科研之友
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摘要
We have experimentally studied subsonic submerged air jets emitted from flat mini and micro nozzles with characteristic dimensions from 22 to 600 mu m in a range of Reynolds numbers 70-2600. The point of laminar-turbulent transition (jet penetration range) was determined using the flow visualization technique. It is established that the penetration range of micro jets can reach 100-300 nozzle calibers. The Reynolds number for the transition to turbulence in flat mini and micro jets reaches high values (1000-2600), which are two to three orders of magnitude greater than the Reynolds numbers for the loss of stability (3-10). Available experimental data are summarized and generalized based on the Reynolds number determined for the jet penetration range.
- 出版日期2015-1
