13 Contributions. Literature is a beautiful and complex artistic expression. In ancient times, people would use symbols and pictures to portray a moment in time. Writing, however, gave us a wayâ¦ to convey not only documented history, but the feelings that went along with those moments.
Heat flux and radiative flux are specific cases of energy flux that involve the rate of transfer of heat and radiation (photons) respectively. Energy flux is a function of time as well as area, and has units of J/m 2 /s or W/m 2. It is sometimes also referred to as flux density. In more technical terms, flux density is defined as the energy travelling over an area perpendicular to the flow of energy divided by time and by area. Four types of energy fluxes for ideal (flat and smooth) surfaces have been identified so far.
We will define the electric flux for an electric field that is perpendicular to an area as. = E A. If the electric field E is not perpendicular to the area, we will have to modify this to account for that. Think about the air flux of air passing through a window at an angle. The effective area is A cos or the component of the velocity perpendicular to the window is v cos.