摘要
确定适当的冷却制度,尤其是对水冷换热系数的研究,对于提高连铸坯质量意义重大,为此,建立了铝合金连铸过程中喷水冷却换热系数的二维计算模型,采用试验测试铸坯冷却过程温度场和计算机模拟相结合的方法,可以比较准确地计算出冷却水的换热系数hα。结果表明,换热系数随着喷水量的增加而增大;随表面温度的升高呈先增后减的趋势。铸坯表面温度为50~550℃、喷水量为2.0~3.8m3/h条件下,冷却水的换热系数hα=0.52(3759.61+24.39T-0.059T2)W0.94。
Heat transfer coefficient of cooling water h_α was calculated by experimental temperature field combining with simulated ones,in which estimated results of heat transfer coefficient of cooling water based on one-dimensional approximate difference method were employed by linear interpolation method.The results showed that heat transfer coefficient is increased with the augment of watering quantity,and earlier increased and then reduced with increase of surface temperature.The heat transfer coefficient h_α is equal to (0.52(3 759.61+)24.39T-0.059T^2)W^(-0.94) under conditions of surface temperature of 50～550 ℃ and the cooling water of 2.0～3.8 m^3/h.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第9期528-530,共3页
Special Casting & Nonferrous Alloys
关键词
连铸
铝合金
换热系数
沸腾换热
热流密度
Continuous Casting,Aluminum Alloy,Heat Transfer Coefficient,Boiling Heat Transfer,Heat Flux
作者简介
施鸿均，男，1977年出生，硕士研究生，上海大学材料科学与工程学院，上海（200072），电话：021-56334465，E-mail：ytyang@mail．shu．edu．cn
