The study on the heat transfer characteristics between tube wall and slurry flowing through the ver-tical tube was investigated. To calculate heat transfer coefficient, experiments were conducted by varying slurry flow rate, particle size and concentration of particles and it was found that the rate of heat transfer in the slurry flow was larger than that in the simple water flow and it increased as the slurry flow rate and concentration of particles increased and particle size decreased. A heat transfer model considering the effect of the collision of suspended solid particles with its clinging film with the surface of copper tube was proposed and from which the heat transfer characteristics could be explained very well.