Contribution to the Transient Plane Source Method for Measuring Thermophysical Properties of Solids

Malinarič, Svetozár

doi:10.1007/s10765-013-1502-3

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…It is shown that for ITR between the sample and sensor in the physically relevant range for common interface, it has no influence on the identified sample thermal properties. The boundary conditions (BC) at the outer surfaces of the sample and the outer wall of the air in the gap were also examined, 24 to confirm that the finite-sized simulation domains adequately approximate the semi-infinite domains assumed in the analytical modelling. whether the far-field BC was thermally insulating or convective, with convection coefficient varied from 1 to 1000 W m -2 K -1 and with or without blackbody radiation, the differences in sensor temperature were always less than 0.1% throughout the entire simulation time t < tmax (tmax ~10 4 s for TI samples).…”

Section: Boundary Conditions and Radiation Effect On The Hot Disk Tpsmentioning

confidence: 99%

“…Previous works on the former aspect focused on the sensitivity of the input parameters and the data fitting procedure based on the original analytical model, but could not explain the overestimation of k in TI materials. [21][22][23][24][25][26] In the latter aspect, several publications investigated the accuracy and performance of commercial TPS devices based on numerical simulations to study the effect of the sensors on the TPS measurement for bulk or thin film 20,[27][28][29][30][31] and the error due to thermal radiation in semitransparent sample. 17,33 However, these researches provide no systematic investigation on the sensor geometric parameters and sample thermal properties.…”

mentioning

confidence: 99%

“…We first review the analytical Green's function solution of the ideal heat transfer problem and the analysis procedure and introduce a new analytical model for the problem which overcomes the known divergence issue near t = 0 in the original solution. 24,34 Then, by analyzing the k and C results identified from the numerically simulated hot disk TPS data following the standard, 9 we discuss the correlation between the geometric and thermal properties of the sensor and the systematic error due to the discrepancy between the analytical model and the actual heat transfer. To account for the realistic heat flow in hot disk TPS, we provide a correction function to improve the measurement accuracy for the implementation of common polyimide hot disk sensors (Kapton-5501F and Kapton-7577 from Thermtest®) is provided.…”

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confidence: 99%

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Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Zheng

Kaur

Dames

et al. 2020

International Journal of Heat and Mass Transfer

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The hot disk transient plane source (TPS) method is a widely used standard technique (ISO 22007-2) for the characterization of thermal properties of materials, especially the thermal conductivity, k. Despite its well-established reliability for a wide variety of common materials, the hot disk TPS method is also known to suffer from a substantial systematic errors when applied to low-k thermal insulation materials, because of the discrepancies between the idealized model used for data analysis and the actual heat transfer process. Here, we present a combined numerical and experimental study on the influence of the geometry of hot disk sensor on measured value of lowk materials. We demonstrate that the error is strongly affected by the finite thickness and thermal mass of the sensor's insulation layer was well as the corresponding increase of the effective heater size beyond the radius of the embedded metal heater itself. We also numerically investigate the dependence of the error on the sample thermal properties, confirming that the errors are worse in low-k samples. A simple correction function is also provided, which converts the apparent (erroneous) result from a standard hot disk TPS measurement to a more accurate value. A standard polyimide sensor was also optimized using both wet and dry etching to provide more accurate measurement directly. Experimentally corrected value of k for Airloy® x56 aerogel and a

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Section: Boundary Conditions and Radiation Effect On The Hot Disk Tpsmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Zheng

Kaur

Dames

et al. 2020

International Journal of Heat and Mass Transfer

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“…In this case, if the material tested is heterogeneous, test results could be unreliable. In turn, the transient methods, both the plane source and the hot wire, require the infinite in all direction and isotropic test sample 18 – 20 . Ensuring these conditions is very difficult.…”

Section: Experimentationmentioning

confidence: 99%

Experimental investigations on graphene oxide/rubber composite thermal conductivity

Wilk

Smusz

Filip

et al. 2020

Sci Rep

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Graphene oxide/rubber composites were experimentally investigated for obtaining their thermal properties. Three kinds of the composite matrix material have been used: NBR, HNBR and FKM. The reduced graphene oxide in the form of crumped flakes has been applied as the filler influencing on thermal conductivity of the composites. Two values of graphene oxide weight concentration have been taken into account in the investigation. Thermal conductivity of the composites and basic matrix has been measured by the professional apparatus with the use of the guarded heat plate method. Before measurements the preliminary tests using the simplified comparative method have been performed. The results obtained, both from preliminary tests and using the guarded heat plate method, show an increase in thermal conductivity with increasing the reduced graphene oxide content in the composite. The experimental investigation allowed to determine not only the increase in thermal properties of graphene oxide/rubber composites compared to the basic matrix, but also the absolute values of thermal conductivities. Additionally, the SEM analysis showed that the tested composite samples contain agglomerates of the rGO nanoparticles. The occurrence of agglomerates could affect the composite thermal properties. This was noticed in the comparatively measurements of the temperature of different composites during the heating of samples tested. The maximum enhancement of thermal conductivity obtained was about 11% compared to the basis matrix of the composites tested.

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“…The suggested pulsed measurement principle is derived from the Transient Plane Source (TPS) method [ 28 , 29 ]. The TPS method is a well known method for measuring the absolute thermal properties of various materials such as solids [ 29 , 30 , 31 , 32 , 33 , 34 ], fluids [ 35 ], powders [ 36 ] and thin films [ 37 , 38 ]. However, despite the wide use of this method, literature mentions no use of a pulsed method for dynamic biologically relevant monitoring applications.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Thermal Method for Monitoring Cell Proliferation in Real-Time

Bormans

Oudebrouckx

Vandormael

et al. 2021

Sensors

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The study of cell proliferation is of great importance for medical and biological research, as well as for industrial applications. To render the proliferation process accurately over time, real-time cell proliferation assay methods are required. This work presents a novel real-time and label-free approach for monitoring cell proliferation by continuously measuring changes in thermal properties that occur at the sensor interface during the process. The sensor consists of a single planar resistive structure deposited on a thin foil substrate, integrated at the bottom of a cell culture reservoir. During measurement, the structure is excited with square wave current pulses. Meanwhile, the temperature-induced voltage change measured over the structure is used to derive variations in the number of cells at the interface. This principle is demonstrated first by performing cell sedimentation measurements to quantify the presence of cells at the sensor interface in the absence of cell growth. Later, cell proliferation experiments were performed, whereby parameters such as the available nutrient content and the cell starting concentration were modified. Results from these experiments show that the thermal-based sensor is able to accurately measure variations in the number of cells at the interface. Moreover, the influence of the modified parameters could be observed in the obtained proliferation curves. These findings highlight the potential for the presented thermal method to be incorporated in a standardized well plate format for high-throughput monitoring of cell proliferation.

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Contribution to the Transient Plane Source Method for Measuring Thermophysical Properties of Solids

Cited by 18 publications

References 5 publications

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Experimental investigations on graphene oxide/rubber composite thermal conductivity

Pulsed Thermal Method for Monitoring Cell Proliferation in Real-Time

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