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Semi-automatic non-commercial instrument for determining the thermal conductivity
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SYSNO ASEP 0557207 Document Type L - Prototype, Functional Specimen R&D Document Type Prototype, Functional Specimen RIV Subspecies Functional Specimen Title Semi-automatic non-commercial instrument for determining the thermal conductivity Author(s) Hrubý, Jan (UT-L) RID, ORCID
Kordík, Jozef (UT-L) RID, ORCID
Nikl, Zbyněk (UT-L)Number of authors 3 Year of issue 2022 Int.Code INV22-052 Technical parameters rozsah teplot měřené kapaliny: 20 - 60°C, max. tlak v zařízení: 2 bar Economic parameters Zařízení umožňuje měřit tepelnou vodivost kapalin bez některých parazitních jevů, které se vyskytují u standardních metod (usazování, termoforéza). Owner Name Ústav termomechaniky AV ČR v. v. i. Registration Number of the result owner 61388998 Applied result category by the cost of its creation A - Vyčerpaná část nákladů <= 5 mil. Kč License fee fee N - Poskytovatel licence nepožaduje licenční poplatek Internal identification code of the product assigned by its creator, Regulation no., INV22-052 Language eng - English Country CZ - Czech Republic Keywords thermal conductivity ; the Nusselt number ; heat transfer coefficient Subject RIV BJ - Thermodynamics OECD category Thermodynamics R&D Projects TH03020313 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UT-L - RVO:61388998 Annotation The subject of the functional sample is a device serving for measurement of thermal conductivity of liquids. A tested liquid flows through the device, whose measuring part is formed by a bundle of parallel circular channels. The liquid flows through the channels at flow rate, that is chosen so that a laminar regime is achieved in each channel. A known amount of heat flux is being added to the liquid along a certain sector of the channel bundle. Since the heat transfer parameters for laminar circular flow are exactly known, the thermal conductivity of the tested liquid can be evaluated from the measured flow rate, added heat flux, and temperature differences.
This method is specifically suitable for liquids containing some particles. As the measured liquid is in continuous motion during the measurement, the sedimentation of particles and other phenomena such as thermophoresis (particle motion due to temperature gradients), which are problematic with the static methods, are avoided.
All process parameters are recorded and controlled by a computer with inhouse developed software. Consequently, the measuring procedure can be automated, with exception of cleaning, filling and similar operations.Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2023
Number of the records: 1