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This work experimentally investigated the heat transfer of a rotating porous cylinder under a circular impinging jet at the confined/unconfined conditions. The 0.93-porosity and 0.90-porosity aluminum foams were used. The dimensions of the Al-foam cylinder were 40 mm in diameter (D) and 20 mm in height (H) excepting the 4 mm-thickness spreader. Air was employed as the coolant. The diameter (d) of...