Thermal Imaging To Visualize and Characterize Combustion Fronts in Porous Media
2020
We
developed a novel technique based upon time-lapse infrared (IR)
images to relate the effects of crude-oil oxidation kinetics on flow during one-dimensional
homogeneous and heterogeneous laboratory-scale combustion tube experiments.
We performed combustion tube experiments under variable conditions
including different sands (i.e., grain-size distribution), air injection
rate history (constant versus variable), degree of packing heterogeneity,
and reaction heterogeneity. The latter is achieved by using reaction
enhancing nanoparticles in controlled packing configurations. During
every experiment, we obtain high-resolution IR images of the outer
wall of the combustion tube that we calibrate using point-wise temperature
measurements from a thermocouple. Here, a new experimental workflow
that uses these images and combines knowledge obtained from kinetic
cell experiments is used to isolate the spatial zones within the tube
where so-called low-temperature and high-temperature oxidation (pseudoreaction
regimes) occurs during combustion tube experiments for the first time.
Additionally, the IR imaging technique is shown to provide new insight
into the propagation of the combustion front in homogeneous and heterogeneous
systems and, importantly, visualizes gravity drainage of hot oil.
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