Figure 3. Heat flow patterns on the sensitive film. The thermal conductivity are equal in the a- and b-directions but differs from its value in the c-direction. The above figure is a circle while the below one is an ellipse [11]

From

Heat Diffusion in an Anisotropic Medium with Central Heat Source

Mohammad Sameti, Alibakhsh Kasaeian

International Journal of Partial Differential Equations and Applications. 2014, 2(2), 23-26 doi:10.12691/ijpdea-2-2-1