Brazilian Journal of Physics
On-line version ISSN 1678-4448
DANTAS, A.L.L.; WALTON, D. and SHIBLI, S.M.. Collinear mirage effect measurement of the thermal diffusivity in ferrofluids. Braz. J. Phys. [online]. 1998, vol.28, n.4, pp. 00-00. ISSN 1678-4448. http://dx.doi.org/10.1590/S0103-97331998000400017.
Thermal diffusivity results obtained for different concentrations of the same ferrofluid are reported. The collinear mirage technique was used for its adequacy in obtaining the thermal properties of semitransparent materials with low thermal diffusivities. The results show that, as the ferrofluid concentration increases, the thermal diffusivity also increases, leading to a different trend compared to those reported for ferronematics. The different behaviors observed can be related to the different geometries of thermal waves propagating throught the material.