EFFECT OF SPACE DISTRIBUTION AROUND PARTI CLE ON CONVECTIVE HEAT-TRANSFER COEFFICIENT OF PACKED-BEDS

Convective heat transfer coefficient between a spherical particle and a liquid in packed beds were measured for the range of 77 less than or equal to Re less than or equal to 2000. The convective heat transfer coefficients measured by this work were quite smaller than the values obtained by the empirical equations proposed previously. Therefore, fl ow visualization was carried out to investigate the water flow around the particle in the packed beds. Temperature distribution and velocity of water in packed beds were also investigated by the numerical simul ation. It was found that the space around the particle, especially the space at the flank of the particle causes decrease of convective heat transfer coefficient between a spherical particle and a liquid in pac ked beds.