Numerical investigation of the pool film boiling of water and R134a over a horizontal surface at near-critical conditions

Ningegowda, B.M.; Premachandran, B.

doi:10.1080/10407782.2016.1243930

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…Among these, diffuse interface models [22][23][24][25][26] are being developed with various levels of sophistication to account for unresolved mesoscale mixing, even if many challenges are still present regarding the validity of these closures. To investigate the details of separated flows, Eulerian interface capturing methods, such as level set (LS) [27], Volume of Fluid (VOF) [28], and Coupled Level Set and Volume of Fluid (CLSVOF) [29][30][31][32][33], have been progressively developed and improved, achieving nowadays high accuracy in mass conservation, surface tension force evaluation and phase change. However, all these models become numerically challenging and computationally expensive when large thermophysical properties variations are involved.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Transcritical and Supercritical Fuel Injections Using a Multi-Component Two-Phase Flow Model

et al. 2020

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In the present numerical study, implicit large eddy simulations (LES) of non-reacting multi-components mixing processes of cryogenic nitrogen and n-dodecane fuel injections under transcritical and supercritical conditions are carried out, using a modified reacting flow solver, originally available in the open source software OpenFOAM®. To this end, the Peng-Robinson (PR) cubic equation of state (EOS) is considered and the solver is modified to account for the real-fluid thermodynamics. At high pressure conditions, the variable transport properties such as dynamic viscosity and thermal conductivity are accurately computed using the Chung transport model. To deal with the multicomponent species mixing, molar averaged homogeneous classical mixing rules are used. For the velocity–pressure coupling, a PIMPLE based compressible algorithm is employed. For both cryogenic and non-cryogenic fuel injections, qualitative and quantitative analyses are performed, and the results show significant effects of the chamber pressure on the mixing processes and entrainment rates. The capability of the proposed numerical model to handle multicomponent species mixing with real-fluid thermophysical properties is demonstrated, in both supercritical and transcritical regimes.

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Transcritical and Supercritical Fuel Injections Using a Multi-Component Two-Phase Flow Model

et al. 2020

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“…Several researchers studied film boiling for water and many refrigerants experimentally and through computer simulations. − It was observed that interfacial instability plays a significant role in film boiling heat transfer. In such cases, it is generally guided by Rayleigh–Taylor instability.…”

Section: Introductionmentioning

confidence: 99%

Study of Cryogenic Film Boiling in the Presence of External Electric Field Using a Variant of Volume of Fluid-Based Interface Tracking Algorithm

Kumar

Hens

Lahiri

et al. 2022

Ind. Eng. Chem. Res.

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The study of film boiling of cryogenic fluids has become a topic of interest due to its applications in several areas, including electronic cooling and space vehicles. In this paper, numerical simulations were conducted to investigate the film boiling of liquid nitrogen using a variant of the volume of fluid (VOF)-based algorithm. The effects of wall superheats and electric fields on the bubble dynamics during film boiling at normal atmospheric pressure and near-critical conditions were investigated. It was observed that bubble formation during film boiling of liquid nitrogen at lower wall superheats was governed by Rayleigh−Taylor instability. However, at higher wall superheats, bubble spacing decreased with the appearance of additional bubbles. The average heat transfer rate increased with an increasing wall superheat. The electric field significantly influences the film boiling up to a specific limit of wall superheat. At a higher wall superheat, the influence of the electric field was suppressed by the enhanced thermal effect. It was observed that the impact of the electric field on film boiling is highly dependent on the dielectric permittivity difference between the liquid and vapor phases. Faster bubble detachment and reduced bubble spacing were noticed in the presence of an applied external electric field.

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“…Saha and Das [35] carried out the numerical simulation of boiling over wires with the VOF model in a three-dimensional domain. In addition, Tomar et al [36], Ningegowda et al [37], and Singh et al [38] used the coupled level-set and volume-of-fluid (CLVOF) method to model the film boiling on a horizontal flat surface. In recent years, the Lattice Boltzmann method has drawn great attention in the simulating of multiphase fluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Pool Film Boiling of Liquid Hydrogen over Horizontal Cylinders

Wang

2022

Energies

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Due to the low boiling point of hydrogen, the boiling phenomenon is usually encountered in the applications of liquid hydrogen. The underlying mechanism as well as the physical performance of film boiling over horizontal cylinders are not yet fully understood, especially for the various diameters. In this paper, pool film boiling of hydrogen over horizontal cylinders with diameters ranging from 0.2 to 30 mm is investigated based on the volume-of-fluid method. By the analysis of the gas–liquid interface evolution and the heat transfer mechanism, the cylinders are divided into wire heaters, transition heaters, and tube heaters. The results show that the heat transfer of the wire is affected by the evolution of a single bubble, while the heat transfer of the tube is mainly affected by the movement of multiple crescent-shaped gas structures along the surface. Besides, with the increase in cylinder diameter, the bubble detachment diameter increases, the heat flux decreases correspondingly, and the bubble growth period experiences a complicated principle.

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Numerical investigation of the pool film boiling of water and R134a over a horizontal surface at near-critical conditions

Cited by 12 publications

References 33 publications

Numerical Modeling of Transcritical and Supercritical Fuel Injections Using a Multi-Component Two-Phase Flow Model

Numerical Modeling of Transcritical and Supercritical Fuel Injections Using a Multi-Component Two-Phase Flow Model

Study of Cryogenic Film Boiling in the Presence of External Electric Field Using a Variant of Volume of Fluid-Based Interface Tracking Algorithm

Numerical Study on Pool Film Boiling of Liquid Hydrogen over Horizontal Cylinders

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