Can someone explain about bernoull's principle

Question

Can someone explain about bernoull's principle

Answer 1

It is the good ole Conservation of Energy concept.  If you do NOT add any energy to a moving mass of fluid (liquid or gas) but make it speed up, something has to give. The increase of speed means that the kinetic energy has increased (KE = 0.5MV^2), but total energy must remain constant.  There MUST be a loss of energy some where to balance the KE increase.  That loss shows up as a decrease in pressure or a decrease in height or both.

Bernoulli has a term for each: Kinetic, elevation, pressure the sum of all three = a constant.  Change one and the others change to balance the change.

Answer 2

In fluid dynamics, Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's gravitational potential energy.[1] Bernoulli's principle is named after the inventor Daniel Bernoulli.

Bernoulli's principle can be applied to various types of fluid flow, resulting in what is loosely denoted as Bernoulli's equation. But in fact there are different forms of the Bernoulli equation for different types of flow. The simple form of Bernoulli's principle is valid for incompressible flows (e.g. most liquid flows) and also for compressible flows (e.g. gases) moving at low Mach numbers. More advanced forms may in some cases be applied to compressible flows at higher Mach numbers (see the derivations of the Bernoulli equation).

Bernoulli's principle is equivalent to the principle of conservation of energy. This states that in a steady flow the sum of all forms of mechanical energy in a fluid along a streamline is the same at all points on that streamline. This requires that the sum of kinetic energy and potential energy remain constant. If the fluid is flowing out of a reservoir the sum of all forms of energy is the same on all streamlines because in a reservoir the energy per unit mass (the sum of pressure and gravitational potential ρgh) is the same everywhere. [2]

Fluid particles are subject only to pressure and their own weight. If a fluid is flowing horizontally and along a section of a streamline, where the speed increases it can only be because the fluid on that section has moved from a region of higher pressure to a region of lower pressure; and if its speed decreases, it can only be because it has moved from a region of lower pressure to a region of higher pressure. Consequently, within a fluid flowing horizontally, the highest speed occurs where the pressure is lowest, and the lowest speed occurs where the pressure is highest.