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Assessment of modulated hot wire method for thermophysical characterization of fluid and solid matrices charged with (nano)particle inclusions

Chirtoc, Mihai; Henry, Jean F.; Turgut, Alpaslan; Tavman, Ismail H.; Hadjov, Kliment B.; Schuchmann, Heike P.; Sauter, Caroline; Antoniow, Jean S.; Fudym, Olivier; Tavman, Şebnem

Recently we reported on simultaneous thermal conductivity k and thermal diffusivity a measurement of liquids and in particular of nanofluids in a configuration using an ac excited hot wire combined with lock-in detection of the third harmonic (3ω method) [1]. The conductive wire is used as both heater and sensor. The requirements for the asymptotic validity of the line heat source model are fulfilled at low modulation frequencies below a few Hz. The study of the relative sensitivity of signal amplitude and phase to changes in k and a indicates that there is an optimum frequency range for accurate and stable results. We extend by up to two decades the feasible frequency range for 3ω measurements by considering various more elaborate models for the heat transfer between the wire and the fluid. Finally we show that the same ac hot wire method can be applied to soft solid, composite materials. We measured the k enhancement of a poly(ethylene vinyl acetate) EVA polymer matrix charged with various fractions of graphite.

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Verlagsausgabe §
DOI: 10.5445/IR/1000132226
Veröffentlicht am 30.04.2021
DOI: 10.1088/1742-6596/214/1/012135
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2010
Sprache Englisch
Identifikator ISSN: 1742-6588, 1742-6596
KITopen-ID: 1000132226
Erschienen in Journal of physics / Conference series
Verlag IOP Publishing
Band 214
Seiten Art. Nr.: 012135
Nachgewiesen in Scopus
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