An ac calorimetric method is applied to the direct measurement of thermal diffusivity of single fibers. Theoretical analysis is presented, taking into account the two‐dimensional ac thermal wave for cylindrical systems and the effect of time delay at the temperature detecting system. Experimental tests are performed using nickel and stainless steel wires about 20 μm in diameter. The thermal conductivity of fibers about 10 μm in diameter of the advanced materials, polyacrylonitrile‐based carbon, TORAYCA, and aramide, Kevlar, is determined. The relationship between the thermal conductivity and electric conductivity and the crystalline size of these fibers is discussed. For composite materials made of carbon fibers, the observed thermal conductivity agrees with the thermal conductivity estimated using the values determined by the present method.

Topics
Thermal conductivity, Electrical conductivity, Composite materials, Calorimetry, Polymers, Chemical compounds
1.
R. Berman, Thermal Conduction in Solids (Clarendon, Oxford, 1976).
2.
J.
Heremans
 and
C. P.
Beetz
, Jr.,
Phys. Rev. B
32
,
32
(
1981
).
Google Scholar
 
3.
L.
Piraux
,
P.
Coopmans
, and
J.-P.
Issi
,
Measurement
5
,
2
(
1987
).
Google Scholar
Crossref
Search ADS
 
4.
J. H.
Barkyoumb
 and
D. J.
Land
,
J. Appl. Phys.
78
,
905
(
1995
).
Google Scholar
Crossref
Search ADS
 
5.
I.
Hatta
,
Y.
Sasuga
,
R.
Kato
, and
A.
Maesono
,
Rev. Sci. Instrum.
56
,
1643
(
1985
).
Google Scholar
Crossref
Search ADS
 
6.
I.
Hatta
,
H.
Yao
,
R.
Kato
, and
A.
Maesono
,
Jpn. J. Appl. Phys.
29
,
2851
(
1990
).
Google Scholar
Crossref
Search ADS
 
7.
I.
Hatta
,
R.
Kato
, and
A.
Maesono
,
Jpn. J. Appl. Phys.
26
,
475
(
1987
).
Google Scholar
Crossref
Search ADS
 
8.
Y.
Gu
 and
I.
Hatta
,
Jpn. J. Appl. Phys.
30
,
1137
(
1991
).
Google Scholar
 
9.
T.
Yamane
,
S.
Katayama
, and
M.
Todoki
,
Rev. Sci. Instrum.
66
,
5305
(
1995
).
Google Scholar
Crossref
Search ADS
 
10.
H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. (Oxford University Press, New York, 1959).
11.
Y.
Gu
,
X.
Tang
,
Y.
Xu
, and
I.
Hatta
,
Jpn. J. Appl. Phys.
32
,
L1365
(
1993
).
Google Scholar
Crossref
Search ADS
 
12.
I.
Hatta
,
R.
Kato
, and
A.
Maesono
,
Jpn. J. Appl. Phys.
25
,
L493
(
1986
).
Google Scholar
Crossref
Search ADS
 
13.
Y. S. Touloukian, R. W. Powell, C. Y. Ho, and M. C. Nicolaou, Thermophysical Properties of Matter, Thermal Diffusivity, TPRC Data Services Vol. 10 (IFI/Plenum, New York, 1973).
14.
A.
Sumida
,
K.
Ono
, and
Y.
Kawazu
,
Int. SAMPE Symp. Exhib.
34
,
2579
(
1989
).
Google Scholar
 
15.
D. T.
Grubb
,
K.
Prasad
, and
W.
Adams
,
Polymer
32
,
1167
(
1991
).
Google Scholar
Crossref
Search ADS
 
16.
Y.
Gu
 and
I.
Hatta
,
Jpn. J. Appl. Phys.
30
,
1295
(
1991
).
Google Scholar
 
17.
B. T. Kelly, Physics of Graphite (Applied Science, London, 1981).
18.
R. E. Taylor and K. D. Maglic, Compendium of Thermophysical Property Measurement Methods, Vol. 1, “Survey of Measurement Techniques,“ edited by K. D. Maglic, A. Cezairliyan, and V. E. Peletsky (Plenum, New York, 1984).
19.
R. E. Taylor and K. D. Maglic, Compendium of Thermophysical Property Measurement Methods, Vol. 2, “Recommended Measurement Techniques and Practices,“ edited by K. D. Maglic, A. Cezairliyan, and V. E. Peletsky (Plenum, New York, 1992).
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