Basic Concepts of Fluid Statics
Definition of Fluid Statics.
What is Fluid Statics?
Define Fluid Statics.
Describe Fluid Statics.
- Fluid Statics is the branch of Fluid Mechanics that studies the fluids at rest and the pressure in a fluid or exerted by a fluid on an immersed body.
- It is also called Hydrostatics.
The Pressure of a Fluid
Definition of the Pressure of a Fluid.
What is the Pressure of a Fluid?
Describe the Pressure of a Fluid.
Define the Pressure of a Fluid.
- When a fluid is contained in a vessel, it exerts a force on the sides and bottom of the vessel due to its weight.
- The direction of pressure is always at a right angle to the surface.
- It is generally denoted by P.
- Its SI unit is Newton (N).
Intensity of Pressure
Definition of Intensity of Pressure.
Define the Intensity of Pressure.
What is the Intensity of Pressure?
Describe the Intensity of Pressure.
- The pressure exerted by the liquid per unit area is called the Intensity of Pressure.
- It is also known as Unit pressure or Specific pressure.
- It is denoted by p.
- p= P/A
- where p = Intensity of Pressure
- P = Pressure acting on a surface
- A = area of the surface on which the pressure is acting
- The SI unit of Intensity of Pressure is N/m2.
- Generally, the Intensity of Pressure is referred to as Pressure.
Pressure Head of a Liquid
Derive the expression for Pressure Head of a Liquid.
What is the Pressure Head of a Liquid?
Derive the formula for the Pressure Head of a Liquid.
- Suppose a tank of base area A filled with liquid up to height h.
- P = Specific weight of liquid * Volume of liquid
- P = wAh
- The intensity of pressure (p) is:-
- p = P/A
- p = wAh/A
- p = wh
- Since, p = wh. This shows that the intensity of pressure varies with the depth of liquid since the specific weight of the liquid is constant.
- When the pressure is expressed in terms of the height of the liquid, then, that height of the liquid is referred to as the pressure head.
- Pressure head (h) = p/w
- It is generally measured in mm or cm or m of the liquid column.