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Dirt Devil is a brand name originally introduced (or debuted) in 1981 by the Royal Appliance Manufacturing Co, an American vacuum cleaner and floor care company. The company and the brand are now owned by TTI Floor Care North America, a subsidiary of Hong Kong–based Techtronic Industries, who also own Oreck, Vax, and Hoover North America.
By 1965, the firm was also the exclusive wholesaler for RCA products in Louisiana. His 8 pounds (3.6 kg) appliance was a third the weight of other machines available. Competitors used this to criticize Oreck's vacuum cleaner's effectiveness and durability. Oreck decided to first market to hotels where light weight would be a selling point. [6 ...
A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets, hard floors, and other surfaces. The dirt is collected into a dust bag or a plastic bin.
The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid, the strength of the vacuum produced is limited by the vapor pressure of the liquid (for water, 3.2 kPa or 0.46 psi or 32 mbar at 25 °C or 77 °F). If a gas ...
Figure 1: A de Laval nozzle, showing approximate flow velocity increasing from green to red in the direction of flow Density flow in a nozzle. A rocket engine nozzle is a propelling nozzle (usually of the de Laval type) used in a rocket engine to expand and accelerate combustion products to high supersonic velocities.
A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube which is pinched in the middle, with a rapid convergence and gradual divergence. It is used to accelerate a compressible fluid to supersonic speeds in the axial (thrust) direction, by converting the thermal energy of the flow into kinetic energy .