Difference Between Stream Line, Streak Line, and Path Line
Comparison between Stream Line, Streak Line, and Path Line
- Difference Between Stream Line, Streak Line, and Path Line in Tabular Form.
|It is an imaginary line showing the positions of various fluid particles.
|It is a real line showing instantaneous positions of various particles.
|It is a real line showing the successive position of one particle.
|Particles may change streamline depending on the type of flow
|May change from instant to instant.
|Particles may cross its path line.
|Streamlines cannot intersect with each other, they are always parallel.
|Streak line changes with time. Two streak lines may intersect each other.
|Two path lines for two particles may intersect each other.
|No flow across streamline.
|Flow across the streak line is possible.
|Flow across a path line is possible by other particles.
- A stream tube is an imaginary tube consists of streamlines, forming its boundary surface, which does not permit the fluid across it.
- Stream tube may be of regular or irregular shape.
- As stream tube is bounded by streamlines, therefore no fluid can enter or leave the stream tube from its boundary. Hence stream tube behaves as a solid surface tube
- The general continuity equation can be applied to stream tubes though it has no solid boundaries.
- In steady flow with uniform velocity, all streamlines are straight and parallel.
- It is an instantaneous picture of the positions of all fluid particles in the flow which have passed or emerged from a given point.
- The line of smoke from a chimney is a streak line.
- A dye when injected into the flowing fluid and a resultant colored lines after some time gives the streak lines.
- It is the actual path traveled by an individual fluid particle over a period of time.
- The locus of the same fluid particle over a time period 𝑡1 to 𝑡2 is called a path line
- The path line may intersect at different times.
- A path line is a Langrangian concept in that we simply follow the path of an individual fluid particle as it moves around in the flow field.
- Difference between Lagrangian and Eulerian Approach
- Difference between Line Standards and End Standards