A novel theoretical model for calculating the effective diffusivity of gases in a porous pellet composed of two different grains

作者：Abolpour Bahador; Afsahi M Mehdi^*; Kumar R Vasant

来源：Research on Chemical Intermediates, 2012, 38(7): 1455-1465.

DOI：10.1007/s11164-011-0476-7

• Effective diffusivity
• Theoretical model
• Gas-solid diffusion
• Two different grains
• Porous pellet

Effective diffusivity of gases is an important property when modeling the physicochemical processes occurring in a pellet. Calculating effective diffusivity in a pellet composed of a mixture of particles is a difficult task. In this paper, a theoretical model is presented in order to describe the diffusion of gases in a porous pellet made up of a mixture of two kinds of solid grain. Solid grains can either be fully dense and thus non-porous or contain pores, with a grain being sub-divided into sub-grains. The results predicted by the model have been evaluated and validated by use of experimental data obtained by reduction of cuprous sulfide in the presence of lime. Finally, the effects of structural properties and operating conditions on the effective diffusivity of the gases in the pellet have been evaluated.

• 出版日期2012-9