PULsE: An open-source software for laser flash analysis

Efficient thermal insulation at high temperatures poses stringent requirements on suitable materials. Low density, porous inorganic structures with pore sizes in the sub‐micrometer range are of particular interest for such materials to control heat conduction. Simultaneously, thermal radiation has to be suppressed, which depends on the optical properties of the constituents. Here, the authors demonstrate a direct observation of the transition from a conduction dominated to a radiation dominated thermal transport mechanism for the case of particulate silica materials at temperatures reaching up to 925 °C. A detailed analysis of the radiative transport through bulk silica as well as solid and hollow silica particles is provided. Optical transparency at high temperatures is the driving force, whereas surface wave modes barely contribute, particularly in case of the insulating particle packings. The existing analytical framework of laser flash analysis is extended to qualitatively describe the radiative and conductive heat transport by two independent diffusive transport models. The analysis provides a better understanding of the challenges to fabricate and analyze efficient thermal insulation materials at high operating temperatures, where multiple heat transport mechanisms need to be controlled.

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“…found a similar effect on alumina samples above 1000 °C and established a numerical model for their data. [ 24 ]…”

Section: Resultsmentioning

confidence: 99%

High‐Temperature Thermal Transport in Porous Silica Materials: Direct Observation of a Switch from Conduction to Radiation

Neuhöfer

Herrmann

Lebeda

et al. 2021

Adv Funct Materials

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“…After collecting the time-temperature profiles T (t), the latter were exported in a csv format and loaded into PULsE [22] (version 1.93F [23]), an open-source numerical analysis software, to extract the thermal diffusivity values from the raw data. The data was processed with a "Penetration model", which accounted for a spatially distributed absorption of the laser pulse at the sample front, and distributed emission of the thermal radiation measured by the detector at the rear of the sample.…”

Section: Methodsmentioning

confidence: 99%

Avoiding Natural Convection in Laser-Flash Experiments

Lauerer¹,

Lunev²

2022

SSRN Journal

Self Cite

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“…The time-temperature profiles recorded by the instrument were exported in a csv file format and processed with the PULsE (Processing Unit for Laser flash Experiments) [28] open-source software (version 1.93F [29]). The selected problem statements were "Classical 2D", referred to as the "Standard" model in this text to preserve the naming convention introduced in Proteus LFA Analysis, and the "Penetration 1D" (both models are documented in the software manual).…”

Section: Laser Flash Analysis (Lfa)mentioning

confidence: 99%