A method of determining the thermal conductivity of powdered and fibrous insulation as a function of filler gas pressure |
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Authors: | G N Dul'nev E S Platunov B L Muratova Z V Sigalova |
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Affiliation: | (1) Institute of Precision Mechanics and Optics, Leningrad |
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Abstract: | An examination is made of the theoretical basis and implementation of a nonstationary method of rapid measurement of the thermal conductivity of powdered and fibrous insulation under conditions of monotonic change of filler gas pressure.Notation t
temperature
-
,a
thermal conductivity and diffusivity of test material
- k , ka
relative temperature coefficients of anda
-
thickness of test layer
- x
variable layer coordinate reckoned from shell
-
= (x),
c
excess temperature of material at section x and of core over shell
- bc, bv
rate of cooling of core and of variation of volume-mean temperature of layer
- cc, c
total heat capacity of core and material
- fs, Fc
area of working surfaces of shell and core
- d
diameter of particles of bulk material
- p
material porosity
-
volume density of material |
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Keywords: | |
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