# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

Homepage

<< < acc geo sub > >>

Number of Results: 48 Search : flow
 subsonic flow   تچان ِ زیر-صدایی   tacân-e zir-sedâyiFr.: écoulement subsonique   A flow in which the velocity of the constituting particles never exceeds that of sound in the same fluid. Also called subcritical flow.→ subsonic; → flow. Taylor-Couette flow   تچان ِ تیلر-کویءت   tacân-e Taylor-CouetteFr.: écoulement de Taylor-Couette   The → Couette flow between two concentric cylinders with fluid filling the annular region. The flow is generated by the relative rotation of the two cylinders. Under some physical conditions the flow may undergo the → Taylor-Couette instability.→ Taylor number; → flow. three-dimensional flow   تچان ِ سه-وامونی   tacân-e sé-vâmuniFr.: écoulement tri-dimensionnel   A flow whose parameters (velocity, pressure, and so on) vary in all three coordinate directions. Considerable simplification in analysis may often be achieved, however, by selecting the coordinate directions so that appreciable variation of the parameters occurs in only two directions, or even only one (B. Massey, Mechanics of Fluids, Taylor & Francis, 2006).→ three; → dimensional; → flow. transitional flow   تچان ِ گذرشی   tacan-e gozarešiFr.: flux de transition   In fluid mechanics, a flow composed of → laminar and → turbulent flows, for which the → Reynolds number is between 2300 and 4000.→ transition; → flow. transonic flow   تچان ِ تراصدایی   tacân-e tarâsedâyiFr.: écoulement transsonique   Flow of a fluid over a body with a speed in the range just above and below the → Mach number 1.→ transonic; → flow. tube of flow   لوله‌ی ِ تچان   lule-ye tacânFr.: tube d'écoulement   Same as → flow tube.→ tube; → tube. turbulent flow   تچان ِ آشوبناک   tacân-e âšybnâkFr.: écoulement turbulent   A → flow characterized by → turbulence. In other words, a flow in which the motion at any point varies unpredictably in direction and magnitude. See also → laminar flow; → transitional flow.→ turbulent; → flow. two-dimensional flow   تچان ِ دو-وامونی   tacân-e do-vâmuniFr.: écoulement bi-dimensionnel   A flow whose parameters are functions of time and two space coordinates (x and y) only. There is no variation in the z direction and therefore the same → streamline pattern could at any instant be found in all planes in the fluid perpendicular to the z direction (B. Massey, Mechanics of Fluids, Taylor & Francis, 2006).→ two; → dimensional; → flow.

<< < acc geo sub > >>