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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。
Aiming at the problem of low thermal conductivity in the process of thermoforming of viscous medium, a method of filling a certain amount of high thermal conductivity particles into the viscous medium is proposed to increase the thermal conductivity. Taking the pure aluminum particles as the research object, the particle size and the mass fraction of pure aluminum particles were determined by the sedimentation test of pure aluminum particles in viscous medium, the thermal conductivity measurement experiment of viscous medium with different filling parameters and the finite element analysis of heat transfer process Effect of viscous medium heat transfer process. The results show that the pure aluminum particles settle in viscous medium because the density of pure aluminum particles is larger than the density of viscous medium. The settling velocity increases with the increase of temperature and particle size. At the same time, And the increase of the mass fraction of filler, the thermal conductivity of viscous medium increases, which is conducive to the transfer of external heat to the viscous medium. Under certain temperature conditions, pure aluminum particles with proper particle size and mass fraction are selected as viscous medium Things, the viscous medium heat transfer performance improvement effect is more obvious.