an annular tube 圆环形管道
Annular-tube boiler 套管锅炉
narrow gap annular tube 窄缝环形管
narrow-gap annular tube 窄缝环形管
annular finned tube 环形内肋
Magnetic Annular Shock Tube 磁性环形激波管
Set up was a momentum analysis model of the drift velocity in stagnant liquid of long bubbles in an annular tube.
建立圆管内滞止液体中长气泡漂移速度动量分析模型。
The flow over a backward facing step of an annular tube is a very important part of air drilling, determining the detritus going back to the ground successfully.
环空管道后台阶突扩流动是空气正循环钻井过程中十分重要的关键部分，直接决定了钻探岩屑是否能够顺利上返地面。
Through a theoretical analysis a study has been carried out concerning the evaporation heat exchange characteristics of water-air annular two-phase flows in a vertical slender tube.
通过理论分析，研究了竖直细小管内水—空气环状两相流的蒸发换热特性。
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