Study on Flow in Moving Bed Heat Exchanger Element

Granular flow with heat transfer in moving bed heat exchanger element is numerically simulated by Euler-Euler method in current work. The influence of particles density, special heat capacity, velocity, conductivity and diameter on heat transfer is analyzed. The results show that, average heat transfer coefficient between particles and tube would increase with the increasing of density, special heat capacity, velocity, while the efficiency would decrease. The increasing of conductivity would make heat transfer coefficient and efficiency all increase, but the positive effect on heat transfer coefficient is less. Contact heat resistance would rapidly increase with increasing of diameter, while penetration heat resistance would decrease. In order to enhance heat transfer, penetration heat resistance should be weaken for smaller particles, while contact heat resistance should be weaken for larger particles.