Fluid flow – Coanda, Bernoulli and Magnus effects

The three fluid flow video lessons are:

The Coanda Effect describes the tendency of a jet of fluid to cling to a nearby surface. Replicated on the video is a first demonstration from 1800 using a jet of air onto water and observing the dimple on the surface move underneath a curved jar brought close to the jet.

The effect has a variety of important applications for example in aircraft wing lift, in distribution of air in heating and air conditioning systems and understanding wind patterns around buildings.

Often misapplied, The Bernoulli Effect is the change in pressure shown when an isolated stream of fluid changes speed, usually by passing through a restriction, such as a narrowing pipe.

Several common classroom demonstrations are often incorrectly explained using Bernoulli's principle but there are a number of important applications of Bernoulli and the closely associated Venturi effects, explained here.

The Magnus effect is the commonly observed effect in which a spinning ball or cylinder (as in the short video on the index page) curves away from its expected flight path. It is important in many sports such as tennis, table tennis, baseball, cricket and football. It affects fast moving spinning balls. It has some engineering uses in ballistics and ship stabilisation.

There are notes on fluid flow here.

The Coanda effect - how a wing works

The Bernoulli effect

The Magnus effect - a curved ball explained