Mass Transfer

Mass transfer is the net movement of mass from one location, usually meaning a stream, phase, fraction or component, to another. Mass transfer occurs in many processes, such as absorption, evaporation, adsorption, drying, precipitation, membrane filtration, and distillation. Mass transfer is used by different scientific disciplines for different processes and mechanisms. The phrase is commonly used in engineering for physical processes that involve diffusive and convective transport of chemical species within physical systems.

Some common examples of mass transfer processes are the evaporation of water from a pond to the atmosphere, the purification of blood in the kidneys and liver, and the distillation of alcohol. In industrial processes, mass transfer operations include separation of chemical components in distillation columns, absorbers such as scrubbers, adsorbers such as activated carbon beds, and liquid-liquid extraction. Mass transfer is often coupled to additional transport processes, for instance in industrial cooling towers. These towers couple heat transfer to mass transfer by allowing hot water to flow in contact with hotter air and evaporate as it absorbs heat from the air.

Read more about Mass TransferAstrophysics, Chemical Engineering, Analogies Between Heat, Mass, and Momentum Transfer

Other articles related to "mass, transfer, mass transfer":

Wet-bulb Temperature - Temperature Reading of Wet-bulb Thermometer
... initial water content of the air on a mass basis, is the saturated water content of the air, is the latent heat of water, is the initial air temperature, is the saturated air temperature and is the heat capacity of ... It turns out that as the drop cools, convective heat transfer begins to occur between the warmer air and the colder water ... not occur instantly, but instead depends on the rate of convective mass transfer between the water and the air ...
Churchill–Bernstein Equation - Mass Transfer Definition
... Sherwood number is the Schmidt number Using the mass-heat transfer analogy, the Nusselt number is replaced by the Sherwood number, and the Prandtl number is replaced by the Schmidt ... The same restrictions described in the heat transfer definition are applied to the mass transfer definition ... number can be used to find an overall mass transfer coefficient and applied to Fick's law of diffusion to find concentration profiles and mass transfer fluxes ...
Mass Transfer - Analogies Between Heat, Mass, and Momentum Transfer
... in the commonly used approximate differential equations for momentum, heat, and mass transfer ... The molecular transfer equations of Newton's law for fluid momentum at low Reynolds number (Stokes flow), Fourier's law for heat, and Fick's law for mass are very similar, since they are ... At higher Reynolds number, the analogy between mass and heat transfer and momentum transfer becomes less useful due to the nonlinearity of the Navier-Stokes equation (or more fundamentally, the general momentum ...
Sieving Coefficient
... In mass transfer, the sieving coefficient is a measure of equilibration between the concentrations of two mass transfer streams ... It is defined as the mean pre- and post-contact concentration of the mass receiving stream divided by the pre- and post-contact concentration of the mass donating stream ... where S is the sieving coefficient Cr is the mean concentration mass receiving stream Cd is the mean concentration mass donating stream A sieving coefficient of unity implies that the concentrations ...
Blue Straggler - Formation - Cluster Interactions
... The merger of two stars would create a single more massive star, potentially with a mass larger than that of stars at the main sequence turn-off point ... While a star born with a mass larger than that of stars at the turn-off point would have already evolved off of the main sequence, a more massive star ... measurably different from those of typical pulsating variables of similar mass and luminosity ...

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