El Instituto Politécnico Nacional
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http://repositoriodigital.ipn.mx/handle/123456789/11668| Título : | ThermalWave Resonator Cavity Applied to the Study of the Thermal Diffusivity of Coffee Infusions |
| Palabras clave : | Coffee infusions |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | Springer Science+Business Media |
| Descripción : | Abstract Among the photothermal methods, the photopyroelectric technique, in its
several experimental configurations, has been extensively used tomeasure the thermal
properties of liquids, mainly the thermal effusivity and diffusivity. In this paper, the
use of the so-called thermal wave resonator cavity method, in the cavity-length-scan
mode, to measure the thermal diffusivity of commercial coffee infusions with samples
at different concentrations and degrees of degradation induced by heating cycles is
reported. A linear relationship between the logarithm of the pyroelectric signal amplitude
and the sample thickness was observed, in agreement with the basic theory for the
experimental configuration used here, from which the thermal diffusivity values of the
samples were obtained. The thermal diffusivity was found to be almost independent of
the coffee concentration in water but that this parameter is sensitive to sample modifications
induced by degradation. This work represents another step to demonstrate the
capability of the used method for characterization of the thermal properties of liquids. Instituto politecnico Nacional CONACYT |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/11668 |
| Otros identificadores : | http://hdl.handle.net/123456789/1189 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| IJTP_Marin_2009.pdf | 43.35 kB | Adobe PDF | Visualizar/Abrir |
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