Vector representing the energy passing through a given area per unit time
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Heat flux
Heat flux through a surface.
Common symbols
SI unit
W/m2
Other units
Btu/(h⋅ft2)
In SI base units
kg⋅s−3
Dimension
In physics and engineering, heat flux or thermal flux, sometimes also referred to as heat flux density[1], heat-flow density or heat-flow rate intensity, is a flow of energy per unit area per unit time. Its SI units are watts per square metre (W/m2). It has both a direction and a magnitude, and so it is a vector quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small.
Heat flux is often denoted , the subscript q specifying heat flux, as opposed to mass or momentum flux. Fourier's law is an important application of these concepts.
^The word "flux" is used in most physical disciplines to refer to the flow of a quantity (mass, heat, momentum, etc.) across a surface per unit time per unit area, with the primary exception being in electromagnetism, where it refers to the integral of a vector quantity through a surface. Refer to the Flux article for more detail.
physics and engineering, heatflux or thermal flux, sometimes also referred to as heatflux density, heat-flow density or heat-flow rate intensity, is...
the study of heat transfer, critical heatflux (CHF) is the heatflux at which boiling ceases to be an effective form of transferring heat from a solid...
A heatflux sensor is a transducer that generates an electrical signal proportional to the total heat rate applied to the surface of the sensor. The measured...
Analytical Theory of Heat), defines fluxion as a central quantity and proceeds to derive the now well-known expressions of flux in terms of temperature...
than boiling water, and is more hazardous. In meteorology, latent heatflux is the flux of energy from the Earth's surface to the atmosphere that is associated...
thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heatflux and the thermodynamic...
sensible heat directly affects the temperature of the atmosphere. In meteorology, the term 'sensible heatflux' means the conductive heatflux from the...
film becomes more significant and the heatflux increases with increasing excess temperature. The minimum heatflux for a large horizontal plate can be...
denoted with suffix "Ω". Luminous fluxHeatflux Power (physics) Radiosity (heat transfer) "Thermal insulation — Heat transfer by radiation — Physical...
the heat shield material and provides protection against all forms of heatflux. The overall process of reducing the heatflux experienced by the heat shield's...
the flow of heat. Heatflux is a quantitative, vectorial representation of heat-flow through a surface. In engineering contexts, the term heat is taken as...
precise measurements of heat capacity. There are two main types of DSC: Heat-flux DSC which measures the difference in heatflux between the sample and...
increasingly high heatflux microcomputer CPUs spurred a threefold increase in the number of U.S. heat pipe patent applications. As heat pipes evolved from...
yields the energy transfer per unit time per unit area (also known as heatflux): q y ± = − 1 4 v ¯ n ⋅ ( ε 0 ± 2 3 m c v l d T d y ) {\displaystyle q_{y}^{\pm...
sometimes called energy flux density, to distinguish it from the first definition. Radiative flux, heatflux, and sound energy flux are specific cases of...
applied heatflux exceeds the certain limit, heat transfer capability of the flow decreases or significantly drops. Normally, the critical heatflux corresponds...
exchange fluxes of heat, moisture and momentum. Heat The important heat terms at the surface are the sensible heatflux, the latent heatflux, the incoming...
boiling where small bubbles of vapour form at discrete points, and critical heatflux boiling where the boiling surface is heated above a certain critical temperature...
be written with the dot notation) since heat is not a function of state. Heatflux is defined as rate of heat transfer per unit cross-sectional area (watts...
temperature difference across the thermal resistance layer and also to the heatflux through the thermal resistance layer. Adding more thermocouple pairs in...
describes the spectrum of blackbody radiation, and relates the radiative heatflux from a body to its temperature. Wien's displacement law determines the...
processing heatfluxes and perform useful work at small scales. Potential applications include e.g. electric cooling devices. In such mesoscopic heat engines...
conductivity improvements, but found significant increase of the critical heatflux of the coolants. Some significant improvements are achievable; e.g. silver...
temperature) On the skin of the forehead over the temporal artery Using heatflux sensors Temperature control (thermoregulation) is a homeostatic mechanism...
saturated fluid temperature by a certain amount but where the heatflux is below the critical heatflux. For water, as shown in the graph below, nucleate boiling...
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