness of the capillary wick structure, which is less than l.Omm. The experimental results further illustrate that the composite sintered mesh structure was capable of properly enhancing the heat transfer performance, especially under high pressure. The maximum enhancement was 31.98%.

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“…A more detailed description of the entire setup, including a more detailed schematic of the experimental arrangement is presented in [33]. The thickness of the foil was chosen following the recommendations of [34].…”

Section: Experimental Arrangementmentioning

confidence: 99%

Bubble Dynamics and Heat Transfer on Biphilic Surfaces: Experiments and Numerical Simulation

et al. 2020

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Wettability is known to play a major role in enhancing pool boiling heat transfer. In this context bioinspired surfaces can bring significant advantages in pool boiling applications. This work addresses a numerical investigation of bubble growth and detachment on a biphilic surface pattern, namely in a superhydrophobic region surrounded by a hydrophilic region. Surface characteristics resemble bioinspired solutions explored in our research group, mainly considering the main topographical characteristics. This numerical approach is intended to provide additional information to an experimental approach, allowing to obtain temperature, pressure and velocity fields in and around the bubble, which help to describe bubble dynamics. The model was validated based on experimental data obtained with extensive image processing of synchronized high-speed video and high-speed thermographic images. The results obtained here clearly evidence that combining enhanced direct numerical simulations with high-resolution transient experimental measurements is a promising tool to describe the complex and intricate hydrodynamic and heat transfer phenomena governing pool boiling on heated biphilic surfaces.

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The Influence of System Pressure on Bubble Coalescence in Nucleate Boiling

Cited by 24 publications

References 19 publications

Boiling heat transfer modelling: A review and future prospectus

Boiling heat transfer modelling: A review and future prospectus

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

Bubble Dynamics and Heat Transfer on Biphilic Surfaces: Experiments and Numerical Simulation

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