# fluid dynamics

## Reynolds number & its formula, significance & sample numerical problem

The Reynolds number, Re is a dimensionless quantity and there is a ‘rule of thumb’ for flow in a pipe using the Reynolds number Re. When Re is less than 1000, flow can be taken to be laminar; when Re is greater than 2000, the flow will be turbulent. Reynolds number of a fluid flow […]

## Bernoulli’s Equation with derivation, explanation & examples

Bernoulli’s equation describes the relationship between pressure and velocity in fluids quantitatively. Hence, this equation is named after its discoverer, the Swiss scientist Daniel Bernoulli (1700–1782). Bernoulli’s equation states that for an incompressible, frictionless fluid, the following sum is constant: P+(1/2)ρv2+ρgh=constant, where P is the absolute pressure, ρ is the fluid density, v is the […]

## What Is Bernoulli’s Principle? Explain it with airplane wing and sails example

Bernoulli’s principle is named for Daniel Bernoulli, who presented it in 1738, and it concerns the relationship between pressure and flow speed in fluids. In its simplest form, Bernoulli’s principle states that increasing flow speed in fluids corresponds to decreasing pressure, and vice versa. Application of Bernoulli’s Principle – Airplane wings and Sails Airplane wings […]

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