Electrochemical mass transfer to regular packings in a bubble column

The behaviour of regular packings constructed from corrugated metal sheets was investigated since they constitute an attractive packing material for the electrochemical absorption of gases. Mass transfer coefficients for the regular packing contained in a circular electrolytical cell were determined by the electrochemical method with simulation of the absorption process by bubbling nitrogen through the column. Correlations for the mass transfer rate as a function of fluid dynamic parameters and fluid properties are presented.List of symbols A electrode surface area (m²) - c ₀ bulk concentration (mol m^–3) - D diffusivity (m² s^–1) - E gas hold-up = volume fraction of gas - F Faraday constant (As mo^–1) - Fr Froude number = Vs ²/gL - g gravitational acceleration (m s^–2) - Ga Galileo number = L ³ g/v² - I limiting current (A) - mass transfer coefficient (ms^–1) - L characteristic length (m) - Re Reynolds number = V _s L/ - Sc Schmidt number = /D - Sh Sherwood number = L/D - St Stanton number = /V _S - V _S superficial gas velocity (ms^–1) - z valence change in electrochemical reaction - kinematic viscosity (m² s^–1)