| 摘要 |
PURPOSE:To markedly increase work load by injection in a liquid as compared with a conventional method by reducing the attenuation in the energy of a jet stream, by forming a jet orifice, of which the diameter is enlarged so as to be made larger than that of the orifice part formed to a nozzle, to the downstream side of said orifice part. CONSTITUTION:In a nozzle apparatus 1 which communicates with a liquid supply means 8 and used in a liquid, a jet orifice 4 having a cross-sectional area, of which the diameter is enlarged so as to be made larger than that of the orifice part 2 for increasing the flow speed of a liquid, is formed in communication with the orifice part 2 in the downstream side thereof. The enlargement ratio of the jet orifice to the orifice part 2 is set so as to form a shape gradually enlarging at the angle thetaW of 20-60 deg. with respect to the axis of the orifice part 2 at least in the vicinity of the outlet of said orifice part. In addition, the length L of the jet orifice is set to 4-20 times the diameter dO of the orifice part 2. That is, the cavitation generated by the injection of a fluid is positively promoted and crushing effect due to cavitation is put to practical use to markedly increase work load by injection in a liquid.
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