Modeling for collective growth of fume primary particles with charge effect in arc welding
Modeling for collective growth of fume primary particles with charge effect in arc welding
复制标题
电弧焊中带有电荷效应的烟气一次粒子集体生长模型
DOI：
10.1007/s40194-017-0534-x
复制
发表时间：
2018
影响因子：
2.1
通讯作者：
Manabu Tanaka
中科院分区：
文献类型：
--
作者：
Masaya Shigeta;Shota Minami;Manabu Tanaka
建立了一个模型来计算由于与等离子体离子和电子碰撞而带电的烟雾初级粒子的集体生长。该模型还表达了任意形状的粒径分布，并在气溶胶动力学的基础上计算了颗粒通过均相成核、非均相凝结和混凝等方式集体生长的瞬态行为。利用该模型进行了数值计算，揭示了MIG焊接过程中颗粒形成的机理和电荷对生长过程的影响。结果发现，在典型的MIG焊接条件下产生的颗粒几乎都带负电荷。粒子电荷的作用对焊烟初级粒子的集体生长过程起着重要的作用，因为粒子电荷产生排斥的库仑力，阻止了粒子的凝聚生长。建议在研究MIG焊烟尘颗粒形成时考虑电荷效应。
A model is developed to calculate the collective growth of fume primary particles with charging due to collisions with ions and electrons from the plasma. The model also expresses a particle size distribution with any shape and calculates its transient behavior due to a collective growth of particles through homogeneous nucleation, heterogeneous condensation, and coagulation on the basis of aerosol dynamics. Using the model, numerical calculation is performed to reveal the mechanism of the particle formation and the charge effect on the growth process during MIG welding. In consequence, it is found that almost all particles generated in a typical condition of MIG welding are negatively charged. The effect of particle charge plays an important role on the collective growth process of primary particles of welding fume because the particle charge causes a repulsive Coulomb force which prevents the particles from growing by coagulation. It is recommended that charge effect should be taken into account for studying fume particle formation in MIG welding.