Owing to the high concentration of reactant B and long residence time, the minimum concentration of reactant A appears in the bottom at the left side for the TLTR and TLBR and in the bottom at the right side for the BLBR and BLTR.
Moreover, the concentration distributions of reactant B and the reaction product make the SFOAE rise along a clockwise path for the TLTR and TLBR, although the concentration distribution of reactant A may result in its decrease along this path.
It can be seen that the SFOAE rises rapidly in the bottom region, remains stable in the middle region, and descends in the top region for the TLTR and TLBR; it also descends in the bottom region, rises in the middle region, and remains stable in the top region for the BLBR and BLTR.
It can be seen that the rise of outdoor airflow promotes the mean SFOAE to increase for the TLTR, TLBR, and BLTR and decrease for the BLBR.
It can be found that the increase of reactant A concentration for outdoor air of ventilation at the inlet causes the mean SFOAE to rise and then descend for the TLTR but to rise for the TLBR and descend for the BLBR and BLTR.