Impulse Method for Determining Thermal Diffusivity of Solids

Terpiłowski, Janusz

doi:10.1007/978-94-007-2739-7_391

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…In currently most frequently used pulse methods for thermal diffusivity, the interval is usually reported to be ∆T =2-15 K [1,[4][5][6], and in the Ångström method [1][2][3] the interval ∆T < 5 K. It happens quite often that the publications do not give the value of ∆T or its value is misinterpreted. This relates mostly to the classical pulse method [4], when it is assumed that ∆T = Θ ∞ is a temperature rise on the rear surface of the investigated specimen.…”

Section: Introductionmentioning

confidence: 99%

Adaptation of the modified pulse method for determination of thermal diffusivity of solids in the vicinity of the second-order phase transition points

Terpiłowski¹,

Szczepaniak²,

Woroniak³

et al. 2013

Archives of Thermodynamics

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The paper presents the adaptation of the modified pulse method for investigating temperature characteristics of thermal diffusivity in the vicinity of the second-order phase transition points. The principle of the adaptation consists in the modified in relation to the original method, development of the characteristics of temperature changes between boundary surfaces of a flat-parallel specimen after the laser shot onto its front surface. The application of this adaptation was illustrated with investigation into thermal diffusivity of nickel (99.9% wt) in the temperature range of 20-380◦C. In all cases the measurement error was less than 3%, and the averaging interval for the measured values of thermal diffusivity was not greater than 1.2 K.

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Section: Introductionmentioning

confidence: 99%

Adaptation of the modified pulse method for determination of thermal diffusivity of solids in the vicinity of the second-order phase transition points

Terpiłowski¹,

Szczepaniak²,

Woroniak³

et al. 2013

Archives of Thermodynamics

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“…The MPM for the measurement of thermal diffusivity was previously described in detail in [ 41 , 42 ]. The determination of thermal diffusivity by the MPM means is based on the theoretical determination of the temperature distribution inside an opaque and adiabatic sample, and the difference in temperature between two lateral surfaces after the laser pulse is fired on the front surface.…”

Section: Short Description Of Methods and Test Benchmentioning

confidence: 99%

Investigation of Phase Transformation of Fe65Ni35 Alloy by the Modified Pulse Method

et al. 2020

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This paper presents the possibility of using a modified-pulse method (MPM) determining the temperature characteristics of thermal diffusivity in order to identify phase transformations in metals. The experiment and attempt of phase identification were conducted for the Fe65Ni35 alloy in the 20–500 °C temperature range during both sample heating and cooling. The estimated error of discrete thermal diffusivity measurements was less than 3%. The method allows us to narrow down the averaging of the interval of this value, as a function of temperature, in the range below 1 K. Recently published analysis of the phase diagrams of Fe–Ni alloys, and the results of the authors’ own research into the Fe65Ni35 alloy, showed very good correlation between changes occurring when heating the alloy and the equilibrium diagram provided by Cacciamani G., Dinsdale A., Palumbo M., and Pasturel A. (Intermetallics 18, 2010, 1148–1162) showing the position of phases with a crystal-lattice structure based on the face-centered cubic (FCC) cell.

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“…[6]. The modified pulse method [3,4] used in these investigations, and its essential elements are shown in Fig. 4.…”

Section: The Methods For Determining the Characteristic Time And Thermmentioning

confidence: 99%

“…The errors of the thermal diffusivity a measurement and the characteristic time τ by means of the above method have been estimated as △a/a < 0.04 and △τ /τ < 0.02 respectively (the values of errors were estimated during the modified flash method developing) [3][4][5].…”

Section: The Methods For Determining the Characteristic Time And Thermmentioning

confidence: 99%

“…In accordance with the principles of the theory of similar phenomena [1,2] as a basis for determining the equivalent thickness of the two-component composite in a simulation model with the properties of homogeneous material, equal values of Fourier numbers for the total thickness of matrix material and layers of the composite treated as reinforcement in the wall, were assumed. Further course of action, related to the construction and solution model transient heat transfer in plane-parallel isotropic wall, with the replacement thickness l E,S , is identical with the model used to determine the thermal diffusivity by a modified pulse method [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of transient heat transfer in composite walls using carbon/epoxy composites as an example

Terpiłowski

Gawron

Woroniak

2015

Archives of Thermodynamics

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The paper presents the application of similarity theory to investigations of transient heat transfer in materials with complex structure. It describes the theoretical-experimental method for identification and design of the structure of two-component composite walls based on the research of the thermal diffusivity for the composite and its matrix separately. The thermal diffusivity was measured by means of the modified flash method. The method was tested on two samples of double-layer ‘epoxy resin – polyamide’. All the investigated samples had the same diameter of 12 mm and thickness ranging from 1.39–2.60 mm and their equivalent value of thermal diffusivity ranging from (1.21–1.98)×10−7 m2/s. Testing the method and research on carbon/epoxy composites was carried out at temperatures close to room temperature.

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Impulse Method for Determining Thermal Diffusivity of Solids

Cited by 4 publications

References 3 publications

Adaptation of the modified pulse method for determination of thermal diffusivity of solids in the vicinity of the second-order phase transition points

Adaptation of the modified pulse method for determination of thermal diffusivity of solids in the vicinity of the second-order phase transition points

Investigation of Phase Transformation of Fe65Ni35 Alloy by the Modified Pulse Method

Investigation of transient heat transfer in composite walls using carbon/epoxy composites as an example

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