The effects of surfaces tension and gravity drainage on heat transfer of fin flanks are considered in the theoretical model.

对翅侧的换热，既考虑到表面张力的影响，又考虑到重力的作用。

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The steam?assisted gravity drainage(SAGD) process with various types of well configurations has been successful for recovering it.

各种布井方式的蒸汽辅助重力泄油开采这类稠油已获成功。

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It took costs and pains to design and construct the outdoor gravity drainage system when complicated topography and longer pipelines were encountered.

进行室外污水重力排水设计、施工时，遇到复杂地形或管线较长时，既费成本又废心血。

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Edwards aims to use a newer method called steam-assisted gravity drainage.

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Steam Assisted Gravity Drainage (SAGD) pumps steam into the ground to liquefy the bitumen and stiff crude oil, making it thin enough to be pulled out of the ground.

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