Colored streamlines - Colored streamlines

…In a flow that varies over time, the images captured by instantaneous exposure and continuous exposure are different; the former gives streamlines, while the latter gives the flow path, which is the envelope of the streamlines at each instant. Also, the streaks seen by soot from smoke coming out of a chimney or dye poured into water are connections of fluid particles that emerge one after another from a specific point, and are called colored streamlines or streaks. As the definitions suggest, streamlines, flow paths, and colored streamlines are all separate entities, but in a steady flow they all coincide. …

*Some of the terminology explanations that mention "colored streamlines" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…時間的に変動する流れでは瞬間露出と継続露出とで撮影の映像が異なり，前者は流線，後者は各瞬間での流線の包絡線である流れの道筋を与える。また煙突から出る煙のすすや水に流した色素が見せる筋模様は，特定の点から次々に出てくる流体粒子をつないだもので，色つき流線とか流脈と呼ばれる。流線，流れの道筋，色つき流線は定義からもわかるように別々のものだが，定常な流れでは全部が一致する。…

※「色つき流線」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報