Transport Phenomena

The field of transport phenomena refers the exchange of mass, energy, or momentum between observed and studied engineering systems. This subject is a fundamental element disciplines concerned with the fluid mechanics, heat transfer and mass transfer. It is now well thought-out to be a part of the engineering discipline as much as thermodynamics, mechanics and electromagnetism. Momentum, heat and mass transport carve up a related mathematical framework and a similar analytical mechanism that bears out the exchange progression.  

Physical Adjustment in the Universe

Transport phenomena in fact comprise all agents of physical adjustment in the universe. Furthermore, it is considered to be elementary building block which urbanized the universe and which is accountable for the accomplishment of all life on earth. Nevertheless, the scope here restricts the transport phenomena to its rapport to non-natural engineered systems.

It is the irreparable processes of statistical nature stemming from the haphazard incessant motion of molecules, mostly observed in fluids. They engage a net macroscopic transfer of matter, energy or momentum in thermodynamic systems that are not in statistical equilibrium. Examples of transport processes comprise heat conduction, viscosity, molecular diffusion, radiation and electric charge transfer in semiconductors.

Wider Applications

Transport phenomena have broad application. For instance, in solid state physics the motion and interaction of electrons, holes and phonons are premeditated under transport phenomena. Another case is in biomedical engineering, where does transport phenomena of interest are thermoregulation, perfusion and micro-fluidics. In chemical engineering, transport phenomena are studied in reactor design, analysis of molecular or diffusive transport mechanisms.

The Presence of External Sources

The transport of mass, energy and momentum can be affected by the occurrence of external sources. An odor dissipates more bit by bit when the source of the odor remains at hand. The rate of cooling of a solid that is conducting heat depends on whether a heat source is practical. The gravitational force acting on a rain drop counteracts the haul imparted by the surrounding air.

A significant rule in the study of transport phenomena is analogy between phenomena. There are some remarkable similarities in equations for momentum, energy and mass transfer which can all be transported by diffusion, as illustrated by certain examples. Mass is the spreading and dissipation of odors in air is an instance of mass diffusion. Energy is the conduction of heat in a solid material is an example of heat diffusion. Momentum is the drag experienced by a rain as it falls in the atmosphere is an instance of momentum diffusion.

Questions:

• What are transport phenomena?
• State the role of transport phenomena.