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- W4249218581 abstract "This paper reports a new type of flapping turbulent jets that are self-excited by flutter of a flexible film with a leading edge fixed axially and centrally at a round nozzle exit. Both flutter conditions of a film and flapping-jet characteristics are investigated by varying the film material and dimensions of length (L), span (S) and thickness (δ). Visual observation, flow visualization and hot-wire anemometry are used to examine the flapping jet versus the free counterpart without involving any film. Experiments are made at L/D = 0.5 ∼ 2.0 and the jet Reynolds number of Re = 10,000 to 50,000; where Re ≡ UoD/ν with D, Uo and ν being the jet-exit diameter, exit-averaging velocity and fluid viscosity, respectively.Results show that the film’s flutter domain reduces with increasing its overall stiffness and varies with the film’s shape, size and thickness. The jet-flapping frequency fF rises as either L decreases or Uo increases. For the rectangular FEP film of L/D = 0.5 ∼ 2.0, the jet-flapping Strouhal number StF ≡ fFD/Uo varies over the range of 0.05 ≤ StF ≤ 0.23. This StF is noticeably lower than that (≈ 0.5 ∼ 0.7) of the primary vortex passage in the non-flapping free jet, but extraordinarily one to two orders of magnitude higher than those for the self-excited oscillation of a jet from conventional fluidic nozzles." @default.
- W4249218581 created "2022-05-12" @default.
- W4249218581 date "2019-06-01" @default.
- W4249218581 modified "2023-09-27" @default.
- W4249218581 title "Contributors" @default.
- W4249218581 doi "https://doi.org/10.1016/s0889-8588(19)30046-2" @default.
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