Thermal Diffusivity Measurement of Ferrofluids by the Laser-induced Thermal Grating Technique

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.