![]() ![]() The air pressure in the gap between the door and the frame drops. The door gap is a constricted cross-section through which the air flows very quickly. The slamming of doors due to a draft, is also due to the Venturi effect. The streamline density is a measure of the velocity of the flow! Figure: Venturi effect for generating lift on aircraft wings Slamming of doors by a draft That the air above the airfoil flows faster than below can be seen graphically by the fact that the streamlines above the wing are closer together. This principle ultimately produces lift at airfoils, because air upside of the wing flows faster than the air below. Figure: Demonstration of the Venturi effect on a sheet of paper Animation: Demonstration of the Venturi effect on a sheet of paper Due to the fast flowing air on the top side of the sheet, the pressure decreases and the higher pressure on the bottom side (resting air) pushes the sheet of paper upwards. ![]() The paper sheet is not pushed down, but lifted up. Now blow with your mouth over the top of the sheet. To do this, hold a sheet of paper at the corners with two fingers and bring it to the lower lip. The decrease in pressure in flowing fluids can be verified relatively easily with a sheet of paper. ![]() The present article therefore deals with examples and technical applications of the Venturi effect. In the article Venturi effect, this phenomenon have already been discussed in detail. The Venturi effect ( Bernoulli effect) refers to the decrease in pressure in flowing gases or liquids with increasing flow velocity. ![]()
0 Comments
Leave a Reply. |