This document discusses different types of fluid flow in pipes. There are three main types: laminar flow, where fluid particles move in parallel layers without mixing; turbulent flow, where the fluid movement is irregular and random; and transitional flow, which is a mixture of laminar and turbulent. The Reynolds number determines whether flow is laminar or turbulent, with laminar flow below a Reynolds number of 2300 and turbulent above 4000. The document also defines the entrance region and entrance length as the area and distance where fluid flow develops after entering a pipe.

2. Topic:
Flow in Pipes
Presented By-
Md. Shahadot Hossain
Roll: 150802
Session: 2015-2016
Dept. of Petroleum and Mining
Engineering

3. Types of Fluid Flow
Generally three different types of fluid flow are-
1.Laminar flow
2.Turbulent flow
3.Transitional flow

4. Laminar Flow
In this type of flow,
Fluid particles moves along smooth
straight parallel paths in layers or laminas,
With one-layer gliding smoothly over an
adjacent layer,
The paths of individual fluid particles do
not cross those of neighboring particles

5. Turbulent flow
In turbulent flow,
there is an irregular random movement
of fluid in transverse direction to the
main flow.
the speed of the fluid at a point is
continuously undergoing changes in
both magnitude and direction.

6. Transitional flow
Transitional flow is a mixture of
laminar and turbulent flow,
Turbulence in the center of the
pipe, and laminar flow near the
edges.

7. Reynolds Number (Re)
The Reynolds number (re) is an important dimensionless
quantity in fluid mechanics
Used to help predict flow patterns in different fluid flow
situations.
Turbulent or laminar flow is determined by the
dimensionless Reynolds number.

8. Reynolds Number (Re)
Types of flow depend on the Reynold number ,
Re < 2300 – flow is laminar
Re > 4000 – flow is turbulent
2300 < Re < 4000 – flow changes from laminar to turbulent.

9. Entrance Region
The hydrodynamic entrance region
refers to the area of a pipe where
fluid entering a pipe

10. Entrance Length
In fluid dynamics,
The entrance length is the
distance a flow travels after
entering a pipe before the flow
becomes fully developed.
Entrance length refers to the
length of the entry region,

11. Thanks to All