激光诱导光栅技术测量磁性液体的热扩散系数

摘要

在室温和常压下采用激光诱导光栅技术实验测量不同体积分数的磁性液体的热扩散系数,体积分数分别为5%,6%,7%,8%,9%和10%。由于在磁性液体薄片上的升温非常小以及毫秒级的测量时间,自由对流所产生的影响可以忽略不计。用激光诱导光栅技术测的数据与已有文献中的实验数据比较吻合,从而说明该技术在磁性液体的热扩散测量上是可行的。%In this report, the experimental thermal diffusivity data are presented for different concentrations of ferrofluids. The thermal diffusivity measurements are conducted using a laser-induced thermal grating technique at room temperature and atmospheric pressure. The ferrofluids studied have volume fractions ranging from 5% to 10%. Because of the small temperature rise in the thin sample during the measurements and the very short measuring time of a few milliseconds, the influence of free convection can be ignored. The results show very good agreement with the experimental data in the openly published literatures, and thereby indicate the feasibility of the technique proposed in this report.