BIBLIOS

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
Absolute steady-state thermal conductivity measurements by use of a transient hot-wire system

Participantes na publicação
H.M. Roder (Author)
R.A. Perkins (Author)
A. Laesecke (Author)
C.A.N. de Castro (Author)
Dep. Química e Bioquímica
CQE

Resumo
A transient hot-wire apparatus was used to measure the thermal conductivity of argon with both steady-state and transient methods. The effects of wire diameter, eccentricity of the wire in the cavity, axial conduction, and natural convection were accounted for in the analysis of the steady-state measurements. Based on measurements on argon, the relative uncertainty at the 95 % level of confidence of the new steady-state measurements is 2 % at low densities. Using the same hot wires, the relative uncertainty of the transient measurements is 1 % at the 95 % level of confidence. This is the first report of thermal conductivity measurements made by two different methods in the same apparatus. The steady-state method is shown to complement normal transient measurements at low densities, particularly for fluids\nwhere the thermophysical properties at low densities are not known with high accuracy.


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
Journal of Research of the National Institute of Standards and Technology

Identificadores da Publicação

Editora
National Institute of Standards and Technology (NIST)



Identificadores do Documento
DOI - https://doi.org/10.6028/jres.105.028
URL - http://dx.doi.org/10.6028/jres.105.028

Keywords
argon convection dilute gas hot wire instrument steady state thermal conductivity transient

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