What is mass transfer Slideshare?

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 causes convective mass transfer?

Convection is mass transfer due to the bulk motion of a fluid. For example, the flow of liquid water transports molecules or ions that are dissolved in the water.

What is free convective mass transfer?

Mass transfer by convection involves the transport of material between a boundary surface (such as solid or liquid surface) and a moving fluid or between two relatively immiscible, moving fluids.

What is the convective term?

The convective term (aka advective term) is transport of ϕ due to the fact that the fluid is moving: a single “particle” of ϕ will tend move around according to the velocity of the fluid around it.

What do you mean by nA in mass transfer?

Similarly, we can also define a mass flux of A, nA (units: mass of A/(area time) ), nA = ρA vA. (5) Here, vA is still the velocity of species A, exactly the same as in equation 1.

What are the modes of mass transfer?

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, adsorption, drying, precipitation, membrane filtration, and distillation.

What is Schmidt number used for?

Schmidt number (Sc) is a dimensionless number defined as the ratio of momentum diffusivity (kinematic viscosity) and mass diffusivity, and is used to characterize fluid flows in which there are simultaneous momentum and mass diffusion convection processes.

What is the convective term in the momentum equation?

Our velocity vector has three components; the stress tensor has nine components. Each component of the stress tensor is itself a second derivative of the velocity components. The terms on the left hand side of the momentum equations are called the convection terms of the equations.

What is convective mass flux?

An average vertical transport of mass for a field of cumulus clouds or thermals.

What is the difference between N and J?

The key difference between Newton and joule is that the unit Newton measures force while the unit joule measures energy. We denote Newton as N and joule as J. Moreover, Newton is a vector and joule is a scalar. This is another important difference between Newton and Joule.