Abstract
Heat-transfer coefficients in gas-liquid-solid three-phase flows in a 50.8mm i. d. vertical tube were measured in relation to flow patterns such as bubble, slug and penetrant flows. The gas velocity, slurry flow velocity and solid concentration were changed. The heat-transfer coefficients in the bubble and slug flow regime decreased with an increase in slurry flow velocity at low slurry flow velocity, while increased in the penetrant flow regime. The solid concentration greatly influenced the heat-transfer coefficients in all flow regimes, and the maximum value existed at a certain solid concentration.
