The reason why the extraction thermocouple with heat shelter can improve the accuracy of temperature measurement is that
A. The extraction thermocouple with heat shelter greatly reduces the radiative heat transfer on the surface of the thermocouple
B. The extraction thermocouple with heat shelter greatly increases the radiation heat transfer on the surface of the thermocouple
C. The extraction thermocouple with heat shelter increases the convective heat transfer coefficient of the thermocouple surface
D. The extraction thermocouple with heat shelter greatly reduces the convection heat transfer on the surface of the thermocouple
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Which of the following descriptions about the characteristics of gas radiation is wrong
A. Radiation and absorption of different types of gases may be quite different
B. Radiation and absorption of gas may have obvious selectivity for wavelength
C. The conclusion of Kirchhoff's law is also applicable to most gas radiation
D. Radiation and absorption of gas takes place in the entire volume
Two infinite parallel plates with emissivity of 0.3 and 0.5 respectively, the temperature is maintained at 800℃ and 370℃, a heat shelter with an emissivity ε of 0.05 on both sides of the surface is added in the middle. When the radiation reaches equilibrium, the temperature of the heat shield is
A. 551 ℃
B. 651 ℃
C. 751 ℃
D. 851 ℃
Which of the following factors affect the angle coefficient between two surfaces
A. Temperature of both surfaces
B. Emissivity of both surfaces
C. The geometry and relative position of the two surfaces
D. All the above factors have an impact
Knowing the geometric conditions of a curved edge hexahedron, the total number of view factor and the number of independent view factor between each surface are
A. 25, 10
B. 25, 15
C. 36, 10
D. 36, 15
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