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Global map of the flux of heat, in mW/m 2, from Earth's interior to the surface. [1] The largest values of heat flux coincide with mid-ocean ridges, and the smallest values of heat flux occur in stable continental interiors. Earth's internal heat budget is fundamental to the thermal history of the Earth.
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/m 2). It has both a direction and a magnitude, and so it is a vector quantity.
Consider a steady-state distribution of temperature in a body for given temperature values on the body surface. Then the resulting heat flux through the boundary (that is, the heat flux that would be required to maintain the given surface temperature) is determined uniquely. The mapping of the surface temperature to the surface heat flux is a ...
On-site heat flux measurements are often focused on testing the thermal transport properties of for example pipes, tanks, ovens and boilers, by calculating the heat flux q or the apparent thermal conductivity. The real-time energy gain or loss is measured under pseudo steady state-conditions with minimal disturbance by a heat flux transducer ...
In meteorology, the term 'sensible heat flux' means the conductive heat flux from the Earth's surface to the atmosphere. [6] It is an important component of Earth's surface energy budget. Sensible heat flux is commonly measured with the eddy covariance method.
Energy flux is the rate of transfer of energy through a surface. The quantity is defined in two different ways, depending on the context: Total rate of energy transfer (not per unit area); [1] SI units: W = J⋅s −1. Specific rate of energy transfer (total normalized per unit area); [2] SI units: W⋅m −2 = J⋅m −2 ⋅s −1:
Triton's surface is quite flat, its topography never varying by more than a kilometer; [17] calculating from the relaxation of Triton's surface features, Triton's surface heat flux is on the order of 10-100 mW/m 2, [18] [12] comparable to Europa's estimated surface heat flux of ~50 mW/m 2. [19]
Eventually, the additional heat sources within the Earth were discovered, allowing for a much older age. This section is about a similar paradox in current geology, called the thermal catastrophe . The thermal catastrophe of the Earth can be demonstrated by solving the above equations for the evolution of the mantle with Q cmb = 0 ...