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This paper presents the measured convective mass transfer coefficients for humid air flowing above an initially dry gypsum and wood panel (equilibrium with 30 % RH air) in the transient moisture transfer (TMT) facility at the University of Saskatchewan. The convective coefficients are measured during laminar flow at three different Reynolds numbers (Re=800, 1500, and 2100) and with three different humidities in the air stream (50, 70, and 90 % RH). The results show that the measured mass transfer coefficients are lower than the values measured above an open water surface by Iskra and Simonson in a previous work. For gypsum, the convective mass transfer coefficient varies from 0.0016 to 0.0033 m/s (1.2×10−8 to 2.4×10−8 s/m) with 95 % confidence uncertainty bounds ranging from ±20 to ±57 %. For wood, the convective mass transfer coefficient varies from 0.0001 to 0.0008 m/s (9.4×10−10 to 5.7×10−9 s/m) with 95 % confidence uncertainty bounds ranging from ±50 to±300 %. The experimental data are analyzed with a 1-D heat and mass transfer numerical model to check the discrepancy with the experimental data. The uncertainty associated with an indirect determination of mass transfer coefficient is discussed.

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