冒口中热传递的方式有三种,即热传导、热对流和热福射。冒口形状不同、大小各异以及所采用的型砂热性能和液态金属温度不同,这三种热传递形式各占的比例也是不同的。对于明冒口来说,辐射和冒口周围型砂材料的传导吸热是热损失的主要部分;至于暗冒口,共热损失形式主要表现为冒口周围型砂材料的传导吸热。在常规的生产条件下,热对流所造成的热损失 There are three ways of heat transfer in riser, namely heat conduction, heat convection and heat radiation. Riser different shapes, different sizes and the use of sand thermal properties and liquid metal temperature is different, the proportion of these three forms of heat transfer are also different. For Ming riser, the conductive endotherm of radiation and riser around sand material is the main part of heat loss. As for the obscurant, the total heat loss mainly manifests as conduction endotherm of sand material around riser. Under normal production conditions, heat convection caused by heat loss