Приклади вживання The thermal conductivity Англійська мовою та їх переклад на Українською
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Under these conditions, the thermal conductivity varies from 0,140 to 0,158 Kcal/ m h. deg.
Superfluid phase at temperature below 2.17 K. In this state, the thermal conductivity is extremely high.
There is no doubt that the thermal conductivity of ceramic PCB is the best among many materials;
The thermal conductivity of the wood is one of the reasons why it is cool in summer and warm in winter.
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In particular, it was planned to study the thermal conductivity of the lunar soil and its other thermal properties.
The thermal conductivity of the concrete is 50 times less than that of steel, but it is much higher than that of brick.
Quite a popular ceramic blocks,having due to the porosity the lower the thermal conductivity compared to the brick.
The thermal conductivity of the foam is very small, so with their direct functions, he manages more than a full;
Two classes of methods exist to measure the thermal conductivity of a sample: steady-state and non-steady-state(or transient) methods.
Therefore, it's crucial to determine the thresholds for each,which can be done by assessing the thermal conductivity of a PCB.
Equally important is the fact that the thermal conductivity of light alloys is higher than that of steel, several times.
This method is based upon the measurement of the temperature rise at the rear face of the thin-disc specimen produced by a short energy pulse on the front face. With a reference sample specific heat can be achieved andwith known density the thermal conductivity results as follows.
Among them, the thermal conductivity of ADC12 is 96.7w/m °C, and the aluminum material such as AL6060 is 198~250w/m °C.
These temperatures depend on the initial temperature and the thermal conductivity and heat transfer characteristics of the product.
The thermal conductivity of the blocks of porous concrete is better, although the thermal capacity of the brick still deserves more attention.
This kind of heat transport is very effective,so the thermal conductivity of He-II is very much better than the best materials.
The thermal conductivity depends on the crystalline state(a single crystal or polycrystal),the presence or absence of defects, and other factors.
During the experiments, scientists realized that the thermal conductivity at the molecular level does not change as much as in the macrocosm.
The thermal conductivity of each material is different, and the thermal conductivity is arranged from high to low, which are silver, copper, aluminum and steel.
This is about three times more thermal conductivity than the thermal conductivity of sheet indium, a material used in some areas to provide high-efficiency cooling.
The thermal conductivity of scale and corrosive pollution approximately is 40 times lower than the thermal conductivity of the heating spiral according polluted equipment will be required to maintain the temperature of much larger power consumption than pure.
Because of the high level of humidity,the heat comes from the low influence of the air. The thermal conductivity of humid air is much higher than of the dry air.
Being a poor conductor of heat,plastic pipes do not require such insulation like metal(for example, the thermal conductivity of polyethylene tubes in 175 times less than steel and 1300 times lower than copper).
Given that the thermal conductivity of swollen vermiculite is 0,04- 0,062 W/ mK, and the brickwork- 0,8 W/ mK, and concrete- 1,45 W/ mK, it turns out that a layer of vermiculite filling in 20cm of thermal protection equivalent to a brick wall thickness of 1,5 m or 2m-thick concrete wall.
LED lighting Copper Base PCB Boards Copper substratesare the most expensive of metal substrates The thermal conductivity of copper substrates is many times better than that of aluminum substrates and iron substrates It is suitable for heat dissipation and building decoration industry of high frequency circuit high….
Tuning thus the thermal conductivity, the material can be effectively applied to automatically dissipate heat in the hot summer, because it will have high conductivity, but to prevent its loss in the cold winter, due to low thermal conductivity at lower temperatures.
Non-steady-state methods to measure the thermal conductivity do not require the signal to obtain a constant value. Instead, the signal is studied as a function of time. The advantage of these methods is that they can in general be performed more quickly, since there is no need to wait for a steady-state situation.
There are discussed the thermal conductivity of the conductors, the physical sense of proportionality between the thermal conductivity and specific heat capacity at constant volume, the relationship between the transmission coefficient and the mean-free-path, the calculation of the number of phonon modes and density of phonon states, the Debye model of heat conductivity and scattering of phonons, the temperature dependence of the lattice thermal conductivity, the difference between the lattice thermal conductivity and electron conduction, and quantization of thermal conductivity. .