同时考虑可逆与不可逆吸收的雨水酸化和冲刷的数值实验

THE NUMERICAL EXPERIMENTS OF ACIDIFICATION OF RAIN AND WASHOUT OF GASES INVOLVING BOTH REVERSIBLE AND IRREVERSIBLE ABSORPTIONS

中文摘要:

      云中清除(rainout)和雨水清除(washout)是两种重要的污染物冲刷机制。在这两种过程中,气体与液态水的作用方式不同。对云中清除,云滴跟随气流,一般假定气一液可达到吸收平衡^[1]。对雨水清除,因雨滴下落时,不跟随气流,对溶解度很大的气体.难以达到吸收平衡。Hales提出用两种方法来处理^[2]。即对可溶性小,传质由化学控制的气体,能与液态水达到平衡,用可逆吸收来处理,反之用不可逆吸收来处理。大气中气体种类繁多,且雨水清除相对比较重要^[3],吸收方式的处理对研究云雨酸化和大气污染物的清除具有一定的意义。

英文摘要:

      The effects of both reversible and irreversible absorptions on the acidification of rain and washout of gases are studied with a one-dimensional model. The results show that the reversible washout is related to chemical reactions,while the irreversible washout is associated only with physical processes. In addtion,the temporal changes of rain pH and oxidation rates of S (Ⅳ) are also studied in the experiments.