Vacuum Cleaner Presented by: Vinit Patel Alex Valdez
Major Physics behind the vacuum cleaner • Bernoulli Effect • Venturi Effect
Definitions • Vacuum - A space in which the pressure is significantly lower than atmospheric pressure. • Air Pressure - Pressure exerted by the weight of air on an object in that air.
What Happens • The fan decreases the pressure inside the hose of the vacuum, so air accelerates toward the inlet. • It also changes the potential energy of the air to kinetic energy.
The Physics • Bernoulli’s Principle – States that in fluid flow, an increase in velocity occurs simultaneously with decrease in pressure.
The Physics • Venturi Effect – it’s a special case of Bernoulli’s principle, in the case of air flow through a tube or pipe with a constriction in it. The air must speed up in the restriction, reducing its pressure and producing a partial vacuum via the Bernoulli effect.
Demonstrations • http://home.earthlink.net/~mmc1919/venturi.html • Paper • Water
Sources • home.earthlink.net/~mmc1919/venturi.html • howthingswork.virginia.edu/ supplements/vacuum_cleaners.pdf • en.wikipedia.org/wiki/Venturi_effect • en.wikipedia.org/wiki/Bernoulli's_principle