埋管铸造中流动液态介质物性对埋管外壁温度的影响  

Effect of Physical Properties of Flowing Liquid Medium on Embedded Tube Outer Wall Temperature in the Casting Process

作　　者：高增丽[1] 宫本奎[1] 牛建平 韩旭 刘运腾[3] GAO Zeng-li;GONG Ben-kui;NIU Jian-ping;HAN Xu;LIU Yun-teng(School of Materials Science and Engineering,Shandong University of Technology,Zibo 255049,Shandong,China;Hebei Wanfeng Metallurgical Spare Parts Co.,Ltd.,Zhangjiakou 076250,Hebei,China;Shandong Academy of Sciences,Jinan 250014,Shandong,China)

机构地区：[1]山东理工大学材料科学与工程学院,山东淄博255000 [2]河北万丰冶金备件有限公司,河北张家口076250 [3]山东省科学院,山东济南255014

出　　处：《铸造》2019年第6期599-602,共4页Foundry

基　　金：山东省自然科学基金(ZR2015EL035);淄博校城融合项目(2018ZBXC246)

摘　　要：在验证计算数值模型有效的基础上,研究了埋管铸造过程中冷却介质物性参数(热导率、粘度、比热)对预埋管外壁温度的影响。结果表明:随着热导率的减小,预埋管外壁的温度总体呈上升趋势,热导率低到一定程度,浇注过程中预埋管外壁温度会由于浇注过程中自由液面的波动出现温度震荡;冷却介质粘度越小,对流换热越强,预埋管外壁温度越低;冷却介质比热变化引起的预埋管外壁温度的轻微变化,主要是由于比热引起的冷却介质的温度变化所致,但是由于冷却介质在预埋管内的量相比浇注型腔空间内的液态高温铜量要小得多,因此预埋管内介质温度的变化对预埋管外壁温度的影响微弱。Based on the verified heat transfer model for the filling and solidification process of embedded tube, the influence of the physical parameters of cooling medium (thermal conductivity, viscosity and specific heat) on the outer wall temperature of the embedded tube in the casting process is studied numerically. The results show that the outer wall temperature of the embedded tube increases with the decrease of thermal conductivity, when the thermal conductivity decreases to a certain value, and the outer wall temperature oscillation of the embedded tube in the casting process occurs with the fluctuation of liquid copper free liquid level;the smaller the viscosity of cooling medium, the stronger the convective heat transfer between the cooling media and the embedded tube, the lower the outer wall temperature of the embedded tube;the change of specific heat of cooling medium has a weak influence on the outer wall temperature of the embedded tube, mainly due to the temperature change of the cooling medium caused by the specific heat, but the amount of cooling medium in the embedded tube is much lesser than that of liquid copper, so the change of medium temperature in the embedded tube has a weak influence on the outer wall temperature of the embedded pipe.

关 键 词：冷却介质 物性参数 外壁温度 冷却水套 埋管铸造 

分 类 号：TG242[金属学及工艺—铸造]