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• W2971369728 abstract "The impact of an axisymmetric liquid jet on a flat rigid wall wet with a thin film of the same liquid is numerically studied, using the two-dimensional Euler equations with axial symmetry solved by CIP-CUP method. The main attention is paid to the film effect on the liquid pressure field and the wall pressure load for the impact velocities 150−350 m/s. Such a velocity range is important for applications related to liquid and cavitation damage and erosion. Small film thicknesses up to 1/5 of the jet radius are considered because they may result in high pressure load on the wall, comparable to that in the dry wall case. The initial most intense period of the impact is investigated. The results show that for the film thickness up to about 1/10 of the jet radius throughout the impact-velocity range considered, a pressure peak appears at the periphery of the loaded zone on the wall, which is similar to the dry wall case. For sufficiently thin films and large impact velocities, the peripheral pressure peak may exceed the water hammer pressure. With increasing the film thickness, the wall-pressure distribution becomes more uniform, the maxima of the wall pressure in the center and at the periphery of the loaded area decrease. Unlike the dry wall case, the level of the wall pressure in terms of its ratio to the water hammer pressure lowers with decreasing the impact velocity because of an increase in the curvature of the shock wave incident on the wall. Rather large negative pressures arise in a small liquid zone near the wall as the expansion wave, generated by interaction between the shock wave and the film surface, reflects from the wall. With increasing the film thickness or lowering the impact velocity, their magnitude decreases. The dependences of the maximum average and maximum local wall pressure on the film thickness and the impact velocity have been determined. The impact of the jet without allowing for its axial symmetry has also been considered. It is found that the neglect of the axial symmetry may significantly reduce the damping effect of the film. With decreasing the film thickness and increasing the impact velocity, the reduction gradually vanishes." @default.
• W2971369728 created "2019-09-12" @default.
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• W2971369728 date "2020-01-01" @default.
• W2971369728 modified "2023-09-25" @default.
• W2971369728 title "Liquid jet impact on a wet wall" @default.
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• W2971369728 doi "https://doi.org/10.1016/j.euromechflu.2019.09.001" @default.
• W2971369728 hasPublicationYear "2020" @default.
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