Determination of temperature dependent thermophysical properties using an inverse method and an infrared line camera

Lippmann, Stephanie; Grasemann, Aaron; Zhu, Mingfang; Rettenmayr, Markus

doi:10.1016/j.ijheatmasstransfer.2015.12.020

Cited by 17 publications

(8 citation statements)

References 25 publications

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“…Figure 4 presents the temperature dependent thermal conductivity of Cu-30Zn. As expected [18,20], the values determined by the temperature gradient evaluation method increase with temperature. The thermal conductivity from our previous work [20] was calculated using experimental thermal diffusivity and equation ( 1); it agrees well with the present data.…”

Section: Measurements In Ni Cu-30zn and Tial-tnmsupporting

confidence: 77%

“…They were heated at their top ends using middle frequency induction heating (f = 16 kHz). Extending our previously introduced set-up [20], the samples were cooled at their lower ends in the streaming mineral oil-based cooling agent Fragoltherm ® Q-7 (Fragol AG, Germany). One-dimensional heat flux in axial direction through the sample was ensured by sheathing the sample inside the induction coil with aluminum silicate wool and underneath the coil with silica aerogel, see figure 1.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…It is known that microstructural features such as grain size and dislocation density may affect thermal properties, but were not further discussed in [16,[26][27][28][29]. Thus, for applications demanding highly accurate [20]) and k (recommended thermal conductivity with accuracy of ±10% from [18]). knowledge of thermal conductivity, reference data should be chosen with care or should be obtained experimentally for a given material state.…”

Section: Measurements In Ni Cu-30zn and Tial-tnmmentioning

confidence: 99%

“…In our previous work [20] we introduced a temperature gradient evaluation method and an experimental set-up for determining temperature dependent thermal diffusivities without the requirement of thermal equilibrium before the measurement. With this method, thermal diffusivity is measured as function of temperature within temperature intervals of hundreds of K in less than 1 h. The method analyzes temperature profiles in the transient state during heating and determines the thermal diffusivity using an inverse numerical method.…”

Section: Introductionmentioning

confidence: 99%

“…In the present work, we extend our previously introduced experimental set-up [20] to directly determine thermal conductivity as function of temperature by evaluating steady-state temperature distributions. With this extension, thermal conductivity and thermal diffusivity are measured independently using the same sample and experimental set-up.…”

Section: Introductionmentioning

confidence: 99%

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A temperature gradient evaluation method for determining temperature dependent thermal conductivities

Wilhelmy

Zimare

Lippmann

et al. 2021

Meas. Sci. Technol.

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Details of an experimental set-up and an evaluation method for determining temperature dependent thermal conductivities from one-dimensional steady-state temperature distributions are presented. The method is validated by obtaining continuous values for the thermal conductivities of pure Ni in the temperature range between 440 K and 740 K, brass (Cu-30Zn) in the temperature range between 350 K and 650 K and a titanium aluminide (TiAl-TNM) in the temperature range between 400 K and 700 K. The results are in agreement with available literature data. The reported scatter in the literature on conductivities is caused by microstructural or/and compositional differences, which highlights the necessity for swift and accurate experimental determination of thermal properties. For this, the proposed temperature gradient evaluation method is especially suited as it allows the direct determination of thermal properties within large temperature intervals using only a single experimental run. The experimental effort for a comprehensive study of a material is thus drastically reduced as compared to the conventional method of determining thermal conductivity from measured thermal diffusivities and heat capacities. The experimental set-up additionally allows the independent determination of thermal diffusivity as function of temperature. No prior knowledge of any material properties of a given sample is necessary.

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Section: Measurements In Ni Cu-30zn and Tial-tnmsupporting

confidence: 77%

Section: Experimental Set-upmentioning

confidence: 99%