Definition - What does Flux mean?

Flux is a common phenomenon throughout the natural world and has become a ubiquitous concept throughout physics and mathematics, and hence technology. Flux describes the flow of a physical property through space and is often coupled with a time variation. There are two common usages or contexts for flux, each having solid mathematical frameworks – flux as a vector in the context of transport phenomena and flux as a scalar quantity in the context of electromagnetism.

Techopedia explains Flux

Flux is a general term which refers to the flow of a physical quantity through space such as electromagnetic waves. The word comes from the Latin word "fluxus," which means flow and was first introduced by Isaac Newton into differential calculus as "fluxion."

In transport phenomena such as heat transfer and fluid dynamics, flux is considered the "rate of flow of a property per unit area," which has the dimension of quantity and time. For example, the amount of water flowing per square area of a river and the amount of light that hits an area per second are considered types of flux.

Examples of transport fluxes include:

  • Heat flux – The rate of flow of heat in a specific area
  • Momentum flux – The rate of momentum transfer per unit area
  • Mass flux – The rate of mass flow across a unit area
  • Energy flux – The rate of transfer of energy through a unit area

In electromagnetism, force fields and like phenomena, flux is considered as a surface integral and is the energy that flows around or through an electrically charged object. In this case, the simplest way to think of flux is the amount of air moving through a tube. If the wind speed is high and the tube opening (the area) remains constant, the amount of air that flows through is greater. In order to maintain the air speed and increase the amount of air flowing through, then the opening must be enlarged. The flux density is simply how close flux lines are to each other. In the first scenario where there is a smaller tube opening, the flux density is bigger, while when the area of the opening is increased, the flux density becomes less because each flux line is further from each other or from the radiating object, while the quantity remains constant.

Share this:

Connect with us

Email Newsletter

Join thousands of others with our weekly newsletter

The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.