Thermal conductivity: Physical magnitude characterizing
the behavior of materials while the warmth transfer by conduction.
It represents quantity of transfered warmth by surface unit and
by time unit under a temperature gradient. In the units
international system, the thermal conductivity is formulated in Watts by Meter Kelvin (W/m.K).
Mass warmth: Also called mass thermal
capacity, is determined by the energy quantity to bring
by thermal exchange in order to increase of one degree the temperature
of substance mass unit. The unit of the international system is
the joule by kilo kelvin (J/kg.K). The valors determination of substances
thermal capacity is the calorimetry.
Specific heat capacity: Also called thermal
capacity, is a magnitude which quantify the possibility
that a body to absorb or return energy by thermal exchange
while a transformation wherein its temperature changes. In the
units international system, the specific
heat capacity is formulated in Mega Joule by cubic meter and by Kelvin (MJ/m3.K)
Thermal effusivity: It's given by the formula : where λ is its thermal conductivity, ρ its density, and c its mass
thermal capacity. The effusivity unit S.I. is (J/K/m³).(m²/s). The
material effusivity is its capacity
to exchange thermal energy with its environment.
Thermal diffusivity: The thermal
diffusivity is the penetration rate and allevation of a
thermal wave in a milieu. alpha = lambda / Cv. The thermal
diffusivity of material is linked to its thermal conductivity by the relation :
Diffusivity [m²/s] = Conductivity [W/m.K] / (Volume mass [kg/m^3] x
Specific warmth [J/kg.K])
Non-destructive control: The Non-Destructive Control (C.N.D.) consists in several methods
which allow to characterize the integrity condition of industrial
structures, without damage them, either during production,
or during use. It must determine the acceptable size and then,
detect them, without break the piece, and substitute it.
We called also Non-Destructive Tests or Non-Destructive Examination (E.N.D.).
DETECT: Thermoconcept device estimates the Effusivity and Thermal Conductivity.
This system is based on Hot Plan and Hot Wire methods which allow to estimate thermophysical
parameters of thermal Effusivity and thermal
Conductivity.
LECET: It's an Estimation
software of Conductivity and Thermal Effusivity. It's developed by THERMICAR to manage sensors stimulation and thus, to determine thermal properties
of materials.
Calorimetry: Part
of the thermodynamics which measures warmth quantities. We use a calorimeter.
Calorimeter: Device bound to measure warmth exchanges (calorific energy,
from Latin "calor" means warmth). This exchange can be
made between several bodies, and can create condition changes or
chemical reactions. The calorimeter is an insulated thermodynamics system, so, there's no substance and
energy exchanges (work or warmth) with the exterior environment.
Hot Wire: This thermal
characterization method allows to determine thermal conductivity of material with a stimulation system
of filaria kind (resistive wire) and with a temperature sensor (thermocouple).
Hot Plan: This thermal characterization method allows to
determine thermal effusivity of
material with a stimulation system of planaire kind (resistive plan)
and with a temperature sensor (thermocouple).
Flash Method: This thermal characterization method allows to
determine thermal diffusivity of material with a stimulation system of flash kind (luminosity
lamp, laser…) in front face of the sample and a temperature
sensor with or without contact (infrared camera, pyrometer, thermocouple
with separated contact) in back face.
Hot Strip: This thermal
characterization method allows to determine thermal conductivity and thermal effusivity of
material with a stimulation system of strip kind (intermediary
between the plan and the resistive wire) and a temperature sensor (thermocouple).
DSC: The scanning differential calorimetry (DSC)
or differential thermal analysis (ATD) is a thermal analysis
method wherein the difference of necessary warmth quantity to
increase the sample temperature in respect to this of a reference
is measured according to the temperature. It allows
to determine the vitreous transition
temperature(Tg) of polymers, fusion and crystallisation temperatures,
also the reaction enthalpies to know
the reticulation rate of polymers. Permanently, the sample
temperature is compared to a reference temperature. Analysis are
made under scanning of an inert gas (nitrogen or argon for instance)
in order to avoid material reactions with the furnace atmosphere.
Infrared: The infrared radiance (IR) is an electromagnetic
radiance with a wavelength up to this of the visible light
but shorter that this of microwave.
The name means « beyond red » (from Latin infra : « beyond »).
Red is the color of the longest wavelength of the visible light. This
wavelength is between 700 nm and 1 mm.
The infrared are often subdivided in near IR,
medium IR and distant IR.
The infrared are often associated to the warmth
because, at room temperature, objects give out radiations in infrared field. The exact relation is given by the rule of black body
radiance; Moreover, the infrared radiance puts in
vibes the body atoms which absorb them and so, increase its temperature (warmth transfer
by radiance).
JEI : Status of Young Innovative Company for companies realizing Research and Development projects on new products
or current products.
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