부산대학교 도서관

In this study, the wetting behavior of fluid onto the horizontal square rod array is numerically investigated. The dimension of the rod is referred to the actual stator coil of an automobile. The computational parameters are the gap of the rod and the viscosity to investigate the dependency of the structure and fluid property. The three-dimensional phase-field lattice Boltzmann method is used both for the fluid flow and phase transport. As the rod gap increases, the wetting rod number and area decrease, and the wetting in the axial direction of the rod becomes dominant. The liquid among rods supports the wetting to the spanwise direction at the narrow gap, but it disturbs the axial direction wetting at the wider gap. As for the viscosity, the higher viscosity induces less wetting area, and the capillary length among rods becomes longer. The dimensionless wetting area decreases until the threshold value of dimensionless number including both rod gap and viscosity, then it converges to the constant value. The heat removal per unit area is estimated by using an analogy.