Heat transfer to vertical gas-solid suspension flows

Heat transfer and flow characteristics of gas-solid suspension flows in a vertical 26 mm I.D. tube were investigated using spherical glass and copper beads. Particle size ranged from 72 to 1130 microns; Reynolds number 12,000 to 24,000; and loading ratios of solids up to 10. The results indicated a slight increase in the wall-heat transfer coefficient for the glass beads at the higher loading ratios, and essentially no increase for the 321-micron copper beads for the range of variables covered. A new general correlation of wall-heat transfer coefficients to gas-solid suspensions is presented for uniform wall temperature conditons. (auth.)