Unsteady SO2 Absorption by a Moving Water Aerosol with Chemical Dissociati
Transient chemical absorption dynamics of sulfur dioxide by a water aerosol droplet at three Reynolds numbers of 0.643, 1.287 and 12.87 are predicted. In this study, a sinusoidal velocity distribution at the droplet surface is assumed to approach the flow field inside the droplet and a single-phase simulation method (SPSM) is developed to compare with the two-phase simulation method (TPSM). Considering the physical SO2 absorption processes with internal circulation, the predictions based the SPSM are very close to those of the TPSM, revealing that the SPSM is a proper method to evaluate the mass transport phenomena for SO2 uptake by an aerosol droplet. When chemical reactions in the course of absorption are taken into account using the SPSM, it is noteworthy that the transient absorption process is almost independent of the Reynolds number. This arises from that fact that the entire mass transfer process is controlled by mass diffusion and dominated by the dissociation of sulfurous acid (SO2·H2O). It is also found that the chemical absorption period is elongated markedly compared to the physical absorption process, approximately by the factors of 5.6-13.1. Eventually, an analysis on the characteristic times of various transport processes is performed to elucidate mass transport mechanisms and the reasonability of the SPSM developed in this study.
Droplet and aerosol Sulfur dioxide (SO2) uptake Transient chemical absorption Reynolds number Mass diffusion number Drop mass transport number.
Ke-Miao Lu Wei-Hsin Chen Yuan-Yi Chen Chen-I Hung Wen-Jhy Lee Ta-Chang Lin
Department of Environmental Engineering,National Cheng Kung University,Tainan,Taiwan,ROC,701 Department of Greenergy,National University of Tainan,Tainan,Taiwan,ROC,700 Department of Mechanical Engineering,National Cheng Kung University,Tainan,Taiwan,ROC,701
国际会议
西安
英文
994-1000
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）