Generally, flow at highvelocity around well bore in gas well is belong to non-Darcian flow which arising adding pressure drop.
通常情况下，气井井轴周围的高速流动为非达西流动，产生附加压降。
2
The smelting process was strengthened by using high top pressure, high pressure drop, large blowing rate, reduced tuyere section and enhanced blasting velocity.
采取高顶压、高压差、大风量、缩小风口直径、提高风速和鼓风动能等措施进一步强化冶炼；
3
The sea level stops in a high position for a long time, so both drop of water and current velocity are small.