Jet thrusts and pressure losses of water through micro orifices and slots were measured by using an electric balance and a pressure transducer respectively. It was found that the thrusts for the orifice of 1mm order agree with the result of numerical simulation using Navier-Stokes equation, but the thrusts for the fine apertures of the order 10 μm are well below those predicted. Similarly, the experimental result indicated that the pressure losses for the orifice of 1mm order agree with the theoretical one, but those for the fine apertures of the order 10 μm significantly decrease.

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