Multiphase Fluid Flow In An Atomization Process By Combined Liquid And Gas Flows

In rescent years,with the rapid development of aerospace、aotomobiles、mechanical and chemical industry and so on, the need of metal powder rawmaterial has greatly increased,this has promoted the metal powder preparationtechnology, international researchers work on developing new powderpreparation technology,in order to make powder species diversity, high yield,good quality, low price, and production process save more energy and protectenvironment. Atomization is an important traditional method to produce metalpowder. Predecessors make a lot of improvements in shuangliu atomizationmethods to develop a series of new atomization processs, CombinedAtomization Process by Liquid and Gas Flows combine traditional wateratomizaotion with gas atomization methods,because of the atomizationprocess relate to g-l、l-l multiphase flow phenomenon, Nowadays, people stillcann’t give a satisfied interpretation to it. Base on previous gas atomization simulation experiences this article uses numerical simulation method, aimingat multiphase flow interaction between water-air-steel.Through establishingEuler homogeneous multiphase flow mathematical model, simulations arecarried on respectively under different experimental conditions,then solvingresults are analyzed. First,cold flow field are simulated,and compare thesimulation result with the experiment;then simulate multiphase flow field withdifferent water spray angle and velocity,and conclude how thety effectatomization;finally got the best water spray angle that is benefit foratomization process.The article research result mainly has four aspects:（1）Based on the device of Combined Atomization Process by Liquid andGas Flows, the geometry model was drawn to display the l-g multiphase flows.Euler homogeneous multiphase flow model was use to describe the multiphaseflow interaction,k model was used to represent turbulence influence andfix buoyant effect, Scalable wall function was used to fix the wall influence.(2) Through compare the simulation result with experiment, result show:geometory and mathematical model established to simulation the multiphaseflow in Combined Atomization Process by Liquid and Gas Flows is available.(3) Constract the value of the air velocity and the area of the negativepressure,we get that the best water sprat angle is between45-50°.(4) Air velocity changed along the water spray angle and increased withthe water velocity,atomization process can be better if water spray velocity is increased.