Originally the preventer was linked to the Deepwater Horizon by a mile long vertical pipe called a riser, through which oil would flow.
最初，防喷器与深水地平线平台由一根一英里长的垂直管相连，这根管子叫做立管，石油既由此通过。
2
The present paper discuses, with the method of matched asymptotic expansions, the stress boundary layer of the slender riser in a steady flow.
本文用匹配方法讨论定常流中细长立管所产生的应力边界层现象。
3
Mathematical models for Fluid Catalytic Cracking (FCC) riser reactors were built generally on the basis of assumption of "plug flow" pattern within risers.