Monotonic Heating Regime Methods for the Measurement of Thermal Diffusivity

Волохов, Г. М.; Kasperovich, A. S.

doi:10.1007/978-1-4615-6678-6_13

Cited by 5 publications

(19 citation statements)

References 9 publications

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“…Taking a derivation of the right side of Eq. , one can write

\frac{1}{α ((), T)} \frac{\partial T ((),, x, t)}{\partial t} = \frac{\partial^{2} T ((),, x, t)}{\partial x^{2}} + \frac{1}{λ ((), T)} \frac{d λ ((), T)}{d T} {(\frac{\partial T ((),, x, t)}{\partial t})}^{2},

where

a ((), T) = \frac{λ ((), T)}{C ((), T) ρ ((), T)} .

…”

Section: The Required Thermophysical Properties For Description Of Fimentioning

confidence: 99%

“…The heating rate, b , at every point of the sample, x , is constant and does not depend on temperature, T , and time, t . Because the space temperature distribution does not depend on time, this method is also named the ‘quasi‐steady‐state method’ .…”

Section: Description and Comparison Of The Linear And Monotonous Heatmentioning

confidence: 99%

“…The comprehensive review of the MMH is presented in the works . The MMH can be considered as a development and generalization of the methods based on linear heating, the theory underlining the measuring techniques pertaining to λ ( T ), α ( T ), C ( T ), ρ ( T ), and

\frac{\partial T ((),, x, t)}{\partial t}

in Eqs and .…”

Section: Description and Comparison Of The Linear And Monotonous Heatmentioning

confidence: 99%

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Measurement of thermophysical properties of fire‐resistive and reactive materials. Urgent problems and solutions

2016

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Summary The ASTM Standard Test Method E2584 ‘Standard Practice for Thermal Conductivity of Materials Using a Thermal Capacitance (Slug) Calorimeter’ was developed by National Institute of Standards and Technology to measure thermal conductivity of fire‐resistive and reactive materials during monotonic heating and cooling. The heating regime adopted in ASTM E2584 is very reasonable because change of materials' composition and structure during a fire can depend on kinetic factors and thermal story of the materials. The main problem in experimental measurements of thermophysical properties is the impossibility of using standard steady‐state methods during time‐dependent processes in materials accompanied by latent heat effect. Using standard transient methods, such as hot wire or laser flash methods, is also incorrect, because the transient measurement heat process can be started only after steady‐state temperature field is established in the sample, that is, at the time when the involved physical or chemical processes could be finished. The objectives of this paper are to review and to analyze scientific problems to be taken into account in the revised version of ASTM E2584 Standard. Examples of experimental results are presented for measurement of thermophysical properties during chemical and physical processes in solid materials, powders, metals, and ceramic materials; building materials during fire; and so on. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Taking a derivation of the right side of Eq. , one can write

\frac{1}{α ((), T)} \frac{\partial T ((),, x, t)}{\partial t} = \frac{\partial^{2} T ((),, x, t)}{\partial x^{2}} + \frac{1}{λ ((), T)} \frac{d λ ((), T)}{d T} {(\frac{\partial T ((),, x, t)}{\partial t})}^{2},

where

a ((), T) = \frac{λ ((), T)}{C ((), T) ρ ((), T)} .

…”

Section: The Required Thermophysical Properties For Description Of Fimentioning

confidence: 99%

Section: Description and Comparison Of The Linear And Monotonous Heatmentioning

confidence: 99%

\frac{\partial T ((),, x, t)}{\partial t}

in Eqs and .…”

Section: Description and Comparison Of The Linear And Monotonous Heatmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of thermophysical properties of fire‐resistive and reactive materials. Urgent problems and solutions

2016

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show abstract

“…2). The procedure is equivalent to application of 2 nd kind regular heating regime methodology (Volokhov & Kasperovich, 1984). Directly from Eq.…”

Section: One-dimensional Temperature Oscillation In Semi-infinite Rodmentioning

confidence: 99%

“…The theory of such a regime is the generalisation of well-known quasi-stationary conditions. Usually the first, second, and third kind of regimes are distinguished (Volokhov & Kasperovich, 1984;Platunov, 1992). The first two are also referred to as monotonic heating regimes.…”

Section: Theorymentioning

confidence: 99%

IR Support of Thermophysical Property Investigation - Study of Medical and Advanced Technology Materials

Panas¹

2012

Infrared Thermography

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Validation of the Thermal Diffusivity from Modified Monotonic Heating Regime Procedure

Panas

Sypek

2006

Int J Thermophys

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Problems of thermal diffusivity measurements when using monotonic heating regime methodology are discussed. A modification to a procedure applied to the specimen investigated at convective heat transfer conditions has been analyzed. Experiments are performed using two fluids of different thermal properties. By comparing the obtained data, it is possible to correct the negative effects of the finite Biot number. Results of test measurements performed on a PMMA cylindrical specimen are consistent with reference data, which demonstrates the reliability of the proposed modification. The suggested revisions in the measurement methodology have also been verified in the course of numerical simulations. It is concluded that high quality data can be obtained applying elementary experimental instrumentation and simple data processing.

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Monotonic Heating Regime Methods for the Measurement of Thermal Diffusivity

Cited by 5 publications

References 9 publications

Measurement of thermophysical properties of fire‐resistive and reactive materials. Urgent problems and solutions

Measurement of thermophysical properties of fire‐resistive and reactive materials. Urgent problems and solutions

IR Support of Thermophysical Property Investigation - Study of Medical and Advanced Technology Materials

Validation of the Thermal Diffusivity from Modified Monotonic Heating Regime Procedure

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