Experimental investigation of heat transfer from elliptic tubes heat exchanger immersed in a fluidized bed

Abstract In this work, heat transfer, wall-to-bed, characteristics from elliptic tubes exchangers, both inline and staggered arrangements, were studied experimentally. Bundles of twenty the same total surface area 0.015 m 2 a length 200 mm are immersed in bed granulated charcoal different grain sizes, 2, 4 6 mm. Air was used as fluidizing fluid. One these which made copper, instrumented, electrically heated positioned middle tube bundle, while others wooden dummy to be influenced only by presence neighbouring tubes. Measurements reported range fluidization number within 1 to1.4. The results showed that, local Nusselt around is about uniform with its maximum value at sides minimum stagnation rear points tube. addition, average increases increase decrease particle diameter. Heat transfer found improve bundle if compared arrangements. present pressure drop numbers validated numerical model conditions for case diameter Good qualitative quantitative agreements have been achieved between experimental data. Finally, correlation equations terms Nu, ratio deduced.