Experiment Study on Temperature Distribution in Water-Saturated Porous Media

An attractive approach for magnetic resonance imaging (MRI) thermograph has been used to investigate temperature distribution in water-saturated porous media (silica gel). Linear relationships between several temperature-sensitive MRI parameters (longitudinal relaxation time T (1), self-diffusion coefficient D) and temperature (T) are dependent on water saturation in pore-throat structure of the porous media. Based on the linear relationships, the parameters including T (1) and D were evaluated using T (1)-weighted spin echo (SE) sequences and diffusion-weighted SE sequences, respectively, to measure temperature distribution by two-point method. In this work, we conducted calibration experiments to get the T (1)-T relationship and D-T relationship, which were then validated by cooling experiments. In the calibration experiment, the determination coefficients for the sample using T (1) and self-diffusion coefficient methods are close to 1 in the temperature range from 0 to 60 A degrees C, although T (1) method is difficult for the nonlinear relationship between signal intensity (SI) and T (1).