Abstract
A measuring method of the thermal diffusivity with high temporal and spatial resolutions has been studied. The forced Rayleigh scattering method is an optical technique to measure the thermal diffusivity of solids and liquids. Based on its characteristics, this method has the applicability to become a “thermal diffusivity real-time monitoring system.” The maximum repetition rate of thermal diffusivity measurement is determined by the attenuation of an excited temperature distribution by laser heating, and a mathematical model of three-dimensional heat conduction is constructed. The temporal resolution of continuous measurements was improved to about 1 s, and the sol-gel transition of a gellan gum aqueous solution was studied to check the validity of the dynamic measurement of thermal diffusivity. Through the gelation process, the dynamical change of the thermal diffusivity was measured, and the gelation point of the solution was identified from a series of thermal diffusivity data. The results indicate the capability of the forced Rayleigh scattering method to be a real-time thermal diffusivity measurement technique for monitoring the rapidly changing process of a material.
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REFERENCES
W. A. Wakeham, A. Nagashima, and J. V. Sengers, eds. Measurement of the Transport Properties of Fluids, Experimental Thermodynamics (Blackwell Scientific Pubs., London, 1991), Vol. 3, pp. 111-192.
F. Righini and A. Cezairliyan, High Temp.-High Press. 5:481(1973).
D. P. Almond and P. M. Patel, Photothermal Science and Techniques, Physics and its Applications (Chapman & Hall, London, 1996), Vol. 10, pp. 199-214.
A. Leipertz, Int. J. Thermophys. 9:897(1988).
M. Motosuke and A. Nagashima, Proc. 16th Euro. Conf. Thermophys. Prop. (2002), p. 248.
H. J. Eichler, P. Gunter, and D. W. Pohl, Laser-Induced Dynamic Gratings, Springer Series in Optical Sciences (Springer-Verlag, Berlin, 1986), Vol.50, pp. 84-89.
G. Wu, M. Fiebig, and J. Wang, Fluid Phase Equilib. 88:239(1993).
E. V. Ivakin, A. V. Sukhodolov, V. G. Ralchenko, and A. V. Khomich, Quant. Electron. 32:367(2002).
Y. Nagasaka, T. Hatakeyama, M. Okuda, and A. Nagashima, Rev. Sci. Instrum. 59:1156(1988).
H. S. Carslaw, and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. (Oxford, London, 1959), pp. 353-386.
J. E. Bertie and Z. Lan, Appl. Spectrosc. 50:1047(1996).
T. Makino, M. Edamura, A. Kato, and A. Yoshida, Proc. 11th Jpn. Symp. Thermophys. Prop. (1990), p. 243 (in Japanese).
R. Chandrasekaran, A. Radha, and V. G. Thailambal, Carbohydr. Res. 224:1(1992).
M. L. V. Ramires, C. A. Nieto de Castro, Y. Nagasaka, A. Nagashima, M. J. Assael, and W. A. Wakeham, J. Phys. Chem. Ref. Data 24:1377(1995).
W. Wagner and A. Pruß, J. Phys. Chem. Ref. Data 31:387(2002).
S. Otsubo, T. Ibata, Y. Nagasaka, and A. Nagashima, Trans. Jpn. Soc. Mech. Eng. B64:184(1998) (in Japanese).
Y. Izumi, S. Saito, and K. Soma, Progr. Colloid Polym. Sci. 114:48(1999).
E. Miyoshi and K. Nishinari, Progr. Colloid Polym. Sci. 114:68(1999).
K. Nishinari, Colloid Polym. Sci. 275:1093(1997).
M. Akutu, K. Kubota, and K. Nakamura, Progr. Colloid Polym. Sci. 114:56(1999).
M. Matsukawa, Z. Tang, and T. Watanabe, Progr. Colloid Polym. Sci. 114:15(1999).
Y. Liu and R. B. Pandey, J. Chem. Phys. 105:825(1996).
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Motosuke, M., Nagasaka, Y. & Nagashima, A. Measurement of Dynamically Changing Thermal Diffusivity by the Forced Rayleigh Scattering Method (Measurement of Gelation Process). International Journal of Thermophysics 25, 519–531 (2004). https://doi.org/10.1023/B:IJOT.0000028487.62096.b7
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DOI: https://doi.org/10.1023/B:IJOT.0000028487.62096.b7