Intercomparison of thermal conductivity and thermal diffusivity methods for plastics

Rides, M; Morikawa, Junko; Hälldahl, Lars; Hay, Bruno; Lobo, Hubert; Dawson, Angela; Allen, C R G

doi:10.1016/j.polymertesting.2009.03.002

Cited by 56 publications

(24 citation statements)

References 9 publications

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“…Several methods, as reviewed elsewhere (Tritt & Weston, 2004) and (Rides et al, 2009), have been proposed and used for measurement of the thermal conductivity of polymers and composites. Classical steady-state methods measure the temperature difference across the specimens in response to an applied heating power, either as an absolute value or by comparison with a reference material put in series or in parallel to the sample to be measured.…”

Section: Methods For Thermal Conductivity Measurementsmentioning

confidence: 99%

Thermal Conductivity of Nanoparticles Filled Polymers

Ebadi‐Dehaghani¹,

Nazempour²

2012

Smart Nanoparticles Technology

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Section: Methods For Thermal Conductivity Measurementsmentioning

confidence: 99%

Thermal Conductivity of Nanoparticles Filled Polymers

Ebadi‐Dehaghani¹,

Nazempour²

2012

Smart Nanoparticles Technology

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“…Classical techniques to measure thermal conductivity may be regrouped in two main categories, namely steady-state and transient techniques [4] [5]. Steadystate approaches are usually based on parallel plate techniques such as the guarded hot plate [6] or guarded heat flow meter [7].…”

Section: Bibliographymentioning

confidence: 99%

Measurement of the In-Plane Thermal Conductivity of Long Fiber Composites by Inverse Analysis

Assaf¹,

Sobotka²,

Trochu³

2017

OJCM

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In the present work, inverse thermal analysis of heat conduction is carried out to estimate the in-plane thermal conductivity of composites. Numerical simulations were performed to determine the optimal configuration of the heating system to ensure a unidirectional heat transfer in the composite sample. Composite plates made of unsaturated polyester resin and unidirectional glass fibers were fabricated by injection to validate the methodology. A heating and cooling cycle is applied at the bottom and top surfaces of the sample. The thermal conductivity can be deduced from transient temperature measurements given by thermocouples positioned at three chosen locations along the fibers direction. The inverse analysis algorithm is initiated by solving the direct problem defined by the one-dimensional transient heat conduction equation using a first estimate of thermal conductivity. The integral in time of the square distance between the measured and predicted values is the criterion minimized in the inverse analysis algorithm. Finally, the evolution of the in-plane composite thermal conductivity can be deduced from the experimental results by the rule of mixture.

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“…Previous tests on glycerol samples carried out with the probes manufactured by the Thermophysical Laboratory of the University of Rome "Tor Vergata" led to similar results. A better accuracy can be obtaining by calibration [16][17], i.e. assuming a constant deviation due to thermal probe construction and properties, generally not perfectly known.…”

Section: Thermal Diffusivity and Specific Heatmentioning

confidence: 99%

Thermal conductivity and thermal linear expansion measurements on molten salts for assessing their behaviour as heat transport fluid in thermodynamics solar systems

Coppa

Bovesecchi

Fabrizi³

2010

SPIE Proceedings

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Molten salts (sodium and potassium nitrides) are going to be used in many different plants as heat transferring fluids, e.g. concentration solar plants, nuclear power plants, etc. In fact they present may important advantages: their absolute safety and non toxicity, availability and low cost. But their use, e.g. in the energy receiving pipe in the focus of the parabolic mirror concentrator of the solar thermodynamic plant, requires the accurate knowledge of the thermophysical properties, above all thermal conductivity, viscosity, specific heat and thermal linear expansion, in the temperature range 200°C÷600°C. In the new laboratory by ENEA Casaccia, SolTerm Department all these properties are going to be measured.\ud Thermal conductivity is measured with the standard probe method (linear heat source inserted into the material) manufacturing a special probe suited to the foreseen temperature range (190-550°C). The probe is made of a ceramic quadrifilar pipe containing in different holes the heater (Ni wire) and the thermometer (type J thermocouple). \ud The thermal linear expansion will be measured by a special system designed and built to this end, measuring the sample dilatation by the reflection of a laser beam by the bottom of the meniscus in the liquid solid interface.\ud The viscosity will be evaluated detecting the start of the natural convection in the same experiment as to measure thermal conductivity.\ud In the paper the construction of the devices, the results of preliminary tests and an evaluation of the obtainable accuracy are reported

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Intercomparison of thermal conductivity and thermal diffusivity methods for plastics

Cited by 56 publications

References 9 publications

Thermal Conductivity of Nanoparticles Filled Polymers

Thermal Conductivity of Nanoparticles Filled Polymers

Measurement of the In-Plane Thermal Conductivity of Long Fiber Composites by Inverse Analysis

Thermal conductivity and thermal linear expansion measurements on molten salts for assessing their behaviour as heat transport fluid in thermodynamics solar systems

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