Thermal conductivity of air at different temperatures
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Thermal conductivity of air at different temperatures
Junjie Chen
Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China
Contributor: Junjie Chen, ORCID: 0000-0002-5022-6863, E-mail address: koncjj@gmail.com
The thermal conductivity of a material is a measure of its ability to a particular material conduct heat. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. For instance, metals typically have high thermal conductivity and are very efficient at conducting heat, while the opposite is true for insulating materials. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications, and materials of low thermal conductivity are used as thermal insulation. The reciprocal of thermal conductivity is called thermal resistivity. There are several ways to measure thermal conductivity; each is suitable for a limited range of materials. Broadly speaking, there are two categories of measurement techniques: steady-state and transient. Steady-state techniques infer the thermal conductivity from measurements on the state of a material once a steady-state temperature profile has been reached, whereas transient techniques operate on the instantaneous state of a system during the approach to steady state. Lacking an explicit time component, steady-state techniques do not require complicated signal analysis. The disadvantage is that a well-engineered experimental setup is usually needed, and the time required to reach steady state precludes rapid measurement. In comparison with solid materials, the thermal properties of fluids are more difficult to study experimentally. This is because in addition to thermal conduction, convective and radiative energy transport are usually present unless measures are taken to limit these processes. The formation of an insulating boundary layer can also result in an apparent reduction in the thermal conductivity.
Thermal conductivity (watts per meter-kelvin), Temperature (degrees kelvin)
0.00922
100
0.01375
150
0.0181
200
0.02226
250
0.02614
300
0.0297
350
0.03305
400
0.03633
450
0.03951
500
0.0456
600
0.0513
700
0.0569
800
0.0625
900
0.0672
1000
0.0717
1100
0.0759
1200
0.0797
1300
0.0835
1400
0.087
1500
创建时间：
2024-07-15
