path line
path line — 名詞
1. the curved track that one small bit of a moving liquid or gas follows over a per
跡線；軌跡線
單一流體粒子隨時間移動所走的路徑
the curved track that one small bit of a moving liquid or gas follows over a period of time, used by scientists to picture how the flow moves.
Faisal dropped blue dye into the river to reveal the path line of the current.
Faisal 把藍色染料滴進河裡，讓水流的跡線清楚顯現出來。
the path line of [moving fluid]
The wind-tunnel camera traced the path line of a single smoke particle past the wing.
風洞攝影機追蹤了單一煙霧粒子掠過機翼的跡線。
traced the path line of [a particle]
Each path line in the simulation curled tightly behind the spinning propeller.
模擬中每一條跡線都在旋轉的螺旋槳後方緊緊捲起。
Engineers studied every path line to see where hot gas pooled near the engine.
工程師研究每一條跡線，看看熱氣在引擎附近的哪裡聚積。
studied every path line to [analyse flow]
A path line shows where one drop has been, not where the stream points now.
跡線顯示的是一滴液體曾經走過哪裡，而不是水流現在指向何方。
contrast: path line vs instantaneous flow
- trace a path line
- the path line of a particle
- path line in the simulation
- pathline
the same term written as one word; common in engineering papers
- particle path
plainer wording for the route a single particle takes
文法句型
the path line of [something moving]
用法筆記
Distinguish from a streamline: a path line records where one particle has actually travelled over time, while a streamline shows the flow direction everywhere at a single instant.