... density gradient sedimentation 密度梯度沉降法 density gradient tube 密度梯度管 concentration gradient 浓度梯度 ...
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gradient tube density determination 梯度管密度测定
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.
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。
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