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Is there any good approach to determining if an amount of air passing through a given slit or gap will cause a whistling sound? I'm unsure with what shapes whistling might become an issue, and also at what air velocities.
Airflow causes whistling because when air moves through a narrow opening, it creates vibrations. These vibrations then produce sound waves, which we perceive as whistling.
The size and shape of the opening, the speed and direction of the airflow, and the density and viscosity of the air are all factors that can influence when an airflow will cause whistling.
Yes, whistling can be prevented by adjusting the factors that influence it. For example, widening the opening or reducing the speed of the airflow can prevent whistling.
Whistling from airflow can be used in applications such as musical instruments, aerodynamic testing, and industrial processes. It can also be used as a warning signal, such as in the case of a tea kettle or a pressure relief valve.
No, whistling from airflow is not always considered a problem. In some cases, it can be intentionally designed for a specific purpose, as mentioned in the previous answer. However, in other cases, it can be a nuisance or indicate issues with the airflow system, such as leaks or obstructions.