We investigate the presence of local thermal non-equilibrium (LTNE) effects during heat flow in porous media. In this study, we present (1) an advanced laboratory experiment to investigate granular-scale heat transport by measuring temperature responses in fluid and solid phases using varying grain sizes (5–30 mm) and flow velocities (3–23 m d−1) under step-like temperature changes; (2) an analysis of experimental data to elucidate the influence of grain size and flow velocity on heat transport in porous media, evaluating the presence of LTNE effects; and (3) an interpretation of the experimental results using heat transport models, with two-phase heat transport being described by standard models in the literature.
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