Flow patterns and types of flow

includes flow patterns and types of flow basics

1. SNPIT &RC PRESENTATION ON: Flow pattern and Types of flow MADE BY: Civil-B (3 rd SEM) SUBJECT : Fluid Mechanics(2130602) GUIDED BY: Sarika Javiya Mam Bankim Joshi Sir

2. CREW MEMBERS PEN NO. 1.Kathan Sindhvad = 160490106087 2.Vishal Sharma = 160490106085 3.Malhar Shukla = 160490106086 4.Upadhyay Nishank = 160490106092

3. Flow Patterns Streamlines are a family of curves that are instantaneously tangent to the velocity vector of the flow. These show the direction in which a massless fluid element will travel at any point in time. Streaklines are the loci of points of all the fluid particles that have passed continuously through a particular spatial point in the past. Dye steadily injected into the fluid at a fixed point extends along a streakline . Pathlines are the trajectories that individual fluid particles follow. These can be thought of as "recording" the path of a fluid element in the flow over a certain period. The direction the path takes will be determined by the streamlines of the fluid at each moment in time .

4. Streamtube is a tubular region of fluid surrounded by streamlines. Since streamlines don't intersect, the same streamlines pass through a streamtube at all points along its length Timelines are the lines formed by a set of fluid particles that were marked at a previous instant in time, creating a line or a curve that is displaced in time as the particles move.

5. Types of flows ‘ Steady flow’ defined as that in which the various parameters at any point do not change with time. Flow in which changes with time do occur is termed ‘ Unsteady’ or ‘ Non-steady’ .

6. 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. When the velocity and other hydrodynamic parameters changes from one point to another the flow is defined as ‘ non-uniform flow’.

7. ‘Laminar flow’ is a fluid flow in which the fluid layers move parallel to each other and do not cross each other. Turbulent flow is a fluid flow in which the fluid layers cross each other and do not move parallel to each other.

8. When the volume and therby density of fluid changes aprreciablydruing flow,the flow is said to be ‘ Compressible flow’. If the volume and therby the density of fluid changes insignificantly in the flow field is said to be ‘ Incompressible flow’.

9. Fluid flow in which all flow is parallel to some straight line, and characteristics of flow do not change in moving perpendicular to this line is ‘ One dimensional flow’ or ‘ 1-D flow’ . Fluid motion can be said to be a ‘ Two-dimensional flow’ or ‘ 2-D flow’ when the flow velocity at every point is parallel to a fixed plane. The velocity at any point on a given normal to that fixed plane should be constant.

10. ‘Three dimensional flow’ is that type of flow in which flow parameters vary in all three directions. 1-D flow 2-D flow 3-D flow

11. If the angle between the two intersecting lines of the boundary of the fluid element changes while moving in the flow, then the flow is a ‘ Rotational Flow’ . If the fluid element rotates as a whole and there is no change in angles between the boundary lines then the flow cannot be Rotational Flow, so it is ‘ Irrotational Flow’ .