球状金属颗粒在流动熔体中熔化过程的数学模型

针对冶金过程中常涉及到的固态金属在液态金属中的熔化过程建立数学模型,用焓法描述相变过程,采用有限体积法,对过热熔体中球状金属颗粒熔化过程及其影响参数进行研究.结果表明,金属颗粒的熔化受颗粒初始温度、熔体过热度以及熔体流动强度的影响.熔体流动对相变影响作用较大,受周围流体对流强度的影响,颗粒从表面凝固壳形成到熔化过程呈现非均匀性,在靠近上游的颗粒前端以及下游尾迹处颗粒熔化速度较快,而颗粒边缘熔化速度较慢.

A mathematical model of melting process for spherical solid particles in a flowing melt

Aimed at the solid metal melting in the liquid melt, a mathematical model was built. The finite volume method was used to study the factors affecting the melting process of the spherical particle. The results indicated that the melting process is affected by the particle initial temperature, the melt superheat and the flowing strength of the liquid melt. The convection around the sphere has a big effect on the phase change process. From the solidification sheath formation on the melting process, there is an uneven situation. The melting rate on front and rear region is faster than that on edge of the particle.