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The same behavior was observed in all the walls for wind speeds of 6, 8 and 10 m/s. Employing Eq. (2) to calculate the hydrodynamic boundary layer thickness and considering that Pr = 0.708, we obtained a 0.0037 m thickness. If we used Eq. (3), the thermal boundary layer thickness was 0.0041 m, representing an 8.8% discrepancy compared to the 0.0045 m experimental result. This discrepancy is easily explainable by two factors, the roughness of the wall surface and the error in measurements of the vertical distance between the sensors system and wall surface.