空心环形件电渣熔铸内结晶器的对流换热系数

"空心环形件电渣熔铸"内结晶器对流换热系数αin是衡量其内结晶器冷却效果的核心参数.本文将实测的内结晶器铜板水冷面温度、流体温度值代入基本算式求取并利用有限元分析验证来确定αin的取值范围,通过比照水平环形套管对流换热系数的经验公式来确定计算αin的经验公式.该经验公式用温差函数、效应因子、速度函数解析了内结晶器水模型温差、短管效应、内外径及高度等形状因素对αin的综合影响,提供了αin数据库建立的理论依据.

Heat Transfer Coefficient for ESR Inner Mold of Hollow Cylindrical Casting

ESR hollow cylindrical casting inner mold heat transfer coefficient α_○in is the core parameter to measure the effect of inner mold cooling. The range of α_○in was determined by inputting the measured values， including cooling surface temperature of the inner mold copper plate and water temperature， into basic formula and finite element analysis. The empirical formula for calculating α_in was determined by comparing with the empirical formula of heat transfer coefficient for annular casting. The experiential formula of α_○in explicates the effects of temperature difference， the short pipe effect and the shape factor of inner mold water model on α_in by using temperature difference function， effector and velocity function， which provides a theoretical basis for α_○in database establishment.