A new method for thermal diffusivity and thermal conductivity evaluation from transient hot-strip measurements

Song, Yu; Groß, Ulrich; Hahne, Ε.

doi:10.1016/0378-3812(93)87119-l

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…The transient plane source (TPS) [1][2][3][4][5][6][7][8], the transient hot-strip (THS) [9][10][11][12][13], and the pulse transient hot-strip (PTHS) techniques [14][15][16][17] are used for measuring the thermal properties of materials, covering a wide range of materials and sample geometries.…”

Section: Introductionmentioning

confidence: 99%

On the Use of the Transient Hot-Strip Method for Measuring the Thermal Conductivity of High-Conducting Thin Bars

et al. 2006

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The thermal conductivity of thin, high-conducting ceramic bars-commonly used in mechanical tensile testing-is measured using a variant of the short transient hot-strip technique. As with similar contact transient methods, the influence from the thermal contact resistance between the sensor and the sample is accurately recorded and filtered out from the analysis-a specific advantage that enables sensitive measurements of the bulk properties of the sample material. The present concept requires sensors that are square in shape with one side having the same width as the bar to be studied. As long as this requirement is fulfilled, the particular size of the thin bar can be selected at will. This paper presents an application where the present technique is applied to study structural changes or degradation in reinforced carbon-carbon (RCC) bars exposed to thermal cycling. Simultaneously, tensile testing and monitoring of mass loss are conducted. The results indicate that the present approach may be utilized as a non-destructive quality control instrument to monitor local structural changes in RCC panels.

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Section: Introductionmentioning

confidence: 99%

On the Use of the Transient Hot-Strip Method for Measuring the Thermal Conductivity of High-Conducting Thin Bars

et al. 2006

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“…This method is dedicated to high conductivity materials (>6 W m −1 • C −1 ) for which the semi-infinite medium hypothesis is true only for low values of the ratio of the measuring time to the sample dimensions. All the methods based on the hypothesis of a semi-infinite medium for the sample are thus limited to this type of material (hot plate [1], hot wire [2,3], hot strip [4][5][6][7] or hot disc [8]) since they need to work with very large dimension samples or have too short an estimation time to reach an acceptable precision. Nevertheless, some devices allowing the simultaneous estimation of thermal effusivity and conductivity of thermally finite samples have been achieved; they are all based on the processing of transient measurement of the temperature of a heating probe set between two samples of the material to be characterized.…”

Section: Introductionmentioning

confidence: 99%

Transient hot plate method with two temperature measurements for thermal characterization of metals

Jannot

Acem

Kanmogne

2005

Meas. Sci. Technol.

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This paper presents a study of the transient hot plate method with simultaneous measurements of front (heated) and rear face temperatures. In contrast to the classical device, a single sample of the material to be thermally characterized is set in contact with a planar heating element and inserted between two pieces of insulating material. The purpose was to simultaneously estimate thermal effusivity and conductivity of metals in a limited time t 2 (<90 s) using a low-cost device. Heat transfer has been modelled with a quadrupole formalism to simulate the front and rear face temperatures T 0 (t) and T 2 (t). Simulation is used to fix the minimal thickness of the sample so that the front face temperature remains independent of thermal conductivity during a time t 1 > 30 s. The thermal effusivity is estimated between 0 and t 1 by minimization of the quadratic errors between the experimental curve and the simulated curve T 0 (t). The thermal conductivity is estimated between 0 and t 2 by minimization of the quadratic errors between the experimental curve and the simulated curve T 2 (t). To validate the model and the estimation process, experimental tests were realized on four samples of metals with conductivities varying from 6 to 140 W m −1 • C −1 and having typical area 44.5 × 44.5 mm 2 and thickness varying from 16.7 to 80 mm.

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“…• The hot strip (HS) that is a heating strip made of an electrical resistance disposed on a thin rectangular support; it has been studied by Gustafsson et al [1], Lourenco et al [2] and Song et al [3]. The electrical resistance is used both to produce heat and to measure the mean temperature of the hot strip.…”

Section: Introductionmentioning

confidence: 99%

Simplified estimation method for the determination of the thermal effusivity and thermal conductivity using a low cost hot strip

Jannot

Meukam

2004

Meas. Sci. Technol.

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This paper presents the study of a hot strip made of thin rectangular electrical resistance with a thermocouple placed on its centre. The purpose was to simultaneously estimate thermal effusivity and conductivity in a limited time (t 2 < 180 s) using a low cost probe. Heat transfer has been modelled with the quadrupole formalism to simulate the evolution of the temperature at the centre of a hot strip set between two samples of material to be characterized when a heat flux step is applied. Simulation is used to fix the optimal dimensions of a hot strip that behaves as a hot plate (1D transfer) during a minimal time t 1 (>20 s) and that has higher sensitivity to the thermal conductivity between t 1 and t 2 (2D transfer). The thermal effusivity is estimated between 0 and t 1 by minimization of the quadratic errors between the experimental curve and the curve calculated by the classical hot plate model. The thermal conductivity is estimated between t 1 and t 2 but using the complete 2D model. To validate the model and the estimation process, experimental tests were realized on three materials with low diffusivities (a < 2 × 10 −7 m 2 s −1) and having typical area of 6 cm × 4 cm and typical thickness of 1.5 cm.

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A new method for thermal diffusivity and thermal conductivity evaluation from transient hot-strip measurements

Cited by 10 publications

References 9 publications

On the Use of the Transient Hot-Strip Method for Measuring the Thermal Conductivity of High-Conducting Thin Bars

On the Use of the Transient Hot-Strip Method for Measuring the Thermal Conductivity of High-Conducting Thin Bars

Transient hot plate method with two temperature measurements for thermal characterization of metals

Simplified estimation method for the determination of the thermal effusivity and thermal conductivity using a low cost hot strip

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