锌液冷却管三维温度场有限元分析

FINITE ELEMENT ANALYSIS OF THREE DIMENSION TEMPERATURE FIELD FOR COOLING PIPE IN LIQUID ZINC

根据锌液冷却管所处的工作条件,建立了锌液冷却管三维温度场的数学模型,描述了冷却管的换热机制,计算了对流换热系数。通过有限元分析,定量地确定了冷却管在使用中的温度分布,定性地确定了冷却水流速、冷却管壁厚等的影响规律。分析结果表明:冷却管管壁温度沿径向变化大,且由热面至冷面呈直线下降,沿周向变化较小,在直管和弯管的连接处温度变化剧烈;在一定范围内,冷却管的冷面温度随着冷却水的水流速度的增加而降低;冷却管壁厚的变化对冷却管温度分布的影响是复杂的,在一定条件下,存在一个最佳的壁厚。

In this paper,the numerical model of three-dimension temperature field of the cooling pipe was built by describing the mechanism of heat exchange and calculating the convection exchange heat coefficient according to the work condition of the cooling pipe in liquid zinc.By using finite element analysis,the distribution of temperature was quantitatively determined and the influence discipline of the factors,such as the fluid velocity of the cooling water and the width of the cooling pipe,was qualitatively analyzed.The results show that the temperatures of cooling pipe change greatly along radial direction and decrease along a line from heat surface to cold surface,while the temperatures of perimeter direction change little.The results also show that the temperatures at the joint of straight part with curve section change greatly,and that the temperatures of the cooling pipe decrease accompanying the increase of the velocity of water flow in a certain scope.It is suggested that the affecting of the width of cooling pipe towards the distribution of temperatures is complex and that there is an optimum width in a certain condition.