锻压技术

填充纯铝颗粒对热态粘性介质传热性能的影响

英文标题：Influence of filling pure aluminum particles on heat transfer property of warm viscous medium

作者：高铁军姚永杰吕阳杰刘青王忠金

分类号：TG306

出版年,卷(期):页码：2017,42(7):153-157

摘要：

针对粘性介质温热成形过程中导热率低的问题，提出了在粘性介质中填充一定量的高导热率颗粒的方法来提高其导热率。以纯铝颗粒为研究对象，通过纯铝颗粒在粘性介质中的沉降试验、不同填充参数的粘性介质导热率测量试验及传热过程的有限元分析，确定了纯铝颗粒粒径大小和质量分数对粘性介质传热过程的影响。研究结果表明：由于纯铝颗粒密度大于粘性介质密度，纯铝颗粒在粘性介质中存在沉降现象，沉降速度随温度的升高和粒径的增大而增加；同时，随着纯铝颗粒粒径的增大和填充质量分数的增加，粘性介质的导热率增大，有利于外部热量向粘性介质内部的传递；一定温度条件下，选择合适粒径和填充质量分数的纯铝颗粒作为粘性介质的填充物，对粘性介质传热性能的改善效果较为明显。

According to lower thermal conductivity of viscous medium in the warm forming process, filling high thermal conductivity particles into viscous medium was proposed to enhance the thermal conductivity of viscous medium during the warm forming process. For the pure aluminum particles, the influences of pure aluminum particle size and filling mass fraction on viscous medium heat transfer process was determined by the settlement experiment of pure aluminum particles, the measurement experiment of thermal conductivity for viscous medium with different filling parameters and the finite element analysis of heat transfer process. The results show that the settlement velocity of pure aluminum particles in viscous medium increases with the increasing of temperature and pure aluminum particles size, for the reason that the density of pure aluminum particles is greater than the density of viscous medium. At the same time, the thermal conductivity of viscous medium increases with the increasing of pure aluminum particles size and filling mass fraction, which is beneficial to the heat transfer from external to internal of viscous medium. At the certain temperature, the filling of pure aluminum particles can remarkably enhance the thermal conductivity of viscous medium at a proper size and filling mass fraction.

基金项目：

辽宁省自然科学基金资助项目(2013024014)；辽宁省高等学校优秀人才支持计划(LJQ2015083)

作者简介：高铁军(1977-)，男，博士，副教授，E-mail：gtj2572@sina.com

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