Simulation Of Turbulence Modification In Gas-liquid-particle Flows

Gas-liquid-particle three-phase flow is considered as one of the most important anddifficult point to deal with in multiphase flow. The main subject is two-phase flow,and three-phase flow is developing. In this paper, liquid is added to gas-particleturbulence flow to analyze the influence to gas-solid turbulence modification. It canprovide a theoretical basis for the research of gas-liquid-particle three-phase flow.Then3D simulation of gas-liquid turbulence flow passing over spheres is made byRANS modeling using Realizablek-turbulence model with fine grid nodes(onlylimit in Rep of particle not less than400). The results show that the joining of liquidcan slow down the recover velocity on the central line and enhances the spheretrailing vortex effect, and the magnitude of gas turbulence enhancement increaseswith the growth of the liquid void fraction.In the numerical simulation of gas-liquid two-phase flow around one or morespheres, the turbulence rule was studied under different liquid holdup, sphere diameter,inlet velocity, gas density, liquid density, gas viscosity, liquid viscosity, the distanceand position of spheres. It is found that the maximum of gas-liquid two-phaseturbulent kinetic energy appears in the leeward side of particles, and the two-phaseturbulence enhancement augments with the increase of liquid holdup, sphere diameter,inlet velocity, gas density, and liquid density, it decreases with the increases of gasviscosity, liquid viscosity and the distance of spheres.The results also show that the adding of liquid makes the maximum of gas turbulentkinetic energy appears in the windward side of the particles, but the gas turbulentkinetic energy in the leeward side is also larger than that of inlet, in other words, theparticle wake effect also can enhance gas turbulent kinetic energy in gas-liquidtwo-phase flow around one or more spheres. In the numerical simulation of gas-liquidtwo-phase flow around two or more particles, tangential velocity play an importantrole in turbulence modification of paralleling particles, while spanwise velocity is amain part to serial particles.