Figure 4.26: Width-averaged temperature profile of the projection temperature field inside a roll.

The tomographic reconstruction of the temperature field using two projections is considered next. The three fringe thinning algorithms are quantitatively evaluated. The three-dimensional temperature field in the fluid layer has been reconstructed using the MART algorithm. The MART algorithm converged asymptotically to a solution for all the three thinning algorithms. Since a correction corresponding to the average of all the rays passing through a pixel was used, a relaxation parameter of unity was used for reconstruction. A convergence criterion of 0.01%  between successive updates was employed for stopping the iterations. For each horizontal plane, the number of iterations required was in the range of 30 to 50.

Figure 4.27: Reconstructed temperature surface within the cavity at the central horizontal plane.

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