The multiphase flow leads a non-uniform distribution of catalyst particles in a slurry reactor. The previous studies used the inlet catalyst loading to compute the absorption coefficient and the scattering coefficient in the slurry reactor, which did not consider the non-uniform distribution of catalyst particle. The present study numerically studies the effect of multiphase flow on the radiation distribution in a slurry reactor. Herein, the absorption coefficient and the scattering coefficient are related to the local volume fraction of catalyst. The volume fraction of catalyst is obtained using the Eulerian-Eulerian method. The radiative transfer equation is solved using the DO model. Results show that the local catalyst loading are non-uniform in the slurry reactor. The reactor-averaged catalyst loading is always less than the inlet catalyst loading. It may leads to the underestimation of the incident radiation as well as UV disinfection and the overestimation of LVREA and as well as photocatalytic reaction rate. It is more reasonable to compute the absorption coefficient and the scattering coefficient using the local catalyst loading. A large diameter and a large inlet catalyst loading can lead to a large catalyst loading in the reactor, the large absorption coefficient and scattering coefficient, meaning a low radiation intensity in the reactor. There exists an optimal inlet catalyst loading for the photocatalytic reaction.

多相流导致淤浆反应器中催化剂颗粒的不均匀分布。先前的研究使用入口催化剂负载量来计算淤浆反应器中的吸收系数和散射系数，这并未考虑催化剂颗粒的不均匀分布。本研究数值研究了淤浆反应器中多相流对辐射分布的影响。在此，吸收系数和散射系数与催化剂的局部体积分数有关。催化剂的体积分数使用欧拉-欧拉方法获得。使用DO模型求解辐射传递方程。结果表明在淤浆反应器中局部催化剂的负载是不均匀的。反应器平均催化剂负载量始终小于进口催化剂负载量。它可能导致低估入射辐射，紫外线消毒以及高估LVREA和光催化反应速率。使用局部催化剂负载来计算吸收系数和散射系数更为合理。大直径和大入口催化剂负载可导致反应器中催化剂负载大，吸收系数和散射系数大，这意味着反应器中辐射强度低。存在用于光催化反应的最佳入口催化剂负载量。使用局部催化剂负载来计算吸收系数和散射系数更为合理。大直径和大入口催化剂负载可导致反应器中催化剂负载大，吸收系数和散射系数大，这意味着反应器中辐射强度低。存在用于光催化反应的最佳入口催化剂负载量。使用局部催化剂负载来计算吸收系数和散射系数更为合理。大直径和大入口催化剂负载可导致反应器中催化剂负载大，吸收系数和散射系数大，这意味着反应器中辐射强度低。存在用于光催化反应的最佳入口催化剂负载量。