1) Mathematics: unsteady flux
2) Metallurgy: time-dependent flow, transient flow
3) Oil: unsteady flow
4) Theory of mass service: nonstationary stream
5) Metrology: unsteady-state flow
6) Oil&Gas technology nonstationary flow
7) Oilfield: unsteady state flow
8) Makarov: nonstationary current
9) General subject: nonsteady stream
Универсальный русско-английский словарь. Академик.ру. 2011.