双钨极TIG电弧-熔池传热与流动数值模拟*

王新鑫, 樊丁, 黄健康, 黄勇

NUMERICAL SIMULATION OF HEAT TRANSFER AND FLUID FLOW IN DOUBLE ELECTRODES TIG ARC-WELD POOL

WANG Xinxin, FAN Ding, HUANG Jiankang, HUANG Yong

表2 模拟用到的物理常数[19,25,43]

Table 2 Physical parameters used in the model[19,25,43]

Parameter Value Unit Radiative emissivity er 0.4 Boltzmann constant kB 1.381×10-23 J·K-1 elementary charge e 1.6×10-19 C Stefan-Boltzmann constant s 5.67×10-8 W·m-2·K-4 Permeability m0 4p×10-7 H·m-1 Latent heat L 2.47×105 J·kg-1 Ambient temperature T∞ 300 K Solidus temperature Ts 1673 K Liquidus temperature Tl 1723 K Density r 7200 kg·m-3 Thermal expansion coefficient β 10-4 K-1 Convection heat transfer coefficient hc 80 W·m-2·K-1