Coanda effect


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Coanda effect

a phenomenon of fluid movement similar to the Bernoulli effect in which passage of a stream of gas next to a wall results in a pocket of turbulence between the wall and the gas flow. The turbulence forms a low-pressure bubble that makes the gas stream adhere to the wall. The principle is used in fluidic ventilators.

Coanda,

Henri-Marie, Romanian aerodynamicist, 1885-1972.
Coanda effect - a stream of air or fluid emerging from a nozzle follows a nearby curved surface if the angle of curve is not too sharp.
References in periodicals archive ?
The NOTAR system is based on using the Coanda effect and vectored thrust to create the force necessary to counteract the torque effect and control the helicopter around the vertical axis.
Experimental and numerical POD study of the Coanda effect used to reduce self-sustained tones.
The luminaire has also been tested to confirm that the suspended element will not interfere with the air-conditioning flow and, therefore, avoids the Coanda effect.
Vlachopoulos has demonstrated the source and understanding of V-shapes in injection molded parts, has developed mathematical models of the polymer sintering process occurring in rotational molding, and has recently developed an analysis of the role of the Coanda effect on the aerodynamics of blown film cooling as practiced in a large segment of the blown film ind ustry.
The jet, once formed, can be controlled by the Coanda effect using an obstacle in the flow that is designed to optimize the performance of the meter.
The model will be used to predict the capacity of Coanda effect screens and hence to choose appropriate screen sizes to achieve desired flow conditions.
It is explained that the large influence observed on heat transfer rates is primarily due to the Coanda effect, which forces air jets to attach themselves to surfaces.
The hot air jet exiting the grille attaches to the floor via the Coanda effect, forming a "wall jet" across the field of view.
During these experiments, it was observed that the incoming air (jet flow) attached to the ceiling after entering the room because of the Coanda effect (Zhang 1991).
The achieving of the rotation is made through Coanda Effect.
Due to the coanda effect the supply air sticks to the ceiling and then goes down along the sidewalls.
The experimental results show that for some particular geometrical configuration, where the Coanda effect takes place the values of the hydrodynamic forces, the Reynolds critical number, the flow coefficient and the cavitation present some anomalies.