What is the difference between mass transfer via convection and diffusion?

What is the difference between mass transfer via convection and diffusion?

The key difference between convection and diffusion is that convection is the large movement of a large mass of particles in the same direction through the fluid, whereas diffusion is the movement of single particles and transfer of particle’s momentum and energy to other particles in the fluid.

What is mass transfer by diffusion?

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 are the different 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 K in mass transfer?

where kp is the form of mass transfer coefficients based on partial pressure differences, p1 is the partial pressure of the SO2 in the bulk gas, and p1i is the partial pressure in the gas at the gas/liquid interface. This flux is also given by.

What is Fick’s Law of diffusion equation?

Fick’s First Law Movement of solute from higher concentration to lower concentration across a concentration gradient. J=−Ddφdx. Where, J: diffusion flux. D: diffusivity.

What’s the difference between diffusion and conduction?

There are two ways in which heat is moved. If the thermally vibrating molecules pass their kinetic energy to adjacent molecules, we call the process “conduction” and more generally, when the process is time-dependent, we call it “diffusion”.

What is the difference between dispersion and diffusion?

Dispersion is a process where particles get distributed evenly throughout a volume, whereas diffusion is a process where particles are separated from a larger structure. Diffusion is always an endothermic process, whereas dispersion is a process with no enthalpy change.

What are types of mass transfer?

Concentration profiles

• Mass transfer occurs because of gradient in what quantity? temperature. pressure.
• The two main types of mass transfer are. diffusion and conduction. convection and diffusion.
• A tank contains a uniform concentration of a chemical. The fluid in the tank is pumped into another tank.

What are the three types of mass diffusion?

Depending on the conditions, the nature, and the forces responsible for mass transfer, four basic types are distinguished: (1) diffusion in a quiescent medium, (2) mass transfer in laminar flow, (3) mass transfer in the turbulent flow, and (4) mass exchange between phases.