Abstract
Transient methods of measuring thermal conductivities of poor conductors are very rapid and can be applied to small systems. By recording the temperature of an electrically heated wire, the conductivity of the environment can be determined in a fraction of a second. Thus with a wire of radius 10
-2
cm the measuring time is less than 10
-1
s and the effective overall radius of the system is about 10
-1
cm; furthermore, the effective length can be reduced to about 1·0 cm by making the wire a thermo-junction. Apparatus operating on this principle consists of a source of radio-frequency current for heating the junction wires and an oscillograph for simultaneous recording of the thermo-e. m. f. Temperature-time curves are used to deduce the thermal conductivity of substances placed in contact with the wires. The method is very flexible and can be applied to small, rapidly changing systems at high temperatures. The conductivities of certain liquids have been measured at room temperature. The values obtained generally lie within 10% of the accepted values.
Reference15 articles.
1. A D.C. Amplifier for Biological Application
2. Carslaw A. S. & Jaeger J. C. 1947 Conduction of heat in solids. London: Oxford University Press.
3. Proc. Roy;Challoner A. R.;Soc. A,1956
4. Chance B. etal 1949 Waveforms (M.I.T. Radiation Laboratory Series no. 19). New York: McGraw Hill.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
1. Use of the Bibliography;Thermophysical Properties Research Literature Retrieval Guide 1900–1980;1982
2. Bibliography;Thermophysical Properties Research Literature Retrieval Guide 1900–1980;1982
3. Measurement of the properties of liquids and gases using a transient hot‐wire technique;Review of Scientific Instruments;1978-10
4. Hot-wire method in a nonstationary variation;Journal of Engineering Physics;1976-11
5. A contribution to the theory of the transient hot-wire method;Physica;1971-04