What is mass transfer effect?
and (3) the mass transfer effect, which is caused by changes in CL structure and hydrophobicity, hindering the mass transfer of hydrogen and oxygen. From: Encyclopedia of Electrochemical Power Sources, 2009.
What is mass transfer with chemical reaction?
The phenomenon of “mass transfer with chemical reaction” takes place whenever one phase is brought into contact with one or more other phases not in chemical equilibrium with it. This phenomenon has industrial, biological and physiological importance.
What is mass transfer diffusion?
Diffusion, a Mass Transfer Phenomenon Diffusion is a mass transfer phenomenon that causes the distribution of a chemical species to become more uniform in space as time passes. In this case, species is a chemical dissolved in a solvent or a component in a gas mixture, such as the oxygen in air.
What is mass transfer limitations?
Mass transfer limitations occur when the diffusion rate of the molecules is lower than the reaction rate, leading to a decrease in reactor productivity. The latter leads to higher processing costs and should thus be avoided [1].
What is internal mass transfer?
13.2. Internal mass transfer limitation: refers to the catalyst structure and characterization that affects two factors [30]: • The diffusion of reactants and products in and out of the interior of the photocatalyst particle. • The light penetration inside the photocatalyst volume.
What is mass transfer and types?
Mass transfer is the net movement of mass from one location, usually meaning stream, phase, fraction or component, to another. Mass transfer occurs in many processes, such as absorption, evaporation, drying, precipitation, membrane filtration, and distillation.
What factors affect mass transfer rate?
Some important factors affecting the mass transfer rate, such as surfactant and its content, stirring speed, ratio of reagents, treating ratio and volume ratio of membrane phase to internal phase, have been studied. The breakage and the swelling of the emulsion have also been investigated.
What is external and internal mass transfer?
External mass transfer is determined by the flow conditions at construct surfaces, while the internal mass transport depends on molecular diffusion and convection, and the internal construct structure.
What is mass transfer limitation?
What is mass transfer kinetics?
Mass-transfer kinetics First, the analyte is transferred out of the bulk solution towards the sensor chip surface. Second, the binding of the analyte to the ligand takes place. The first step is also known as mass transfer and is carried out by convection and diffusion (1). Both events have their own rate constants.
What is meant by heat and mass transfer?
Heat and Mass transfer as the name suggests is based on the finding the rate of heat transferred through the medium such as by conduction, convection, radiation. By the virtue of the temperature difference between the two mediums.