DNS of Drag-Force and Reactive Mass Transfer in Gravity-Driven Bubbly Flows

Balcázar, Néstor; Antepara, Oscar; Rigola, Joaquim; Oliva, A.

doi:10.1007/978-3-030-42822-8_16

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Furthermore, regularizing the physical properties across the interface with the global level-set function, improves the numerical stability of the unstructured UCLS solver. Building upon our previous work [4,21,13,14], the presented results underscore the capability of the multi-marker UCLS method to effectively model bubbly flows with high-density ratios and high Reynolds numbers.…”

Section: Discussionsupporting

confidence: 66%

“…Previous verification, validation and extension of the UCLS solver include: gravity-driven bubbles [11,10,8,14,13,21], droplet collision [5], bubbly flows in vertical channels [21,14], falling droplets [22], thermocapillarity [20,23], liquid-vapor phase change [25,24], mass transfer in bubble swarms [4,14]. A comparison of the UCLS method [4,11] and unstructured VoF-LS method [26] was reported in [22].…”

Section: Numerical Experimentsmentioning

confidence: 99%

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Unstructured Conservative Level-Set (UCLS) method for reactive mass transfer in bubble swarms at high density ratio

Balcázar-Arciniega,

Rigola,

Oliva

2024

J. Phys.: Conf. Ser.

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This research presents a parallel Unstructured Conservative Level-Set (UCLS) method for reactive mass transfer in bubbles with a high-density ratio. This method uses the multiple-marker UCLS approach to circumvent the numerical coalescence of bubbles, combined with the finite-volume method to discretize transport equations on 3D collocated unstructured meshes. The fractional-step projection method solves the pressure-velocity coupling. The central difference scheme discretizes the diffusive term, whereas convective term within the momentum transport equation, level-set advection equations, and mass transfer equation are discretized by unstructured flux-limiters schemes. Such a combination of numerical techniques preserves the numerical stability in bubbly flows with a high Reynolds number and high-density ratio. Numerical and physical findings on the effect of physical properties ratios on the reactive mass transfer are reported, including their effect on the Reynolds number, interfacial area and Sherwood number.

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Section: Discussionsupporting

confidence: 66%

Section: Numerical Experimentsmentioning

confidence: 99%

Unstructured Conservative Level-Set (UCLS) method for reactive mass transfer in bubble swarms at high density ratio

Balcázar-Arciniega,

Rigola,

Oliva

2024

J. Phys.: Conf. Ser.

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“…Validations, verifications and extensions of the unstructured CLS method without phase change [10,15] have been reported in our previous works, for instance: buoyancy-driven rising bubbles [10,11,9,5,4], thermocapillary-driven motion of droplets [14,6], bubbly flows [13,9,15,16], falling droplets [8], binary droplet collision with bouncing outcome [13], bouncing collision of a droplet against a fluid-fluid interface [13], Taylor bubbles [26,27,4], gas-liquid jets [45], deformation of droplets under shear stresses [2,12], non-Newtonian two-phase flow [3], and mass transfer in bubbly flows [15,16,7]. Furthermore, a comparison of the unstructured CLS method [10] and coupled VoF-LS method [12] is reported in [8].…”

Section: Numerical Experimentsmentioning

confidence: 73%

Unstructured Level-Set Method For Saturated Liquid-Vapor Phase Change

Balcázar¹,

Rigola²,

Oliva³

2021

14th WCCM-ECCOMAS Congress

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A novel conservative level-set method for saturated liquid-vapor phase change on unstructured meshes is introduced. Transport equations are discretized by the finite-volume method on collocated unstructured grids. Mass transfer promoted by thermal phase change is computed using the energy jump condition at the interface, as a function of the temperature gradient. The fractional-step projection method is used for solving the pressure-velocity coupling, convective terms are discretized by unstructured flux-limiter schemes, central difference scheme is used for discretization of diffusive terms. Verification and validation cases have been undertaken to prove the accuracy and robustness of the numerical methods, including simulation of the Stefan problem, and film boiling on a cylindrical surface. Excellent agreement between numerical solutions against analytical solution and empirical correlations from the literature is reported.

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