An experimental study on heat transfer characteristics for a horizontal tubular array in a high-temperature fluidized bed

Abstract

Experiments were performed with an array of horizontal tubes, arranged in a regular equilateral triangular pattern, immersed in a fluidized bed. Three different bed operating temperatures were used, these being 705, 761 and 812 K. Data are reported for heat transfer between the bed and a centrally-located tube in the array. Both total and radiative heat transfer rates were measured for three different sizes of particles and for superficial velocities spanning the range from packed bed conditions to over twice the minimum fluidization velocity. Local heat transfer values, measured around the tube periphery, and integrated averages are reported for all test conditions.