Perforated-plate turbulence: Orifice versus converging nozzle
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
The classical grid turbulence is revisited in an effort to better understand the role of the finite-thickness flow passage of the turbulence generator. The virtually zero-thickness orificed perforated plate (OPP) is contrasted with its reversed counterpart, the converging-nozzled perforated plate (CNPP). The respective turbulent flows are detailed via a triple-wire of a constant-temperature hot wire anemometer. The two flows are compared in terms of the spatial evolution of the essential turbulence characteristics, including the various turbulence intensities and length scales. As expected, a higher level of turbulence resulted from the sharp edges of the OPP. Surprisingly, the finite-thickness converging passages of the CNPP caused the other turbulence parameters to behave rather perplexingly.
Yang, Yang; Ting, David S.K.; and Ray, Steve. (2018). Perforated-plate turbulence: Orifice versus converging nozzle. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 1.