Abstract
In this paper, the influence of the surface topography on the surface film resistance that occurs during mass transfer was investigated for earth plasters. Raw earth plaster samples have been made in order to achieve different surface topography. First, the mass transfer wet-cup procedure has been conducted on these raw earth plasters to determine the value of the surface film resistance Zs. Two wind tunnels have been designed to control the nature and the speed of the ventilation flow above the wet-cups to determine the influence of the flow and speed of ventilation on Zs. Results have shown that Zs was not depending on the ventilation speed in laminar mode and that is was about the size of the roughness Ra of the plaster. In a second time, the convective heat transfer coefficient h has been measured by a heat transfer experiment and a FEM model. The heat/mass transfer analogy from Chilton–Colburn has been used to estimate the surface film resistance during heat exchanges Zs∗. Results have shown that Zs and Zs∗ could not be compared.
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