当气体流量突然降低时，在段塞流的瞬态变化过程中则会出现短时间的分层流。
When gas flow rate quickly decreases, there will appear a short period of stratified flow in the transient process of the slug flow.
如果是受到机械式的搅拌或者是密度梯度发生了变化而使得管中有大量的分层的气体，那么传递就主要通过强制对流或自然对流而发生。
If there is a bulk mixing of the layers of gas in the tube by mechanical stirring or because of a density gradient, mass transfer occurs primarily by the mechanism of forced or natural convection.
以锌空气电池气体扩散电极为研究对象，采用分层添加催化剂的方式研究了改变催化层位置对气体扩散电极放电性能的影响。
Take gas diffusion electrode of zinc-air battery for example and add catalyst by layers, we studied the effect of changing catalyst layer location on the performance of gas diffusion electrode.
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