Ahmed A. Zatout

Mass transfer characteristics of gas-sparged fixed-bed electrodes composed of stacks of vertical screens

AbstractMass transfer rates at a gas-sparged fixed-bed electrode made of stacks of vertical screens were studied by measuring the limiting current for the cathodic reduction of potassium ferricyanide. Variables studied were air flow rate, physical properties of the solution and bed thickness. The mass transfer coefficient was found to increase with increasing air flow rate up to a certain point and then remain almost constant with further increase in air flow rate. Increasing bed thickness was found to decrease the mass transfer coefficient. Mass transfer data were correlated by the equation

Liquid-Liquid Extraction of Phosphoric Acid from Aqueous Solutions in Pulsed Columns

J = 0.2(ReFr)^{ - 0.28} ({L \mathord{\left/ {\vphantom {L d}} \right. \kern-\nulldelimiterspace} d})^{ - 0.28}

Smart utilization of jatropha ( Jatropha curcas Linnaeus) seeds for biodiesel production: Optimization and mechanism

For a single vertical screen electrode the data were correlated by the equation

Liquid-Solid Mass Transfer Behavior of a Vertical Array of Closely Spaced Horizontal Tubes in Relation to Catalytic and Electrochemical Reactor Design

J = 0.187(ReFr)^{ - 0.26}

Effects of Polyelectrolytes on the Diffusion of Low Molecular Weight Ionic Solutes

Mass transfer coefficients for an oxygen evolving vertical PbO2 coated cylinder electrode were measured for the anodic oxidation of acidified ferrous sulphate above the limiting current. Variables studied included the ferrous sulphate concentration, the anode height, the oxygen discharge rate and the anode surface roughness. The mass transfer coefficient was found to increase with increasing O2 discharge rate,V, and electrode height,h, according to the proportionality expressionK ∝V0.34h0.2. Surface roughness with a peak to valley height up to 2.6 mm was found to increase the rate of mass transfer by a modest amount which ranged from 33.3 to 50.8% depending on the degree of roughness and oxygen discharge rate. The present data, as well as previous data at vertical oxygen evolving electrodes where bubble coalescence is negligible, were correlated by the equationJ=7.63 (Re. Fr)−0.12, whereJ is the mass transferJ factor (St. Sc0.66).