TY - JOUR
T1 - Thermal effusivity measurements for liquids
T2 - A self-consistent photoacoustic methodology
AU - Balderas-López, J. A.
N1 - Funding Information:
The author thanks the support of CONACyT and COFAA-IPN for the realization of this work.
PY - 2007
Y1 - 2007
N2 - A self-consistent photoacoustic methodology for the measurement of the thermal effusivity for liquids is presented. This methodology makes use of the analytical solution for the one-dimensional heat diffusion problem for a single layer, assuming a harmonic heat source in the surface absorption limit. The analytical treatment involves fitting procedures over normalized amplitudes and phases, obtained as the ratio of photoacoustic signals in the front configuration with and without the liquid sample, as functions of the modulation frequency. Two values of thermal effusivity for each liquid sample are obtained, one from the analysis of the normalized amplitudes and the other one from the normalized phases. The comparison between the experimental and theoretical phases allows the description of a simple criterion for deciding on the appropriate modulation frequency range for the analysis in each case. This methodology was applied for measuring the thermal effusivity of some pure liquids; a very good agreement between the thermal effusivity values obtained by this methodology and the corresponding ones reported in the literature was obtained.
AB - A self-consistent photoacoustic methodology for the measurement of the thermal effusivity for liquids is presented. This methodology makes use of the analytical solution for the one-dimensional heat diffusion problem for a single layer, assuming a harmonic heat source in the surface absorption limit. The analytical treatment involves fitting procedures over normalized amplitudes and phases, obtained as the ratio of photoacoustic signals in the front configuration with and without the liquid sample, as functions of the modulation frequency. Two values of thermal effusivity for each liquid sample are obtained, one from the analysis of the normalized amplitudes and the other one from the normalized phases. The comparison between the experimental and theoretical phases allows the description of a simple criterion for deciding on the appropriate modulation frequency range for the analysis in each case. This methodology was applied for measuring the thermal effusivity of some pure liquids; a very good agreement between the thermal effusivity values obtained by this methodology and the corresponding ones reported in the literature was obtained.
UR - http://www.scopus.com/inward/record.url?scp=34547240965&partnerID=8YFLogxK
U2 - 10.1063/1.2744333
DO - 10.1063/1.2744333
M3 - Artículo
SN - 0034-6748
VL - 78
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 6
M1 - 064901
ER -