Convection in multiphase flows using Lattice Boltzmann methods

Abstract

We present high resolution numerical simulations of convection in multiphase flows (boiling) using a novel algorithm based on a Lattice Boltzmann method. We first validate the thermodynamical and kinematical properties of the algorithm. Then, we perform a series of 3d numerical simulations at changing the mean properties in the phase diagram and compare convection with and without phase coexistence at $Ra\sim 10^7$. We show that in presence of nucleating bubbles non-Oberbeck Boussinesq effects develops, mean temperature profile becomes asymmetric, heat-transfer and heat-transfer fluctuations are enhanced. We also show that small-scale properties of velocity and temperature fields are strongly affected by the presence of buoyant bubble leading to high non-Gaussian profiles in the bulk.

5 pages, 3 figures

References in corpus (3)

• Lattice Boltzmann method for thermal flow simulation on standard lattices
• Enhanced heat transport by turbulent two-phase Rayleigh-Bénard convection
• Non-Oberbeck-Boussinesq effects in turbulent thermal convection in ethane close to the critical point

Cited by in corpus (26)

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• Discrete Boltzmann multi-scale modeling of non-equilibrium multiphase flows
• Heat transport in boiling turbulent Rayleigh-Bénard convection
• Lattice Boltzmann modeling of self-propelled Leidenfrost droplets on ratchet surfaces
• Lattice Boltzmann modeling and simulation of forced-convection boiling on a cylinder
• Particles-on-Demand for Kinetic Theory
• How does boiling occur in lattice Boltzmann simulations?
• Effect of the forcing term in the pseudopotential lattice Boltzmann modeling of thermal flows
• Enhancement of nucleate boiling by combining the effects of surface structure and mixed wettability: A lattice Boltzmann study
• Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy driven bubbly flows
• Hybrid Lattice Boltzmann/Finite Difference simulations of viscoelastic multicomponent flows in confined geometries
• An experimental study on the multiscale properties of turbulence in bubble-laden flows
• Improved three-dimensional thermal multiphase lattice Boltzmann model for liquid-vapor phase change
• Enhancing Heat Transport in Multiphase Rayleigh-Bénard Turbulence by Changing the Plate-Liquid Contact Angles
• Scale-dependent anisotropy, energy transfer and intermittency in bubble-laden turbulent flows
• Rayleigh-Bénard convection of a model emulsion: anomalous heat-flux fluctuations and finite-size droplets effects
• Evaporating Rayleigh-Bénard convection: prediction of interface temperature and global heat transfer modulation
• Analysis of the heat transfer fluctuations in the Rayleigh-Bénard convection of concentrated emulsions with finite-size droplets
• Role of interfacial stabilization in the Rayleigh-Bénard convection of liquid-liquid dispersions
• Mechanics of cooling liquids by forced evaporation in bubbles
• Multiscale analysis of the particles on demand kinetic model
• Dynamical regimes of thermally convective emulsions