# Streamline Flow

• If the motion of parallel layers is an orderly fashion and maintains uniform velocity gradient , it is called streamline flow or Laminar flow.
• The path followed by a fluid particle is called streamline.
• The velocity at a point in a fluid remains constant both in magnitude and direction.
• No two streamlines intersect because at the point of intersection two direction for a particle which is impossible.
• The tangent drawn to the streamline gives the direction of velocity.
• According to the equation of continuity the mass of the liquid entering the tube at one end is equal to the mass leaving at other end.
• The product of area of cross section of tube and velocity of flow at that point is constant. A1V1=A2V2
• If the motion of parallel layers of fluid is in disorder and maintain different velocity at the same point the flow is called turbulent flow.
• Reynold number is a pure number which decides the flow is streamline or turbulent.
• Critical velocity is the velocity at which stream line flow charges to turbulent flow.
• Reynold number depends upon the diameter of pipe.
• 0 < R < 1000 the flow is said to be streamline
R > 2000 the flow becomes turbulent.
• Density of a liquid to density of water called Relative density.

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