Theme: Laminar and turbulent action of liquid Plan

Hydro and gas dynamics. Presentation.

• Prepared by: Isomiddinova Dilafruz.

Theme: Laminar and turbulent action of liquid

Plan:

• Laminar action of liquid
• Turbulent action of liquid

- Reynolds Number

In general it can be said that there are two types of flows: a laminar flow and a turbulent flow. You can see in the picture that laminar flow has been visualized by an experiment using ink in a cylindrical tube. The ink has been injected into the middle of a glass tube through which water flows. When the speed of the water is still low, the ink does not appear to mix with water, the stream lines are parallel; this is called laminar flow.
If the speed of the water increases, a sudden change will occur at a certain speed. The flow completely disrupts and the water turns homogeneous through the ink. The stream lines are chaotic, not linear anymore, which is called turbulent flow.
In the experiment, Reynolds discovered a dimensionless number could be used to classify flows as either laminar or turbulent. This number is called the Reynolds number. The Reynolds number Re is defined by the following equation:
where,
L: Characteristic length
(In this example, L is the inside diameter of the pipe)
U: Representative velocity
(Here, it is the average velocity of the flow passing through a cross-section of the pipe)
ρ : Fluid density
μ: Viscosity coefficient
Thank you for your attention.