Privacy Policy Login General Information: informationwhoi.edu or (508) 548-1400 Website inquiries: webdevwhoi.edu Media inquiries: mediawhoi.edu.Mathematically the velocity components can be written as u f ( x, y, z, t ) v f ( x, y, z, t ) w f ( x, y, z, t ) Let V is resultant velocity at any point in a fluid flow.Register Mechanical Engg GATE GATE 2021 GATE ME GATE Syllabus GATE Notes GATE Question Paper SSC JE ME SSC JE Mechanical SSC JE ME Syllabus SSC JE Papers SSC JE ME Papers IES Exam ESE Mechanical 2020 ESE 2020 Notification Quick Links GNST for ME 2020 Exams All ME Exams NLC GET Syllabus NLC India Recruitment NIELIT Recruitment PSU through GATE Jobs without GATE CIL Recruitment DRDO Scientist B Syllabus Video Course Mechanical Engg Online Coaching GATEESE Online Coaching GATE ME Online Coaching Mock Test ME Test Series SSC JE Test Series GATE ME Mock Test GATE Test Series Home Mechanical Engg.Types of Fluid Flows Fluid flow may be classified under the following headings; Steady Unsteady Flow Steady Flow At a fixed position, if fluid properties and flow parameters do not change with time then it is a steady flow.
Unsteady flow If fluid properties and flow parameters changes with time as a fixed position then it is called unsteady flow. For the Unsteady flow: Uniform Non-uniform Flow The flow is defined as uniform flow when in the flow field the velocity and other hydrodynamic parameters do not change from point to point at any instant of time. For Uniform Flow While a flow in which the velocity and other hydrodynamic parameters changes from one point to another the flow is defined as non-uniform. For Non uniform flow Laminar Turbulent Flow Laminar flow is type of flow in which the fluid particles move along well-defined paths or steam line all the streamlines are straight parallel. Thus, the particles move in layers gliding smoothly over the adjacent layer. Whereas in Turbulent flow, the fluid particles move in a zig zag way which results in eddies formation which are responsible for the energy loss. Compressible flow Incompressible flow Compressible flow is a type of flow in which density of the fluid changes from point to point. One-dimensional (1- D), Two-dimensional (2-D) and Three-dimensional (3-D) flows: 1-D is a type of flow in which flow parameter such as velocity is a function of time one space co ordinate only. D is a type of flow in which flow parameter such as velocity is a function of time three space coordinate only. Combining these, the most common flow types are: Steady uniform flow Conditions do not change with position in the stream or with time. E.g. flow of water in a pipe of constant diameter at a constant velocity. Steady non-uniform flow Conditions change from point to point in the stream but do not change with time. E.g. Flow in a tapering pipe with constant velocity at the inlet. Unsteady uniform flow At a given instant in time the conditions at every point are the same but will change with time. E.g. A pipe of constant diameter connected to a pump pumping at a constant rate which is then switched off. Unsteady non-uniform flow Every condition of the flow may change from point to point and with time at every point. E.g. Waves in a channel Flow Pattern Three types of fluid element trajectories are defined: Stream lines, Path lines, and Streak lines. Stream lines A streamline at any instant can be defined as an imaginary curve or line in the flow field so that the tangent to the curve at any point represents the direction of the instantaneous velocity at that point. Only for steady flow, streamlines remain same at all instants of time. Path lines - A path line is the actual path travelled by an individual fluid particle over some time period. An example of a path line is the trajectory taken by one puff of smoke which is carried by the steady or unsteady wind. Streak-line: A streak line is the locus of fluid particles that have passed sequentially through a prescribed point in the flow. Timeline: A timeline is a set of adjacent fluid particles that were marked at the same (earlier) instant in time. In a steady flow, streamlines, pathlines, and streaklines all coincide. Velocity of Fluid Particle Velocity of a fluid along any direction can be defined as the rate of change of displacement of the fluid along that direction Let V be the resultant velocity of a fluid along any direction and u, v and w be the velocity components in x, y and z directions respectively.
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