ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-517-2
5-6th Thermal and Fluids Engineering Conference (TFEC)
DEVELOPING CAPABILITIES TO MODEL SOLID-LIQUID PHASE CHANGE IN COMPRESSIBLE FLOW USING COMPUTATIONAL FLUID DYNAMICS BASED METHODS
This work describes the capabilities of a computational fluid dynamics based technique developed to model solid-liquid phase change of a metal within a compressible gas flow. A Volume-of-Fluid based method is used where each phase of each material is treated as a different "fluid". Mechanical and thermal interactions between the compressible gas, the liquid metal, and the solid metal including solid-solid contact effects can be modeled with the developed methods. Solid entities are discretized so that solid-fluid interfaces can be treated as standard walls. General turbulence and radiation exchange models can be applied at the solid boundary, fluid induced forces and thermal loading at the fluid-solid interfaces to be directly calculated, and surface tension, contact angle, and adhesion effects to be directly incorporated. With the Volume-of-Fluid model, interactions between the gas, liquids, and solids can be directly captured including liquid droplet break-up. Physical solid boundaries may move as phase change occurs. Solidification and melting in the area between the solid/particles and along the flow path can be handled. The modeling technique is applied to study the solidification of molten material on surfaces of a cooler particle/flow path, the melting of a cooler particle/flow path as a result of contact with molten, heated metal material, the motion of particles though an air/droplet mixture, and the solidification of a "molten particle". The new method has the potential to provide for a more detailed analysis of the solid-liquid phase change and gas flow related processes and their local effects including erosion, fouling, or ablation of the flow path surfaces, phase change phenomena for heat transfer enhancement, cleaning methods, or even spray coatings, additive manufacturing, or other manufacturing processes. Hence, the method can provide a new means of studying phenomena that play critical roles in the operation or generation of engineering systems.