Published January 1, 2010
| Version v1
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Assessment of modulated hot wire method for thermophysical characterization of fluid and solid matrices charged with (nano)particle inclusions
Creators
- 1. Univ Reims, GRESPI, Lab Thermophys, BP 1039, F-51687 Reims, France
- 2. Dokuz Eylul Univ, Dept Mech Engn, TR-35100 Bornova, Turkey
- 3. Univ Chem Technol & Met, BG-35100 Sofia, Bulgaria
- 4. Univ Karlsruhe, Food Proc Engn, D-76131 Karlsruhe, Germany
- 5. RAPSODEE, Ecole Des Mines Albi, CNRS, UMR 2392, F-81013 Albi, France
- 6. Ege Univ, Dept Food Engn, TR-35100 Bornova, Turkey
Description
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 (3 omega 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 3 omega 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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