Acoustic Study and Behavior of Flow through orifices

Orifice is designed either to decrease pressure or to increase velocity of fluid flow. When pressurized turbulent flow or normal fluid flow flows through an orifice, it creates sound waves, disturbances, pressure fluctuations leads to vibrations, generation of noise and cavitation at orifices. So to prevent such things, there is need to study the acoustic behind such flows, to analyze the frequency spectrum, power spectra, acoustics wave transmission for flow through orifice. For such acoustic study, different literatures have been studied and presented in this research paper. Different types of flows are analyzed through different shapes of orifices by depicting sound power spectra, frequency spectra etc. Some experimental results have presented for one-phase and two-phase high pressurized flow through single-hole and multi-hole thick orifices. The most of studies over acoustic wave behaviour in flow through sharp edge orifices placed in circular, square and rectangular duct have been presented. The research was carried out presented on the acoustic source created by turbulent flow through orifices and large eddy simulation of acoustical flow through an orifice. The entrainment of cavitation and sound waves into the fluid flow through an orifice is also presented. Flow acoustic study can be applied various industries and fields where acoustic study counts to overcome problems, to determine effects of sound waves on orifices, to determine behaviour of flow through different shapes of orifice and to analyze the effects of entrainment of sound waves into the fluid flow on power and frequency spectrum.