two-directional flow 二向流动 ; 二向流
Proportional Directional-flow valve 比例方向阀
down-hole bi-directional flow valves 井下流体双向流动阀
bi-directional power flow 双向功率流动
bi-directional pedestrian flow 对向行人流
flow directional detection 流向测量
high flow directional control valve 大流量换向阀
dynamic directional gradient vector flow 动态方向梯度矢量流
⑦From the experimental results analysis,the heat transfer coefficient have been the directional flow little impact. And the heat transfer quantity is decreased.
⑦由实验结果分析得到,传热系数受定向流动的影响不大。
参考来源 - 循环流化床锅炉外置式换热器热态实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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