So the flash-pulse analysis does not only detect the presence of defects but also determine their depth under the surface if a thermal diffusivity of the sample is known.
12.
The thermal diffusivity of the base material plays a large role & mdash; if the diffusivity is high, the material cooling rate is high and the HAZ is relatively small.
13.
The "'laser flash analysis "'or "'laser flash method "'is used to measure thermal diffusivity of a multiplicity of different materials.
14.
In the energy balance this is replaced by thermal diffusivity \ alpha = { k / \ rho C _ P }, and by mass diffusivity D _ { AB } in the mass balance.
15.
A state-of-the-art laser flash apparatus ( "'LFA "') to measure thermal diffusivity over a broad temperature range, is shown on the right hand side.
16.
Needles 1 and 2 work in conjunction to measure salts in the regolith, heat the soil to measure thermal properties ( thermal conductivity, specific heat and thermal diffusivity ) of the regolith, and measure soil temperature.
17.
As a result the thermal diffusivity in most solids can be estimated as the speed of sound in the material ( typically a few km / s ) times the phonon mean free path ( typically several angstroms ).
18.
11 . " INVESTIGATION OF THERMAL DIFFUSIVITY-MICROHARDNESS CORRELATION EXTENDED TO SURFACE-NITRURED STEEL USING BOUBAKER POLYNOMIALS EXPANSION ", Modern Physics Letters B, Volume : 22, Issue : 29 ( 2008 ) pp . 2893 2907
19.
Where \ alpha is the thermal diffusivity and D is the mass diffusivity, \ lambda is the thermal conductivity, D _ { im } the mixture-averaged diffusion coefficient, and c _ p the specific heat capacity at constant pressure.
20.
Here, h is the thickness of the oceanic mantle lithosphere, \ kappa is the thermal diffusivity ( approximately 10 " 6 m 2 / s ) for silicate rocks, and t is the age of the given part of the lithosphere.
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