two dimensions flow with example
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Answer:
Line/point source Edit
A line source is a line from which fluid appears and flows away on planes perpendicular to the line. When we consider 2-D flows on the perpendicular plane, a line source appears as a point source. By symmetry, we can assume that the fluid flows radially outward from the source. The strength of a source can be given by the volume flow rate {\displaystyle Q}Q that it generates.
Fig 1 – Streamlines of flow generated by line source coincident with {\displaystyle Z}Z-axis
Line/point sink Edit
Similar to a line source, a line sink is a line which absorbs fluid flowing towards it, from planes perpendicular to it. When we consider 2-D flows on the perpendicular plane, it appears as a point sink. By symmetry, we assume the fluid flows radially inwards towards the source. The strength of a sink is given by the volume flow rate {\displaystyle Q}Q of the fluid it absorbs.
Example: the flow in a pipe is considered one-dimensional when variations of pressure and velocity occur along the length of the pipe, but any variation over cross-section is assumed negligible.