The mathematical expression of the thermal conditions at the boundaries is called boundary conditions
Example: Expertise is necessary to apply the appropriate BOUNDARY CONDITIONS and forces to the model to extract the relevant data.
es: condiciones de frontera
Emissivity
noun
Emissivity is defined as the relationship between the energy radiated from the surface of a material and that radiated by a perfect emitter, known as a black body, at the same temperature and wavelength and under the same viewing conditions.
Energy balance
noun
all energies into the system are equal to all energies leaving the system plus the change in storage of energies within the system.
Example: The purpose of the present study is to study the thermal conditions and to establish an ENERGY BALANCE for a transpiration cooled anode as well as the effect of blowing on the arc voltage.
es: Balance de energia
Heat conduction equation
noun
Heat conduction (or thermal conduction) is the movement of heat from one object to another one that has different temperature when they are touching each other.
Example: Because foods act as poor HEAT CONDUCTION medium as illustrated in the last part of the experiment, the smaller in size leads to faster freezing time
es: Ecuación de conducción de calor
Heat flux
noun
Heat flux is the rate of thermal energy that passes through a surface. Depending on the exact definition of heat flux, its unit can be expressed as W / m 2 or W.
Example: The gas flow through a plasma generator will modify these conditions; however, the anode is still the part receiving the largest HEAT FLUX.
es: flujo de calor
heat generation
noun
In heat transfer analysis, the conversion of electrical, chemical, or nuclear energy into heat (or thermal) energy is characterized as heat generation
Example: The density of HEAT GENERATION is very large and this demands a lot from your heat transfer system (reactor cooling system).
es: generación de calor
Insulation
noun
creating a barrier between the hot and the cold object that reduces heat transfer by either reflecting thermal radiation or decreasing thermal conduction and convection from one object to the other
Example: The high temperatures of 650°C - 700°C may still be enough to damage INSULATION and anneal the conductor though.
es: aislamiento
Internal energy
noun
The first law of thermodynamics defines internal energy (E) as equal to the difference of heat transfer (Q) in a system and the work (W) done by the system.
Example: The change in INTERNAL ENERGY (U) of the system is equal to the heat added (Q).
es: energía interna
stationary
adjetive
It is said that the conduction of heat in aThe medium is stationary (or stable) when the temperature does not change with time and is not stationary or transient when it does has this variation
Example: Newton first arrived at the inverse square law of attraction by considering the elliptical motion of a point planet around a STATIONARY point sun.
es: Estacionario
Thermal conductivity
noun
The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by κ,λ
Example: HERMAL CONDUCTIVITY is directly traceable to the material's porous, air-cell construction which effectively traps air or a gas in the maze of minute bubbles which forms its composition.
es: conductividad termica
Thermal diffusivity
noun
is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. High diffusivity means heat transfers rapidly.
Example: Initial spore load: The severity of the process depends on the initial spore load; good factory hygiene keeps this low. 8.Thermophysical properties : The THERMAL DIFFUSIVITY is the controlling factor.
es: Difusividad térmica
Thermal symmetry
noun
he central plane can be conceived as an isolated surface and the thermal condition in this plane of symmetry can be expressed as one that resembles the insulating boundary or zero heat flux condition
Example: For example, the two surfaces of a large hot plate, of thickness L, suspended vertically in the air, will be subject to the same thermal conditions and, therefore, the temperature distribution in one of its halves will be equal to that of of the other half. That is, the heat transfer in this plate will have THERMAL SYMMETRY with respect to the central plane at x = L / 2
es: simetría térmica
three-dimensional
adjective
In the most general case, heat transfer through a medium is three-dimensional. That is, the temperature varies along the three primary directions within the medium during the heat transfer process.
Example: Mohr's Circle for THREE-DIMENSIONAL stresses can be used as a graphical technique the principle stresses.
es: tridimensional
transient
adjective
transit implies variation with time or dependence with respect to time. Therefore, temperature or heat flux remains unchanged over time during stationary heat transfer through a medium, at any location, although the two quantities may vary from location to location.
Example: The essentially TRANSIENT regime left behind little but resentment and destruction.
es: transitorio
two-dimensional
adjective
In some cases the temperature in a medium varies mainly in two primary directions and the variation in temperature in the third direction (and therefore the heat transfer in that direction) is negligible. In that case, a heat transfer problem is said to be two-dimensional
Example: The receive interrupt has been altered to accommodate the smaller data array being used, and is done in a more direct manner in a TWO-DIMENSIONAL buffer array.
