Determining Thermal Conductivity and Thermal Diffusivity of Low-Density Gases Using the Transient Short-Hot-Wire Method

Woodfield, Peter; Fukai, Jun; Fujii, Minoru; Takata, Yasuyuki; Shinzato, K.

doi:10.1007/s10765-008-0468-z

Cited by 30 publications

(32 citation statements)

References 17 publications

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“…The method used by Woodfields (12) for determination of λ and α in a short-hot-wire method was extended to a three-parameters problem. The algorithm is as follows:…”

Section: Simultaneous Determination Of λ α and δmentioning

confidence: 99%

“…This method has been applied to measure a variety of materials such as aluminum foams (5) , insulation materials (6) , the fused silica (7) , carbon steel (7) , halide crystal (7) , polyethylene foams (8) , coated paper (9) , agricultural materials (10) , non-metal (11) . The transient hot-wire technique (12) , instead of the hot-disk technique, has been used as well. The difference is that the hot wire assumes an infinitely long line source in a specimen as an ideal situation while the hot disk supposes a plane heat source (4,12) .…”

Section: Introductionmentioning

confidence: 99%

“…The transient hot-wire technique (12) , instead of the hot-disk technique, has been used as well. The difference is that the hot wire assumes an infinitely long line source in a specimen as an ideal situation while the hot disk supposes a plane heat source (4,12) .…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Thermal Conductivity and Thermal Diffusivity of Solid Materials Using a Novel Stamp Sensor: A Feasibility Study with Numerical Analysis

Hadi

Nishitani

Wijayanta

et al. 2012

JTST

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Contact-probe methods have been developed to measure thermal transport properties of solid materials. Although they have an advantage of being used for non-destructive in-situ measurement, it has a substantial problem that the measured results are influenced by thermal contact between the probe and the specimen. To overcome this problem, we proposed a new technique using a gel to eliminate the contact resistance. A unique feature of the method is that a thin film heater is fabricated on a substrate at the bottom of a shallow cavity, which provides a gel layer of the thickness that is almost the same as the cavity depth. When we use this sensor, we press it against a surface of a specimen with a gel in between. We named it "stamp sensor" from its supposed use and appearance. The thermal conductivity and the thermal diffusivity of a specimen and the thickness of the gel layer are determined simultaneously by comparing the measured temperature rise of the sensor with that obtained by numerical analysis. The objective of the present paper is to demonstrate the feasibility of the method by virtual experiments. The process to determine the thermal conductivity and the thermal diffusivity was examined using simulated experimental data that have been generated from the temperature rise of the sensor obtained by numerical analyses with given artificial scattering. Effects of the scattering of the data, the heating power and the heating time on the measurement error were also discussed.

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“…The method used by Woodfields (12) for determination of λ and α in a short-hot-wire method was extended to a three-parameters problem. The algorithm is as follows:…”

Section: Simultaneous Determination Of λ α and δmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Thermal Conductivity and Thermal Diffusivity of Solid Materials Using a Novel Stamp Sensor: A Feasibility Study with Numerical Analysis

Hadi

Nishitani

Wijayanta

et al. 2012

JTST

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“…(7)), where we need to find λ and α such that S non-linear is minimized. To solve a somewhat similar non-linear problem, Woodfield et al [7] recently proposed a curve-fitting procedure to find λ and α in the transient short-hot-wire method. We follow a similar approach here except that the voltage from Eq.…”

Section: Curve-fitting Algorithmmentioning

confidence: 99%

A Procedure for Application of the Three-Omega Method to Measurement of Gas Thermal Conductivity

Yusibani

Woodfield²,

Moroe

et al. 2009

JTST

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A non-linear least-squares curve-fitting procedure is proposed to analyze three-omega voltage data from a fine wire in a gas sample using the three-omega method. The method uses both three-omega components of the voltage arising from a sinusoidal heating current to determine the thermal conductivity of the surrounding medium. The proposed procedure is tested against simulated data and some experimental data for air at atmospheric pressure. Treating the technique as an absolute method and assuming a known sample heat capacity, the thermal conductivity of air has been measured at room temperature to within 11% of a reference value. Practical application of the method may require a calibrated effective wire length and wire diameter. An average wire temperature rise of around 10 K to ensure the three-omega components is enough for accurate measurement.

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“…Recently the transient short-hot-wire method was extended by the present authors [5] to make it applicable to low-density gases and conditions, where the temperature rise is no longer a linear function of the logarithm of time. An algorithm was developed based on the Gauss-Newton nonlinear least-squares method to simultaneously determine thermal conductivity and thermal diffusivity.…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Analytical Solution for the Transient Short-Hot-Wire Method

et al. 2008

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Unlike the conventional transient hot-wire method for measuring thermal conductivity, the transient short-hot-wire method uses only one short thermalconductivity cell. Until now, this method has depended on numerical solutions of the two-dimensional unsteady heat conduction equation to account for end effects. In order to provide an alternative and to confirm the validity of the numerical solutions, a twodimensional analytical solution for unsteady-state heat conduction is derived using Laplace and finite Fourier transforms. An isothermal boundary condition is assumed for the end of the cell, where the hot wire connects to the supporting leads. The radial temperature gradient in the wire is neglected. A high-resolution finite-volume numerical solution is found to be in excellent agreement with the present analytical solution.

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Determining Thermal Conductivity and Thermal Diffusivity of Low-Density Gases Using the Transient Short-Hot-Wire Method

Cited by 30 publications

References 17 publications

Measurement of Thermal Conductivity and Thermal Diffusivity of Solid Materials Using a Novel Stamp Sensor: A Feasibility Study with Numerical Analysis

Measurement of Thermal Conductivity and Thermal Diffusivity of Solid Materials Using a Novel Stamp Sensor: A Feasibility Study with Numerical Analysis

A Procedure for Application of the Three-Omega Method to Measurement of Gas Thermal Conductivity

A Two-Dimensional Analytical Solution for the Transient Short-Hot-Wire Method

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