Accurate measurement of temperature and concentration distribution of a mixture in a rectangular parallelepiped enclosure

Thermal diffusion in the 50/50 wt.% binary hydrocarbon mixture of 1,2,3,4-tetrahydronaphthalene (THN)/dodecane (C12) at a mean temperature of 298 K was studied experimentally in two cells with different geometries. The thermal design of the geometries was investigated numerically, and the effect of the location of the filling channel was studied. The newer design showed a more linear temperature profile with smaller values of velocity than the earlier design. The thermal experimental results were in agreement with the numerical calculations. Unlike the previous design, the segregation of the components in the new design was not affected by convective motions, and the calculated Soret coefficient agreed with the benchmark values.