Collect. Czech. Chem. Commun. 2003, 68, 2080-2092

Free Convective Mass Transfer at Isosceles Triangular Surfaces of Varying Inclination

Martin Kepperta, Josef Krýsaa,* and Anthony A. Wraggb

a Department of Inorganic Technology, Institute of Chemical Technology, Prague, Technická 5, l66 28 Prague 6, Czech Republic
b Department of Engineering, University of Exeter, North Park Road, Exeter EX4 4QF, U.K.


The limiting diffusion current technique was used for investigation of free convective mass transfer at down-pointing up-facing isosceles triangular surfaces of varying length and inclination. As the mass transfer process, copper deposition from acidified copper(II) sulfate solution was used. It was found that the mass transfer rate increases with inclination from the vertical to the horizontal position and decreases with length of inclined surface. Correlation equations for 7 angles from 0 to 90° were found. The exponent in the ShL-RaL correlation ranged from 0.247 for the vertical case, indicating laminar flow, to 0.32 for inclinations of 60 to 90°, indicating mixed or turbulent flow. The general correlation ShL = 0.358(RaL sin θ)0.30 for the RaL sin θ range from 7 × 106 to 2 × 1011 and inclination range from 15 to 90° was obtained.

Keywords: Free convection; Triangular surface inclined; Copper deposition; Laminar flow; Turbulent flow; Limiting diffusion current technique; Electrochemistry.

References: 12 live references.